CVE-2026-109475

Microsoft Security Advisory CVE-2026-109475 - .NET Denial of Service Vulnerability

Products / packages Microsoft .NET 10.0 installed on Linux · Microsoft .NET 10.0 installed on Mac OS · Microsoft .NET 11.0 installed on Linux · 13 more

Published 10/11/2026, 18:15:22 UTC

Severity and exploitation

Not in CISA KEVSource: MODERATE

KEV coverage does not rule out exploitation.

KEV checked 14/11/2026, 23:05:32 UTC

OSV · CVSS:3.1 · 7.5

Assessment vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C

microsoft · CVSS:3.1 · 7.5

Assessment vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C

The headline uses the highest imported catalog score. Assessments can differ by source and CVSS version.

Severity

high7.5

CVSS measures technical severity, not the likelihood of an attack.

Known exploitation

Not listed in the checked CISA KEV catalog

Absence from CISA KEV does not rule out attacks.

Public exploit

Not established by this record

Missing evidence does not mean no public exploit exists.

Remediation

Package fixes recorded

Fix versions are recorded for 8 of 8 mapped packages. Check each release branch and any separate product guidance.

What this means

A denial of service vulnerability exists in .NET due to the managed HttpListener recursively processing an unterminated request line, exhausting the process stack. Affected versions include .NET 8.0 to 11.0 on Linux and macOS platforms.

Summarized by @cf/meta/llama-3.3-70b-instruct-fp8-fast. Verify details against the original sources.

Attack conditions

No attack-condition excerpt has been identified here. Review the full source description and references for authentication, network access, and configuration requirements.

Review supporting sources →

Affected versions

Check the exact model, release, and any platform requirements against your installation.

Microsoft · microsoft

.NET 10.0 installed on Linux

1 range

microsoft version evidence

Check a product version

Compare with this publisher’s ranges. This does not inspect your installation.

affected

10.0.0 → before 10.0.15

custom versions

Other versions: unknown

Microsoft · microsoft

.NET 10.0 installed on Mac OS

1 range

microsoft version evidence

Check a product version

Compare with this publisher’s ranges. This does not inspect your installation.

affected

10.0.0 → before 10.0.15

custom versions

Other versions: unknown

Microsoft · microsoft

.NET 11.0 installed on Linux

1 range

microsoft version evidence

Check a product version

Compare with this publisher’s ranges. This does not inspect your installation.

affected

11.0.0-preview.1 → before 11.0.0

custom versions

Other versions: unknown

Microsoft · microsoft

.NET 11.0 installed on Mac OS

1 range

microsoft version evidence

Check a product version

Compare with this publisher’s ranges. This does not inspect your installation.

affected

11.0.0-preview.1 → before 11.0.0

custom versions

Other versions: unknown

Microsoft · microsoft

.NET 8.0 installed on Linux

1 range

microsoft version evidence

Check a product version

Compare with this publisher’s ranges. This does not inspect your installation.

affected

8.0.0 → before 8.0.34

custom versions

Other versions: unknown

Microsoft · microsoft

.NET 8.0 installed on Mac OS

1 range

microsoft version evidence

Check a product version

Compare with this publisher’s ranges. This does not inspect your installation.

affected

8.0.0 → before 8.0.34

custom versions

Other versions: unknown

Microsoft · microsoft

.NET 9.0 installed on Linux

1 range

microsoft version evidence

Check a product version

Compare with this publisher’s ranges. This does not inspect your installation.

affected

9.0.0 → before 9.0.23

custom versions

Other versions: unknown

Microsoft · microsoft

.NET 9.0 installed on Mac OS

1 range

microsoft version evidence

Check a product version

Compare with this publisher’s ranges. This does not inspect your installation.

affected

9.0.0 → before 9.0.23

custom versions

Other versions: unknown

Packages

Compare each installed version with the publisher’s affected ranges. Where a fix is recorded, choose the appropriate release branch and test compatibility before upgrading.

Microsoft.NETCore.App.Runtime.linux-arm NuGet

Affected range	Recorded fix
From 8.0.0-0 before 8.0.34Ecosystem versions	8.0.34
From 9.0.0-0 before 9.0.23Ecosystem versions	9.0.23
From 10.0.0-0 before 10.0.15Ecosystem versions	10.0.15
From 11.0.0-preview.1.26104.118 before 11.0.0Ecosystem versions	11.0.0

Version evidence: OSV · GHSA-3g4v-f5gv-c7xf

View original version evidence (71 explicit versions)

Microsoft.NETCore.App.Runtime.linux-arm64 NuGet

Affected range	Recorded fix
From 8.0.0-0 before 8.0.34Ecosystem versions	8.0.34
From 9.0.0-0 before 9.0.23Ecosystem versions	9.0.23
From 10.0.0-0 before 10.0.15Ecosystem versions	10.0.15
From 11.0.0-preview.1.26104.118 before 11.0.0Ecosystem versions	11.0.0

Version evidence: OSV · GHSA-3g4v-f5gv-c7xf

View original version evidence (71 explicit versions)

Microsoft.NETCore.App.Runtime.linux-musl-arm NuGet

Affected range	Recorded fix
From 8.0.0-0 before 8.0.34Ecosystem versions	8.0.34
From 9.0.0-0 before 9.0.23Ecosystem versions	9.0.23
From 10.0.0-0 before 10.0.15Ecosystem versions	10.0.15
From 11.0.0-preview.1.26104.118 before 11.0.0Ecosystem versions	11.0.0

Version evidence: OSV · GHSA-3g4v-f5gv-c7xf

View original version evidence (71 explicit versions)

Microsoft.NETCore.App.Runtime.linux-musl-arm64 NuGet

Affected range	Recorded fix
From 8.0.0-0 before 8.0.34Ecosystem versions	8.0.34
From 9.0.0-0 before 9.0.23Ecosystem versions	9.0.23
From 10.0.0-0 before 10.0.15Ecosystem versions	10.0.15
From 11.0.0-preview.1.26104.118 before 11.0.0Ecosystem versions	11.0.0

Version evidence: OSV · GHSA-3g4v-f5gv-c7xf

View original version evidence (71 explicit versions)

Microsoft.NETCore.App.Runtime.linux-musl-x64 NuGet

Affected range	Recorded fix
From 8.0.0-0 before 8.0.34Ecosystem versions	8.0.34
From 9.0.0-0 before 9.0.23Ecosystem versions	9.0.23
From 10.0.0-0 before 10.0.15Ecosystem versions	10.0.15
From 11.0.0-preview.1.26104.118 before 11.0.0Ecosystem versions	11.0.0

Version evidence: OSV · GHSA-3g4v-f5gv-c7xf

View original version evidence (71 explicit versions)

Microsoft.NETCore.App.Runtime.linux-x64 NuGet

Affected range	Recorded fix
From 8.0.0-0 before 8.0.34Ecosystem versions	8.0.34
From 9.0.0-0 before 9.0.23Ecosystem versions	9.0.23
From 10.0.0-0 before 10.0.15Ecosystem versions	10.0.15
From 11.0.0-preview.1.26104.118 before 11.0.0Ecosystem versions	11.0.0

Version evidence: OSV · GHSA-3g4v-f5gv-c7xf

View original version evidence (71 explicit versions)

Microsoft.NETCore.App.Runtime.osx-arm64 NuGet

Affected range	Recorded fix
From 8.0.0-0 before 8.0.34Ecosystem versions	8.0.34
From 9.0.0-0 before 9.0.23Ecosystem versions	9.0.23
From 10.0.0-0 before 10.0.15Ecosystem versions	10.0.15
From 11.0.0-preview.1.26104.118 before 11.0.0Ecosystem versions	11.0.0

Version evidence: OSV · GHSA-3g4v-f5gv-c7xf

View original version evidence (71 explicit versions)

Microsoft.NETCore.App.Runtime.osx-x64 NuGet

Affected range	Recorded fix
From 8.0.0-0 before 8.0.34Ecosystem versions	8.0.34
From 9.0.0-0 before 9.0.23Ecosystem versions	9.0.23
From 10.0.0-0 before 10.0.15Ecosystem versions	10.0.15
From 11.0.0-preview.1.26104.118 before 11.0.0Ecosystem versions	11.0.0

Version evidence: OSV · GHSA-3g4v-f5gv-c7xf

View original version evidence (71 explicit versions)

What to do

Compare your installed product and version with the affected versions above. A matching product name alone does not confirm exposure.

Use the recorded fix for your release branch. Review the publisher’s instructions and test compatibility before upgrading.

cve.new guidance unless attributed to a publisher. This page does not inspect your installation.

Public exploit evidence

No public exploit reference is identified in the imported evidence. This is not a claim that no exploit exists.

Original source description

Read the full publisher description

Executive summary

Microsoft is releasing this security advisory to provide information about a vulnerability in .NET. This advisory provides guidance on updating affected applications and components.

Managed HttpListener can recursively process an unterminated request line and exhaust the process stack.

Announcement

Announcement for this issue can be found at https://github.com/dotnet/announcements/issues/500

CVSS Details

Version: 3.1
Severity: High
Score: 7.5 (base score)
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C
Weakness: CWE-121

Affected Platforms

Platforms: Linux, macOS
Architectures: All

<a name="affected-packages"></a>Affected Packages

The tables list affected version ranges and fixed package versions. Runtime and standalone deliveries are listed separately.

.NET 8.0 - affected runtime packages

Package	Affected version	Patched version
Microsoft.NETCore.App.Runtime.linux-arm	>= 8.0.0-0, <= 8.0.33	8.0.34
Microsoft.NETCore.App.Runtime.linux-arm64	>= 8.0.0-0, <= 8.0.33	8.0.34
Microsoft.NETCore.App.Runtime.linux-musl-arm	>= 8.0.0-0, <= 8.0.33	8.0.34
Microsoft.NETCore.App.Runtime.linux-musl-arm64	>= 8.0.0-0, <= 8.0.33	8.0.34
Microsoft.NETCore.App.Runtime.linux-musl-x64	>= 8.0.0-0, <= 8.0.33	8.0.34
Microsoft.NETCore.App.Runtime.linux-x64	>= 8.0.0-0, <= 8.0.33	8.0.34
Microsoft.NETCore.App.Runtime.osx-arm64	>= 8.0.0-0, <= 8.0.33	8.0.34
Microsoft.NETCore.App.Runtime.osx-x64	>= 8.0.0-0, <= 8.0.33	8.0.34

.NET 9.0 - affected runtime packages

Package	Affected version	Patched version
Microsoft.NETCore.App.Runtime.linux-arm	>= 9.0.0-0, <= 9.0.22	9.0.23
Microsoft.NETCore.App.Runtime.linux-arm64	>= 9.0.0-0, <= 9.0.22	9.0.23
Microsoft.NETCore.App.Runtime.linux-musl-arm	>= 9.0.0-0, <= 9.0.22	9.0.23
Microsoft.NETCore.App.Runtime.linux-musl-arm64	>= 9.0.0-0, <= 9.0.22	9.0.23
Microsoft.NETCore.App.Runtime.linux-musl-x64	>= 9.0.0-0, <= 9.0.22	9.0.23
Microsoft.NETCore.App.Runtime.linux-x64	>= 9.0.0-0, <= 9.0.22	9.0.23
Microsoft.NETCore.App.Runtime.osx-arm64	>= 9.0.0-0, <= 9.0.22	9.0.23
Microsoft.NETCore.App.Runtime.osx-x64	>= 9.0.0-0, <= 9.0.22	9.0.23

.NET 10.0 - affected runtime packages

Package	Affected version	Patched version
Microsoft.NETCore.App.Runtime.linux-arm	>= 10.0.0-0, <= 10.0.14	10.0.15
Microsoft.NETCore.App.Runtime.linux-arm64	>= 10.0.0-0, <= 10.0.14	10.0.15
Microsoft.NETCore.App.Runtime.linux-musl-arm	>= 10.0.0-0, <= 10.0.14	10.0.15
Microsoft.NETCore.App.Runtime.linux-musl-arm64	>= 10.0.0-0, <= 10.0.14	10.0.15
Microsoft.NETCore.App.Runtime.linux-musl-x64	>= 10.0.0-0, <= 10.0.14	10.0.15
Microsoft.NETCore.App.Runtime.linux-x64	>= 10.0.0-0, <= 10.0.14	10.0.15
Microsoft.NETCore.App.Runtime.osx-arm64	>= 10.0.0-0, <= 10.0.14	10.0.15
Microsoft.NETCore.App.Runtime.osx-x64	>= 10.0.0-0, <= 10.0.14	10.0.15

.NET 11.0 - affected runtime packages

Package	Affected version	Patched version
Microsoft.NETCore.App.Runtime.linux-arm	>= 11.0.0-preview.1.26104.118, <= 11.0.0-rc.3.26522.148	11.0.0
Microsoft.NETCore.App.Runtime.linux-arm64	>= 11.0.0-preview.1.26104.118, <= 11.0.0-rc.3.26522.148	11.0.0
Microsoft.NETCore.App.Runtime.linux-musl-arm	>= 11.0.0-preview.1.26104.118, <= 11.0.0-rc.3.26522.148	11.0.0
Microsoft.NETCore.App.Runtime.linux-musl-arm64	>= 11.0.0-preview.1.26104.118, <= 11.0.0-rc.3.26522.148	11.0.0
Microsoft.NETCore.App.Runtime.linux-musl-x64	>= 11.0.0-preview.1.26104.118, <= 11.0.0-rc.3.26522.148	11.0.0
Microsoft.NETCore.App.Runtime.linux-x64	>= 11.0.0-preview.1.26104.118, <= 11.0.0-rc.3.26522.148	11.0.0
Microsoft.NETCore.App.Runtime.osx-arm64	>= 11.0.0-preview.1.26104.118, <= 11.0.0-rc.3.26522.148	11.0.0
Microsoft.NETCore.App.Runtime.osx-x64	>= 11.0.0-preview.1.26104.118, <= 11.0.0-rc.3.26522.148	11.0.0

Advisory FAQ

<a name="how-affected"></a>How do I know if I am affected?

Check the deployed runtime and application package versions against the affected ranges above. Self-contained applications include their own runtime; updating a machine-wide runtime does not replace it.

<a name="how-fix"></a>How do I fix the issue?

Install the applicable runtime or update each independently referenced package to the fixed version above. Restart applications. Rebuild and redeploy self-contained applications; updating a machine-wide runtime does not replace their embedded runtime. An SDK update alone does not update an application's standalone package references.

Other Information

Reporting Security Issues

If you have found a potential security issue in a supported version of .NET, please report it to the Microsoft Security Response Center (MSRC) via the MSRC Researcher Portal. Further information can be found in the MSRC Report an Issue FAQ.

Security reports made through MSRC may qualify for the Microsoft .NET Bounty. Details of the Microsoft .NET Bounty Program including terms and conditions are at https://aka.ms/corebounty.

Support

You can ask questions about this issue on GitHub in the .NET GitHub organization. The main repos are located at https://github.com/dotnet/runtime. The Announcements repo (https://github.com/dotnet/Announcements) will contain this bulletin as an issue and will include a link to a discussion issue. You can ask questions in the linked discussion issue.

Disclaimer

The information provided in this advisory is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.

External Links

CVE-2026-109475

Acknowledgements

Rolf Zengaffinen
DEVENDRA KUMAR SINHA
Anonymous
Leandro Batista
Kevin Schmidt

Revisions

V1.0 (November 10, 2026): Advisory published.

References

14 sources

msrc.microsoft.com/update-guide/vulnerability/CVE-2026-109475

Vendor advisorymicrosoft

dotnet/runtime · security/advisories/GHSA-3g4v-f5gv-c7xf

Security advisory

nvd.nist.gov/vuln/detail/CVE-2026-109475

Security advisory

dotnet/announcements · issues/500

Source reference

dotnet/runtime · issues/137283

Source reference

dotnet/core · 10.0.15.md

Release notes

View 8 more references

dotnet/core · 11.0.0.md

Release notes

dotnet/core · 8.0.34.md

Release notes

dotnet/core · 9.0.23.md

Release notes

dotnet/runtime · repository

Source reference

dotnet/runtime · releases/tag/v10.0.15

Release notes

dotnet/runtime · releases/tag/v11.0.0

Release notes

dotnet/runtime · releases/tag/v8.0.34

Release notes

dotnet/runtime · releases/tag/v9.0.23

Release notes

Inside the record

Evidence available

Package identity

Version evidence

Remediation guidance · not supplied

Weakness classification

Additional publishers

Describes the evidence in this view, not whether the product is safe.

Original records

CVE-2026-109475

View the latest unmodified CVE JSON from the official source. It may be newer than this imported page.

cve.new JSON →

Underlying weaknesses

The source’s classification of what caused the vulnerability.

CWE-121 ↗

CWE-121: Stack-based Buffer Overflow

microsoft

Environment requirements

These conditions apply together as specified by the publisher. A matching product name alone does not establish exposure.

microsoft · platform conditions

Any condition may hold

Vulnerable product

cpe:2.3:a:microsoft:.net_10.0_installed_on_mac_os:*:*:*:*:*:*:*:*

From (inclusive): 10.0.0

After:

Through (inclusive):

Before: 10.0.15

Vulnerable product

cpe:2.3:a:microsoft:.net_11.0_installed_on_mac_os:*:*:*:*:*:*:*:*

From (inclusive): 11.0.0-preview.1

After:

Through (inclusive):

Before: 11.0.0

Vulnerable product

cpe:2.3:a:microsoft:.net_8.0_installed_on_mac_os:*:*:*:*:*:*:*:*

From (inclusive): 8.0.0

After:

Through (inclusive):

Before: 8.0.34

Vulnerable product

cpe:2.3:a:microsoft:.net_9.0_installed_on_mac_os:*:*:*:*:*:*:*:*

From (inclusive): 9.0.0

After:

Through (inclusive):

Before: 9.0.23

Vulnerable product

cpe:2.3:a:microsoft:.net_8.0_installed_on_linux:*:*:*:*:*:*:*:*

From (inclusive): 8.0.0

After:

Through (inclusive):

Before: 8.0.34

Vulnerable product

cpe:2.3:a:microsoft:.net_9.0_installed_on_linux:*:*:*:*:*:*:*:*

From (inclusive): 9.0.0

After:

Through (inclusive):

Before: 9.0.23

Vulnerable product

cpe:2.3:a:microsoft:.net_10.0_installed_on_linux:*:*:*:*:*:*:*:*

From (inclusive): 10.0.0

After:

Through (inclusive):

Before: 10.0.15

Vulnerable product

cpe:2.3:a:microsoft:.net_11.0_installed_on_linux:*:*:*:*:*:*:*:*

From (inclusive): 11.0.0-preview.1

After:

Through (inclusive):

Before: 11.0.0

Applicability preview

[
  {
    "nodes": [
      {
        "operator": "OR",
        "negate": false,
        "cpeMatch": [
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:a:microsoft:.net_10.0_installed_on_mac_os:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "10.0.0",
            "versionEndExcluding": "10.0.15"
          },
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:a:microsoft:.net_11.0_installed_on_mac_os:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "11.0.0-preview.1",
            "versionEndExcluding": "11.0.0"
          },
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:a:microsoft:.net_8.0_installed_on_mac_os:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "8.0.0",
            "versionEndExcluding": "8.0.34"
          },
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:a:microsoft:.net_9.0_installed_on_mac_os:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "9.0.0",
            "versionEndExcluding": "9.0.23"
          },
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:a:microsoft:.net_8.0_installed_on_linux:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "8.0.0",
            "versionEndExcluding": "8.0.34"
          },
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:a:microsoft:.net_9.0_installed_on_linux:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "9.0.0",
            "versionEndExcluding": "9.0.23"
          },
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:a:microsoft:.net_10.0_installed_on_linux:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "10.0.0",
            "versionEndExcluding": "10.0.15"
          },
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:a:microsoft:.net_11.0_installed_on_linux:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "11.0.0-preview.1",
            "versionEndExcluding": "11.0.0"
          }
        ]
      }
    ]
  }
]

Contributing organizations · 2

microsoft

Assigning organization

2026-11-13

CISA-ADP

Additional data publisher

2026-11-10

Timeline

All times UTC

10 Nov 2026, 18:15
Advisory published
Publication date supplied by the source.
13 Nov 2026, 18:04
Source updated
Latest modification date supplied by the source.
13 Nov 2026, 18:43
Last imported by cve.new
Latest catalog import, not the date we first saw this advisory.

What changed

Follow changes

CVE · CVE-2026-1094752026-11-11

Observed 2026-11-11T00:43:47.905Z · upstream updated 2026-11-10T23:46:48.832Z

Product or version evidence changed

before

[
  {
    "vendor": "Microsoft",
    "name": ".NET 10.0 installed on Linux",
    "platforms": [],
    "versions": [
      {
        "version": "10.0.0",
        "status": "affected",
        "lessThan": "10.0.15",
        "versionType": "custom"
      }
    ],
    "cpes": [],
    "source": "microsoft",
    "url": "https://www.cve.org/CVERecord?id=CVE-2026-109475"
  },
  {
    "vendor": "Microsoft",
    "name": ".NET 11.0 installed on Linux",
    "platforms": [],
    "versions": [
      {
        "version": "11.0.0-preview.1",
        "status": "affected",
        "lessThan": "11.0.0",
        "versionType": "custom"
      }
    ],
    "cpes": [],
    "source": "microsoft",
    "url": "https://www.cve.org/CVERecord?id=CVE-2026-109475"
  },
  {
    "vendor": "Microsoft",
    "name": ".NET 8.0 installed on Linux",
    "platforms": [],
    "versions": [
      {
        "version": "8.0.0",
        "status": "affected",
        "lessThan": "8.0.34",
        "versionType": "custom"
      }
    ],
    "cpes": [],
    "source": "microsoft",
    "url": "https://www.cve.org/CVERecord?id=CVE-2026-109475"
  },
  {
    "vendor": "Microsoft",
    "name": ".NET 9.0 installed on Linux",
    "platforms": [],
    "versions": [
      {
        "version": "9.0.0",
        "status": "affected",
        "lessThan": "9.0.23",
        "versionType": "custom"
      }
    ],
    "cpes": [],
    "source": "microsoft",
    "url": "https://www.cve.org/CVERecord?id=CVE-2026-109475"
  }
]

after

[
  {
    "vendor": "Microsoft",
    "name": ".NET 10.0 installed on Linux",
    "platforms": [],
    "versions": [
      {
        "version": "10.0.0",
        "status": "affected",
        "lessThan": "10.0.15",
        "versionType": "custom"
      }
    ],
    "cpes": [],
    "source": "microsoft",
    "url": "https://www.cve.org/CVERecord?id=CVE-2026-109475"
  },
  {
    "vendor": "Microsoft",
    "name": ".NET 10.0 installed on Mac OS",
    "platforms": [],
    "versions": [
      {
        "version": "10.0.0",
        "status": "affected",
        "lessThan": "10.0.15",
        "versionType": "custom"
      }
    ],
    "cpes": [],
    "source": "microsoft",
    "url": "https://www.cve.org/CVERecord?id=CVE-2026-109475"
  },
  {
    "vendor": "Microsoft",
    "name": ".NET 11.0 installed on Linux",
    "platforms": [],
    "versions": [
      {
        "version": "11.0.0-preview.1",
        "status": "affected",
        "lessThan": "11.0.0",
        "versionType": "custom"
      }
    ],
    "cpes": [],
    "source": "microsoft",
    "url": "https://www.cve.org/CVERecord?id=CVE-2026-109475"
  },
  {
    "vendor": "Microsoft",
    "name": ".NET 11.0 installed on Mac OS",
    "platforms": [],
    "versions": [
      {
        "version": "11.0.0-preview.1",
        "status": "affected",
        "lessThan": "11.0.0",
        "versionType": "custom"
      }
    ],
    "cpes": [],
    "source": "microsoft",
    "url": "https://www.cve.org/CVERecord?id=CVE-2026-109475"
  },
  {
    "vendor": "Microsoft",
    "name": ".NET 8.0 installed on Linux",
    "platforms": [],
    "versions": [
      {
        "version": "8.0.0",
        "status": "affected",
        "lessThan": "8.0.34",
        "versionType": "custom"
      }
    ],
    "cpes": [],
    "source": "microsoft",
    "url": "https://www.cve.org/CVERecord?id=CVE-2026-109475"
  },
  {
    "vendor": "Microsoft",
    "name": ".NET 8.0 installed on Mac OS",
    "platforms": [],
    "versions": [
      {
        "version": "8.0.0",
        "status": "affected",
        "lessThan": "8.0.34",
        "versionType": "custom"
      }
    ],
    "cpes": [],
    "source": "microsoft",
    "url": "https://www.cve.org/CVERecord?id=CVE-2026-109475"
  },
  {
    "vendor": "Microsoft",
    "name": ".NET 9.0 installed on Linux",
    "platforms": [],
    "versions": [
      {
        "version": "9.0.0",
        "status": "affected",
        "lessThan": "9.0.23",
        "versionType": "custom"
      }
    ],
    "cpes": [],
    "source": "microsoft",
    "url": "https://www.cve.org/CVERecord?id=CVE-2026-109475"
  },
  {
    "vendor": "Microsoft",
    "name": ".NET 9.0 installed on Mac OS",
    "platforms": [],
    "versions": [
      {
        "version": "9.0.0",
        "status": "affected",
        "lessThan": "9.0.23",
        "versionType": "custom"
      }
    ],
    "cpes": [],
    "source": "microsoft",
    "url": "https://www.cve.org/CVERecord?id=CVE-2026-109475"
  }
]

Environment requirements changed

before

[
  {
    "source": "microsoft",
    "statements": [
      {
        "nodes": [
          {
            "operator": "OR",
            "negate": false,
            "cpeMatch": [
              {
                "vulnerable": true,
                "criteria": "cpe:2.3:a:microsoft:.net_8.0_installed_on_linux:*:*:*:*:*:*:*:*",
                "versionStartIncluding": "8.0.0",
                "versionEndExcluding": "8.0.34"
              },
              {
                "vulnerable": true,
                "criteria": "cpe:2.3:a:microsoft:.net_9.0_installed_on_linux:*:*:*:*:*:*:*:*",
                "versionStartIncluding": "9.0.0",
                "versionEndExcluding": "9.0.23"
              },
              {
                "vulnerable": true,
                "criteria": "cpe:2.3:a:microsoft:.net_10.0_installed_on_linux:*:*:*:*:*:*:*:*",
                "versionStartIncluding": "10.0.0",
                "versionEndExcluding": "10.0.15"
              },
              {
                "vulnerable": true,
                "criteria": "cpe:2.3:a:microsoft:.net_11.0_installed_on_linux:*:*:*:*:*:*:*:*",
                "versionStartIncluding": "11.0.0-preview.1",
                "versionEndExcluding": "11.0.0"
              }
            ]
          }
        ]
      }
    ]
  }
]

after

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  {
    "source": "microsoft",
    "statements": [
      {
        "nodes": [
          {
            "operator": "OR",
            "negate": false,
            "cpeMatch": [
              {
                "vulnerable": true,
                "criteria": "cpe:2.3:a:microsoft:.net_10.0_installed_on_mac_os:*:*:*:*:*:*:*:*",
                "versionStartIncluding": "10.0.0",
                "versionEndExcluding": "10.0.15"
              },
              {
                "vulnerable": true,
                "criteria": "cpe:2.3:a:microsoft:.net_11.0_installed_on_mac_os:*:*:*:*:*:*:*:*",
                "versionStartIncluding": "11.0.0-preview.1",
                "versionEndExcluding": "11.0.0"
              },
              {
                "vulnerable": true,
                "criteria": "cpe:2.3:a:microsoft:.net_8.0_installed_on_mac_os:*:*:*:*:*:*:*:*",
                "versionStartIncluding": "8.0.0",
                "versionEndExcluding": "8.0.34"
              },
              {
                "vulnerable": true,
                "criteria": "cpe:2.3:a:microsoft:.net_9.0_installed_on_mac_os:*:*:*:*:*:*:*:*",
                "versionStartIncluding": "9.0.0",
                "versionEndExcluding": "9.0.23"
              },
              {
                "vulnerable": true,
                "criteria": "cpe:2.3:a:microsoft:.net_8.0_installed_on_linux:*:*:*:*:*:*:*:*",
                "versionStartIncluding": "8.0.0",
                "versionEndExcluding": "8.0.34"
              },
              {
                "vulnerable": true,
                "criteria": "cpe:2.3:a:microsoft:.net_9.0_installed_on_linux:*:*:*:*:*:*:*:*",
                "versionStartIncluding": "9.0.0",
                "versionEndExcluding": "9.0.23"
              },
              {
                "vulnerable": true,
                "criteria": "cpe:2.3:a:microsoft:.net_10.0_installed_on_linux:*:*:*:*:*:*:*:*",
                "versionStartIncluding": "10.0.0",
                "versionEndExcluding": "10.0.15"
              },
              {
                "vulnerable": true,
                "criteria": "cpe:2.3:a:microsoft:.net_11.0_installed_on_linux:*:*:*:*:*:*:*:*",
                "versionStartIncluding": "11.0.0-preview.1",
                "versionEndExcluding": "11.0.0"
              }
            ]
          }
        ]
      }
    ]
  }
]

CVE · CVE-2026-1094752026-11-10

Observed 2026-11-10T22:05:25.193Z · upstream updated 2026-11-10T21:51:57.417Z

Prioritization updated

before

[]

after

[
  {
    "source": "CISA-ADP",
    "type": "SSVC",
    "role": "CISA Coordinator",
    "timestamp": "2026-11-10T21:46:43.748724Z",
    "decisions": [
      {
        "name": "Exploitation",
        "value": "none"
      },
      {
        "name": "Automatable",
        "value": "yes"
      },
      {
        "name": "Technical Impact",
        "value": "partial"
      }
    ]
  }
]

Large field values are marked as truncated previews. Original source snapshots remain retained.

Showing up to 50 most recent observed changes.

Reading the signals

Severity · CVSS: Technical impact and attack conditions. The headline is the highest imported catalog score; sources may disagree.
Observed exploitation · KEV: An absent or unavailable KEV listing does not establish that exploitation has not occurred.
Predicted exploitation · EPSS: No EPSS estimate available in this record.

CISA-ADP · SSVC

CISA Coordinator · 2026-11-10

Exploitation: none
Automatable: yes
Technical Impact: partial

SSVC describes the publisher’s decision context. Your organization’s exposure and priorities may differ.

Record identifiers

Aliases: GHSA-3g4v-f5gv-c7xf

Source evidence

Request a correction or dispute

Start with the assigning organization for this record. Include the CVE ID, the disputed information, and supporting evidence. A dispute does not itself reject a record.

Find the responsible CNA →Official dispute and escalation process ↗

OSV GHSA-3g4v-f5gv-c7xf CVE CVE-2026-109475

Enrichment coverage

NVDAvailable

Checked 10/11/2026, 22:10:35 UTC

GHSANo result

Checked 10/11/2026, 22:10:34 UTC

EUVDAvailable

Checked 10/11/2026, 22:10:35 UTC

EPSSNo result

Checked 10/11/2026, 22:10:34 UTC

Additional source evidence

NVD · CVE-2026-109475

CVSS 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Checked 10/11/2026, 22:10:35 UTC

ENISA EUVD · EUVD-2026-121559

CVSS 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C

Checked 10/11/2026, 22:10:35 UTC

Sponsored by MoxsoBuild security habits with adaptive training and phishing simulations.View as JSON

Microsoft Security Advisory CVE-2026-109475 - .NET Denial of Service Vulnerability

Severity and exploitation

What this means

Attack conditions

Affected versions

.NET 10.0 installed on Linux

affected

unaffected

unknown

.NET 10.0 installed on Mac OS

affected

unaffected

unknown

.NET 11.0 installed on Linux

affected

unaffected

unknown

.NET 11.0 installed on Mac OS

affected

unaffected

unknown

.NET 8.0 installed on Linux

affected

unaffected

unknown

.NET 8.0 installed on Mac OS

affected

unaffected

unknown

.NET 9.0 installed on Linux

affected

unaffected

unknown

.NET 9.0 installed on Mac OS

affected

unaffected

unknown

Packages

What to do

Public exploit evidence

Original source description

Executive summary

Announcement

CVSS Details

Affected Platforms

<a name="affected-packages"></a>Affected Packages

.NET 8.0 - affected runtime packages

.NET 9.0 - affected runtime packages

.NET 10.0 - affected runtime packages

.NET 11.0 - affected runtime packages

Advisory FAQ

<a name="how-affected"></a>How do I know if I am affected?

<a name="how-fix"></a>How do I fix the issue?

Other Information

Reporting Security Issues

Support

Disclaimer

External Links

Acknowledgements

Revisions

References

Inside the record

Evidence available

Original records

Underlying weaknesses

Environment requirements

Timeline

Advisory published

Source updated

Last imported by cve.new

What changed