Investigate in your agent.

Turn this advisory into a focused investigation. Ask your agent to check your project’s versions, explain the evidence, and suggest a compatible fix.

Your agent needs remote MCP support and access to https://cve.new/mcp.

Read the setup guide

Skip to content
cve.newCreate a CVE report
Check your stack
CVE-2026-118745

Microsoft Security Advisory CVE-2026-118745 - Visual Studio Remote Code Execution Vulnerability

Products / packages Microsoft .NET 10.0 installed on Windows · Microsoft .NET 11.0 installed on Windows · Microsoft .NET 8.0 installed on Windows · 6 more

Published

Share

Severity and exploitation

Not in CISA KEVSource: HIGH

KEV coverage does not rule out exploitation.

KEV checked 14/11/2026, 22:55:31 UTC
OSV · CVSS:3.1 · 8.8
Assessment vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
microsoft · CVSS:3.1 · 8.8
Assessment vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/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

high8.8

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 3 of 3 mapped packages. Check each release branch and any separate product guidance.

What this means

A heap out-of-bounds write vulnerability exists in Microsoft.DiaSymReader.Native when reading crafted native PDBs. Affected versions include .NET 8.0 to 11.0 installed on Windows, with various patched versions available.

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 Windows

1 range
microsoft version evidence

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

affected

10.0.0 → before 10.0.15

custom versions

unaffected

unknown

Other versions: unknown

Microsoft · microsoft

.NET 11.0 installed on Windows

1 range
microsoft version evidence

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

affected

11.0.0-preview.1 → before 11.0.0

custom versions

unaffected

unknown

Other versions: unknown

Microsoft · microsoft

.NET 8.0 installed on Windows

1 range
microsoft version evidence

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

affected

8.0.0 → before 8.0.34

custom versions

unaffected

unknown

Other versions: unknown

Microsoft · microsoft

.NET 9.0 installed on Windows

1 range
microsoft version evidence

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

affected

9.0.0 → before 9.0.23

custom versions

unaffected

unknown

Other versions: unknown

Microsoft · microsoft

Microsoft Visual Studio 2026 version 18.11

1 range
microsoft version evidence

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

affected

18.11.0 → before 18.11.4

custom versions

unaffected

unknown

Other versions: unknown

Microsoft · microsoft

Microsoft Visual Studio 2026 version 18.12

1 range
microsoft version evidence

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

affected

18.12.0 → before 18.12.0

custom versions

unaffected

unknown

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.win-x86 NuGet
Affected range Recorded fix
From 8.0.0 before 8.0.34Ecosystem versions8.0.34
From 9.0.0 before 9.0.23Ecosystem versions9.0.23
From 10.0.0 before 10.0.15Ecosystem versions10.0.15
From 11.0.0-preview.1 before 11.0.0Ecosystem versions11.0.0

Version evidence: OSV · GHSA-x8x8-p968-x646

View original version evidence (71 explicit versions)
Microsoft.NETCore.App.Runtime.win-x64 NuGet
Affected range Recorded fix
From 8.0.0 before 8.0.34Ecosystem versions8.0.34
From 9.0.0 before 9.0.23Ecosystem versions9.0.23
From 10.0.0 before 10.0.15Ecosystem versions10.0.15
From 11.0.0-preview.1 before 11.0.0Ecosystem versions11.0.0

Version evidence: OSV · GHSA-x8x8-p968-x646

View original version evidence (71 explicit versions)
Microsoft.NETCore.App.Runtime.win-arm64 NuGet
Affected range Recorded fix
From 8.0.0 before 8.0.34Ecosystem versions8.0.34
From 9.0.0 before 9.0.23Ecosystem versions9.0.23
From 10.0.0 before 10.0.15Ecosystem versions10.0.15
From 11.0.0-preview.1 before 11.0.0Ecosystem versions11.0.0

Version evidence: OSV · GHSA-x8x8-p968-x646

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.

Update affected .NET installations and each installed SDK feature band to the versions listed above or later.

OSV guidance ↗

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.

Crafted PDB line metadata can exceed the caller-provided buffer and cause a heap out-of-bounds write.

CVSS Details

  • Version: 3.1
  • Severity: High
  • Score: 8.8 (base score)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
  • Weakness: CWE-122

Affected Platforms

  • Platforms: Windows
  • Architectures: x86, x64, Arm64

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

On Windows x86, x64, and Arm64, Microsoft.DiaSymReader.Native versions earlier than 18.9.1-beta1.26515.1 are affected when reading crafted native PDBs.

.NET on Windows

Product Affected version Patched version
.NET 8.0 installed on Windows >= 8.0.0, < 8.0.34 8.0.34
.NET 9.0 installed on Windows >= 9.0.0, < 9.0.23 9.0.23
.NET 10.0 installed on Windows >= 10.0.0, < 10.0.15 10.0.15
.NET 11.0 installed on Windows >= 11.0.0-preview.1, < 11.0.0 11.0.0

Windows self-contained runtime packs

These runtime packs deliver the .NET runtime for Windows self-contained applications.

Package Affected version Patched version
Microsoft.NETCore.App.Runtime.win-x86 >= 8.0.0, < 8.0.34 8.0.34
Microsoft.NETCore.App.Runtime.win-x64 >= 8.0.0, < 8.0.34 8.0.34
Microsoft.NETCore.App.Runtime.win-arm64 >= 8.0.0, < 8.0.34 8.0.34
Microsoft.NETCore.App.Runtime.win-x86 >= 9.0.0, < 9.0.23 9.0.23
Microsoft.NETCore.App.Runtime.win-x64 >= 9.0.0, < 9.0.23 9.0.23
Microsoft.NETCore.App.Runtime.win-arm64 >= 9.0.0, < 9.0.23 9.0.23
Microsoft.NETCore.App.Runtime.win-x86 >= 10.0.0, < 10.0.15 10.0.15
Microsoft.NETCore.App.Runtime.win-x64 >= 10.0.0, < 10.0.15 10.0.15
Microsoft.NETCore.App.Runtime.win-arm64 >= 10.0.0, < 10.0.15 10.0.15
Microsoft.NETCore.App.Runtime.win-x86 >= 11.0.0-preview.1, < 11.0.0 11.0.0
Microsoft.NETCore.App.Runtime.win-x64 >= 11.0.0-preview.1, < 11.0.0 11.0.0
Microsoft.NETCore.App.Runtime.win-arm64 >= 11.0.0-preview.1, < 11.0.0 11.0.0

Windows SDK distributions

These Windows SDK distributions are affected through their bundled .NET runtime.

Product Affected version Patched version
.NET SDK 8.0.1xx >= 8.0.100-0, < 8.0.134 8.0.134
.NET SDK 8.0.4xx >= 8.0.400-0, < 8.0.428 8.0.428
.NET SDK 9.0.1xx >= 9.0.100-0, < 9.0.124 9.0.124
.NET SDK 9.0.3xx >= 9.0.300-0, < 9.0.321 9.0.321
.NET SDK 10.0.1xx >= 10.0.100-0, < 10.0.115 10.0.115
.NET SDK 10.0.4xx >= 10.0.400-0, < 10.0.404 10.0.404
.NET SDK 11.0.1xx >= 11.0.100-preview.1, < 11.0.100 11.0.100

Windows SDK updates

Update each installed SDK feature band to the following version or later:

  • .NET SDK 8.0.1xx: 8.0.134
  • .NET SDK 8.0.4xx: 8.0.428
  • .NET SDK 9.0.1xx: 9.0.124
  • .NET SDK 9.0.3xx: 9.0.321
  • .NET SDK 10.0.1xx: 10.0.115
  • .NET SDK 10.0.4xx: 10.0.404
  • .NET SDK 11.0.1xx: 11.0.100

Advisory FAQ

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

Applications using Microsoft.DiaSymReader.Native versions earlier than 18.9.1-beta1.26515.1 on Windows x86, x64, and Arm64 to read crafted native PDBs are exposed. See [affected packages](#affected-packages) for the affected .NET products on Windows.

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

Update affected .NET installations and each installed SDK feature band to the versions listed above or later. If an SDK was installed through Visual Studio, update Visual Studio as well.

Microsoft.DiaSymReader.Native is delivered through .NET Core rather than as a standalone customer NuGet update. For applications that deploy their own affected .NET runtime, including self-contained applications, update the runtime used to build the application, rebuild, and redeploy. Updating a machine-wide runtime does not replace an application's embedded runtime. Restart processes that have loaded the affected native reader.

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.

Announcement

https://github.com/dotnet/announcements/issues/524

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-2026-118745

Acknowledgements

  • Quac Tran

Revisions

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

References

15 sources
msrc.microsoft.com/update-guide/vulnerability/CVE-2026-118745
Vendor advisorymicrosoft
dotnet/runtime · security/advisories/GHSA-x8x8-p968-x646
Security advisory
nvd.nist.gov/vuln/detail/CVE-2026-118745
Security advisory
dotnet/announcements · issues/498
Source reference
dotnet/announcements · issues/524
Source reference
dotnet/runtime · issues/137280
Source reference
View 9 more references
dotnet/core · 10.0.15.md
Release notes
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-2026-118745

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-122 ↗

CWE-122: Heap-based Buffer Overflow

microsoft

Related →

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_8.0_installed_on_windows:*:*:*:*:*:*:*:*

From (inclusive): 8.0.0

Before: 8.0.34

Vulnerable product

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

From (inclusive): 9.0.0

Before: 9.0.23

Vulnerable product

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

From (inclusive): 10.0.0

Before: 10.0.15

Vulnerable product

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

From (inclusive): 11.0.0-preview.1

Before: 11.0.0

Vulnerable product

cpe:2.3:a:microsoft:microsoft_visual_studio_2026_version_18.11:*:*:*:*:*:*:*:*

From (inclusive): 18.11.0

Before: 18.11.4

Vulnerable product

cpe:2.3:a:microsoft:microsoft_visual_studio_2026_version_18.12:*:*:*:*:*:*:*:*

From (inclusive): 18.12.0

Before: 18.12.0

Applicability preview
[
  {
    "nodes": [
      {
        "operator": "OR",
        "negate": false,
        "cpeMatch": [
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:a:microsoft:.net_8.0_installed_on_windows:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "8.0.0",
            "versionEndExcluding": "8.0.34"
          },
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:a:microsoft:.net_9.0_installed_on_windows:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "9.0.0",
            "versionEndExcluding": "9.0.23"
          },
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:a:microsoft:.net_10.0_installed_on_windows:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "10.0.0",
            "versionEndExcluding": "10.0.15"
          },
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:a:microsoft:.net_11.0_installed_on_windows:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "11.0.0-preview.1",
            "versionEndExcluding": "11.0.0"
          },
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:a:microsoft:microsoft_visual_studio_2026_version_18.11:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "18.11.0",
            "versionEndExcluding": "18.11.4"
          },
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:a:microsoft:microsoft_visual_studio_2026_version_18.12:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "18.12.0",
            "versionEndExcluding": "18.12.0"
          }
        ]
      }
    ]
  }
]
Contributing organizations · 2
microsoft

Assigning organization

2026-11-13
CISA-ADP

Additional data publisher

2026-11-10

Timeline

All times UTC

  1. Advisory published

    Publication date supplied by the source.

  2. Source updated

    Latest modification date supplied by the source.

  3. Last imported by cve.new

    Latest catalog import, not the date we first saw this advisory.

What changed

Follow changes
  1. CVE · CVE-2026-118745

    Observed 2026-11-10T20:27:58.809Z · upstream updated 2026-11-10T19:42:07.295Z

    Prioritization updated

    before

    []

    after

    [
  {
    "source": "CISA-ADP",
    "type": "SSVC",
    "role": "CISA Coordinator",
    "timestamp": "2026-11-10T19:28:37.674905Z",
    "decisions": [
      {
        "name": "Exploitation",
        "value": "none"
      },
      {
        "name": "Automatable",
        "value": "no"
      },
      {
        "name": "Technical Impact",
        "value": "total"
      }
    ]
  }
]

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

Showing up to 50 most recent observed changes.