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CVE-2026-45109

Next.js: Middleware / Proxy bypass in App Router applications via segment-prefetch routes

Products / packages vercel next.js · Red Hat Streams for Apache Kafka 2.9.4 · Red Hat Trusted Artifact Signer 1.3 · 8 more

Published

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Severity and exploitation

Not in CISA KEVSource: HIGH

KEV coverage does not rule out exploitation.

KEV checked 15/11/2026, 02:40:44 UTC
GitHub_M · CVSS:3.1 · 7.5
Assessment vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
redhat-SADP · CVSS:3.1 · 7.5
Assessment vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
OSV · CVSS:3.1 · 7.5
Assessment vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
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 1 of 1 mapped packages. Check each release branch and any separate product guidance.

What this means

It was found that the fix addressing CVE-2026-44575 did not apply to middleware.ts with Turbopack. Refer to CVE-2026-44575 for further details.

Source excerpt · OSV

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.

vercel · GitHub_M

next.js

2 ranges
GitHub_M version evidence

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

affected

>= 15.2.0, < 15.5.17

>= 16.0.0, < 16.2.6

unaffected

unknown

Other versions: unknown

Red Hat · redhat-SADP

Streams for Apache Kafka 2.9.4

0 ranges
redhat-SADP version evidence

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

affected

unaffected

unknown

Other versions: unaffected

Product identifiers (CPE)cpe:/a:redhat:amq_streams:2.9::el9

Red Hat · redhat-SADP

Red Hat Trusted Artifact Signer 1.3

1 range
redhat-SADP version evidence

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

affected

unaffected

1783958622 → before *

rpm versions

unknown

Other versions: affected

Product identifiers (CPE)cpe:/a:redhat:trusted_artifact_signer:1.3::el9

Red Hat · redhat-SADP

Red Hat Trusted Artifact Signer 1.4

1 range
redhat-SADP version evidence

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

affected

unaffected

1783327185 → before *

rpm versions

unknown

Other versions: affected

Product identifiers (CPE)cpe:/a:redhat:trusted_artifact_signer:1.4::el9

Red Hat · redhat-SADP

Red Hat Enterprise Linux 10

0 ranges
redhat-SADP version evidence

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

affected

unaffected

unknown

Other versions: unaffected

Product identifiers (CPE)cpe:/o:redhat:enterprise_linux:10

Red Hat · redhat-SADP

Red Hat Enterprise Linux 10

0 ranges
redhat-SADP version evidence

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

affected

unaffected

unknown

Other versions: unaffected

Product identifiers (CPE)cpe:/o:redhat:enterprise_linux:10

Red Hat · redhat-SADP

Red Hat Enterprise Linux 7

0 ranges
redhat-SADP version evidence

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

affected

unaffected

unknown

Other versions: unaffected

Product identifiers (CPE)cpe:/o:redhat:enterprise_linux:7

Red Hat · redhat-SADP

Red Hat Enterprise Linux 8

0 ranges
redhat-SADP version evidence

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

affected

unaffected

unknown

Other versions: unaffected

Product identifiers (CPE)cpe:/o:redhat:enterprise_linux:8

Red Hat · redhat-SADP

Red Hat Enterprise Linux 8

0 ranges
redhat-SADP version evidence

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

affected

unaffected

unknown

Other versions: unaffected

Product identifiers (CPE)cpe:/o:redhat:enterprise_linux:8

Red Hat · redhat-SADP

Red Hat Enterprise Linux 9

0 ranges
redhat-SADP version evidence

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

affected

unaffected

unknown

Other versions: unaffected

Product identifiers (CPE)cpe:/o:redhat:enterprise_linux:9

Red Hat · redhat-SADP

Red Hat Enterprise Linux 9

0 ranges
redhat-SADP version evidence

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

affected

unaffected

unknown

Other versions: unaffected

Product identifiers (CPE)cpe:/o:redhat:enterprise_linux:9

Red Hat · redhat-SADP

Red Hat Enterprise Linux AI (RHEL AI) 3

0 ranges
redhat-SADP version evidence

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

affected

unaffected

unknown

Other versions: affected

Product identifiers (CPE)cpe:/a:redhat:enterprise_linux_ai:3

Red Hat · redhat-SADP

Red Hat Enterprise Linux AI (RHEL AI) 3

0 ranges
redhat-SADP version evidence

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

affected

unaffected

unknown

Other versions: affected

Product identifiers (CPE)cpe:/a:redhat:enterprise_linux_ai:3

Red Hat · redhat-SADP

Red Hat Enterprise Linux AI (RHEL AI) 3

0 ranges
redhat-SADP version evidence

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

affected

unaffected

unknown

Other versions: affected

Product identifiers (CPE)cpe:/a:redhat:enterprise_linux_ai:3

Red Hat · redhat-SADP

Red Hat Enterprise Linux AI (RHEL AI) 3

0 ranges
redhat-SADP version evidence

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

affected

unaffected

unknown

Other versions: affected

Product identifiers (CPE)cpe:/a:redhat:enterprise_linux_ai:3

Red Hat · redhat-SADP

streams for Apache Kafka 3

0 ranges
redhat-SADP version evidence

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

affected

unaffected

unknown

Other versions: affected

Product identifiers (CPE)cpe:/a:redhat:amq_streams:3

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.

next npm
Affected range Recorded fix
From 15.2.0 before 15.5.18Semantic versions15.5.18
From 16.0.0 before 16.2.6Semantic versions16.2.6

Version evidence: OSV · GHSA-26hh-7cqf-hhc6

View original version evidence (0 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.

RHSA-2026:40974: Red Hat Trusted Artifact Signer 1.3

redhat-SADP guidance ↗

RHSA-2026:37272: Red Hat Trusted Artifact Signer 1.4

redhat-SADP guidance ↗

RHSA-2026:34608: Streams for Apache Kafka 2.9.4

redhat-SADP guidance ↗

RHSA-2026:54435: Streams for Apache Kafka 3.2.1

redhat-SADP guidance ↗

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.

redhat-SADP 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

Impact

It was found that the fix addressing CVE-2026-44575 did not apply to middleware.ts with Turbopack. Refer to CVE-2026-44575 for further details.

References

References

14 sources
access.redhat.com/errata/RHSA-2026:40974
Vendor advisoryredhat-SADP
access.redhat.com/errata/RHSA-2026:37272
Vendor advisoryredhat-SADP
access.redhat.com/errata/RHSA-2026:34608
Vendor advisoryredhat-SADP
access.redhat.com/errata/RHSA-2026:54435
Vendor advisoryredhat-SADP
vercel/next.js · security/advisories/GHSA-26hh-7cqf-hhc6
Security advisoryGitHub_M
vercel/next.js · security/advisories/GHSA-267c-6grr-h53f
Security advisoryGitHub_M
View 8 more references
vercel/next.js · releases/tag/v15.5.18
Release notesGitHub_M
vercel/next.js · releases/tag/v16.2.6
Release notesGitHub_M
vercel.com/changelog/next-js-may-2026-security-release
Release notesGitHub_M
access.redhat.com/security/cve/CVE-2026-45109
Security advisoryredhat-SADP
bugzilla.redhat.com/show_bug.cgi
Source referenceredhat-SADP
security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-45109.json
Security advisoryredhat-SADP
nvd.nist.gov/vuln/detail/CVE-2026-45109
Security advisory
vercel/next.js · repository
Source reference

Inside the record

Evidence available

Package identity
Version evidence
Remediation guidance
Weakness classification
Additional publishers

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

Original records

CVE-2026-45109

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-288 ↗

CWE-288: Authentication Bypass Using an Alternate Path or Channel

GitHub_M

Related →
CWE-358 ↗

Improperly Implemented Security Check for Standard

redhat-SADP

Related →
Contributing organizations · 3
GitHub_M

Assigning organization

2026-11-04
CISA-ADP

Additional data publisher

2026-05-13
redhat-SADP

Additional data publisher

2026-08-13

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
No substantive changes have been recorded here yet. History starts when cve.new observes a change after tracking is enabled; earlier edits are not reconstructed.

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