Skip to content
Patch Next
Sign inAdd to your agent

← Actionable
Medium, CVSS 5.3amended

Traefik CRD IngressRouteTCP ServersTransport Cross-Provider Namespace Bypass

CVE-2026-65602GHSA-42cj-m3vj-89wv

What to do

Partial vendor fix. Follow the primary source's mitigation guidance and check back for a fix.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

Add to your agent

Affected packages

  • Go github.com/traefik/traefik/v3

    Affected
    >= 3.6.0, <= 3.6.22>= 3.7.0, <= 3.7.6
    Fixed in
    3.7.7, 3.6.23

  • Go github.com/traefik/traefik/v2

    Affected
    every version
    Fixed in
    no fixed version recorded

  • Go github.com/traefik/traefik

    Affected
    every version
    Fixed in
    no fixed version recorded

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS 4.0
5.3 · CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N · score source
EPSS
  • CVE-2026-65602: 0.33% estimated exploitation activity in the next 30 days; percentile 26.56 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

Summary There is a medium-severity cross-provider reference vulnerability in Traefik's Kubernetes CRD provider. The crossProviderNamespaces allowlist is enforced for HTTP serversTransport references but was not enforced for IngressRouteTCP service serversTransport references. A low-privileged Kubernetes user in a namespace that is not listed in crossProviderNamespaces could set serversTransport: foo@file on an IngressRouteTCP service, causing Traefik to accept the forbidden cross-provider reference and use the file-provider TCPServersTransport — including privileged backend mTLS client certificates, SPIFFE identity, or PROXY-protocol settings. The fix applies the crossProviderNamespaces allowlist to TCP serversTransport references. Patches - https://github.com/traefik/traefik/releases/tag/v3.6.23 - https://github.com/traefik/traefik/releases/tag/v3.7.7 For more information If you have any questions or comments about this advisory, please open an issue. <details <summaryOriginal…

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 4 · amended ·

    Amended from ghsa record GHSA-42cj-m3vj-89wv

  2. Revision 3 · amended ·

    Reviewed OSV alias/range/CVSS4 correction; package source scopes and original publication preserved. No customer finding resolved.

  3. Revision 2 · amended ·

    Amended from osv record GO-2026-6192

  4. Revision 1 · created ·

    Published from osv record GHSA-42cj-m3vj-89wv

Agent brief

Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.

# Patch Next advisory brief: CVE-2026-65602

Advisory: Traefik CRD IngressRouteTCP ServersTransport Cross-Provider Namespace Bypass
IDs: CVE-2026-65602, GHSA-42cj-m3vj-89wv
Record: https://patchnext.com/advisories/cve-2026-65602 (revision 4, source checked 26 Oct 2026, 15:28 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 5.3)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Partial vendor fix; fixed versions by package: github.com/traefik/traefik/v3 3.7.7, 3.6.23. A vendor fix does not mean a deployment is fixed.

## Affected components
- Go github.com/traefik/traefik/v3: affected >= 3.6.0, <= 3.6.22; >= 3.7.0, <= 3.7.6; fixed in 3.7.7, 3.6.23
- Go github.com/traefik/traefik/v2: affected every version
- Go github.com/traefik/traefik: affected every version

## Suggested inspection (read-only)
- Go github.com/traefik/traefik/v3: check the installed version with your package manager.
- Go github.com/traefik/traefik/v2: check the installed version with your package manager.
- Go github.com/traefik/traefik: check the installed version with your package manager.

## Supported action
No complete vendor fix is recorded. Follow the primary source's mitigation guidance and check this record again before closing anything.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on github.com/traefik/traefik/v3, github.com/traefik/traefik/v2, github.com/traefik/traefik.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-42cj-m3vj-89wv (OSV record GHSA-42cj-m3vj-89wv lists affected ranges: Go github.com/traefik/traefik/v3 >=3.6.0 =3.7.0 <3.7.7 (fixed))
- Verified: https://osv.dev/vulnerability/GO-2026-6192 (OSV record GO-2026-6192 lists affected ranges: Go github.com/traefik/traefik >=0; Go github.com/traefik/traefik/v2 >=0; Go github.com/traefik/traefik/v3 >=3.6.0 =3.7.0 <3.7.7 (fixed))
- Verified: https://github.com/advisories/GHSA-42cj-m3vj-89wv (GitHub-reviewed advisory GHSA-42cj-m3vj-89wv lists affected ranges: Go github.com/traefik/traefik/v3 >=3.6.0 =3.7.0 <=3.7.6)

Commands are suggestions: review each one before running it.

Loading voting…