CVE-2026-35051

Summary

Traefik is an HTTP reverse proxy and load balancer. Prior to versions 2.11.43, 3.6.14, and 3.7.0-rc.2, there is an authentication bypass vulnerability in Traefik's ForwardAuth middleware when trustForwardHeader=false is configured and Traefik is deployed behind a trusted upstream proxy. This issue has been patched in versions 2.11.43, 3.6.14, and 3.7.0-rc.2.

Affected Software

Weaknesses

• CWE-345: CWE-345: Insufficient Verification of Data Authenticity

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: yes
  • Technical Impact: total

Traefik: github.com/traefik/traefik: Traefik: Authentication bypass in ForwardAuth middleware

Additional References

• https://access.redhat.com/security/cve/CVE-2026-35051
• https://bugzilla.redhat.com/show_bug.cgi?id=2464235
• https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-35051.json
• https://access.redhat.com/errata/RHSA-2026:21772

References

• https://github.com/traefik/traefik/security/advisories/GHSA-6384-m2mw-rf54
• https://github.com/traefik/traefik/releases/tag/v2.11.43
• https://github.com/traefik/traefik/releases/tag/v3.6.14
• https://github.com/traefik/traefik/releases/tag/v3.7.0-rc.2

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