CVE-2026-35051

EUVD-2026-26426
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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
10 CRITICAL
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N
Base Score
CVSS 3.x
EPSS Score
Percentile: 16%
Affected Products (NVD)
VendorProductVersion
traefiktraefik
𝑥
< 2.11.43
traefiktraefik
3.0.0 ≤
𝑥
< 3.6.14
traefiktraefik
3.7.0:ea1
traefiktraefik
3.7.0:ea2
traefiktraefik
3.7.0:ea3
traefiktraefik
3.7.0:rc1
𝑥
= Vulnerable software versions
Common Weakness Enumeration
References
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
https://github.com/traefik/traefik/security/advisories/GHSA-6384-m2mw-rf54