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GO-2026-6211
Traefik: Incomplete fix for CVE-2026-33433 + CVE-2026-39858 cross-cohort: headerField underscore-variant identity spoofing in BasicAuth / DigestAuth / ForwardAuth in github.com/traefik/traefik
Quick fix
GO-2026-6211 — github.com/traefik/traefik/v2: upgrade to the fixed version with the command below.
go get github.com/traefik/traefik/v2@v2.11.51Details
Traefik: Incomplete fix for CVE-2026-33433 + CVE-2026-39858 cross-cohort: headerField underscore-variant identity spoofing in BasicAuth / DigestAuth / ForwardAuth in github.com/traefik/traefik
Are you affected?
Enter the version of the package you're using.
Affected packages
Go/github.com/traefik/traefik
Introduced in:
0No fixed version published yet for github.com/traefik/traefik (go modules). Pin to a known-safe version or switch to an alternative.
Go/github.com/traefik/traefik/v2
Introduced in:
0Fixed in: 2.11.51Fix
go get github.com/traefik/traefik/v2@v2.11.51Go/github.com/traefik/traefik/v3
Introduced in:
0Fixed in: 3.6.22Fix
go get github.com/traefik/traefik/v3@v3.6.22References
- https://github.com/traefik/traefik/security/advisories/GHSA-x677-9fxg-v5c5[ADVISORY]
- https://nvd.nist.gov/vuln/detail/CVE-2026-54763[ADVISORY]
- https://github.com/traefik/traefik/commit/108a5264473a2cbc8f12d6d691a3c6553cdf2c1b[FIX]
- https://github.com/traefik/traefik/pull/13262[FIX]
- https://github.com/traefik/traefik/releases/tag/v2.11.51[WEB]
- https://github.com/traefik/traefik/releases/tag/v3.6.22[WEB]
- https://github.com/traefik/traefik/releases/tag/v3.7.6[WEB]