CVE-2026-39858
traefik: Traefik: Authentication bypass via unsanitized alias headers
Kaynağa göre önem derecesi
Trivy'nin kendi etiketi CRITICAL. Kritik diyenler: NVD. Daha düşük diyenler: GHSA (yüksek), Red Hat (yüksek).
Açıklama
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 a high severity authentication bypass vulnerability in Traefik's ForwardAuth and snippet-based authentication middleware. Traefik's forwarded-header sanitization logic targets only canonical header names (e.g., X-Forwarded-Proto) and does not strip or normalize alias variants that use underscores instead of dashes (e.g., X_Forwarded_Proto). These unsanitized alias headers are forwarded intact to the authentication backend. When the backend normalizes underscore and dash header forms equivalently, an attacker can inject spoofed trust context — such as a trusted scheme or host — through the alias headers and bypass authentication on protected routes without valid credentials. This issue has been patched in versions 2.11.43, 3.6.14, and 3.7.0-rc.2.
Etkilenen paketler ve düzeltilmiş sürümler
| Kaynak | Paket | Düzeltildiği sürüm |
|---|---|---|
| go::GitHub Security Advisory Go | github.com/traefik/traefik, github.com/traefik/traefik/v2, github.com/traefik/traefik/v3 | 2.11.43 ve 1 tane daha |
| minimos | traefik-3, traefik-fips-3 | 3.6.14-r0 |
| rapidfort alpine 3.20 | traefik | 3.7.0-r0 |
| rapidfort alpine 3.21 | traefik | 3.7.0-r0 |
| rapidfort alpine 3.22 | traefik | 3.7.0-r0 |
| rapidfort alpine 3.23 | traefik | 3.7.0-r0 |
6 kaynaktaki 9 kaydın hepsini göster
| Kaynak | Paket | Düzeltildiği sürüm |
|---|---|---|
| go::GitHub Security Advisory Go | github.com/traefik/traefik | düzeltme belirtilmemiş |
| go::GitHub Security Advisory Go | github.com/traefik/traefik/v2 | 2.11.43 |
| go::GitHub Security Advisory Go | github.com/traefik/traefik/v3 | 3.7.0-rc.2, 3.6.14 |
| minimos | traefik-3 | 3.6.14-r0 |
| minimos | traefik-fips-3 | 3.6.14-r0 |
| rapidfort alpine 3.20 | traefik | 3.7.0-r0 |
| rapidfort alpine 3.21 | traefik | 3.7.0-r0 |
| rapidfort alpine 3.22 | traefik | 3.7.0-r0 |
| rapidfort alpine 3.23 | traefik | 3.7.0-r0 |
Referanslar
- https://access.redhat.com/errata/RHSA-2026:21772
- https://access.redhat.com/security/cve/CVE-2026-39858
- https://bugzilla.redhat.com/show_bug.cgi?id=2464234
- https://github.com/traefik/traefik
- 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-5m6w-wvh7-57vm