Threats tagged 'ghsa-rf44-j88r-hh8c'

Traefik contains a medium severity vulnerability (CVE-2026-88011) involving header aliasing that allows identity spoofing via dot-form header names. Traefik treats headers with dashes, underscores, and dots as distinct, but some backends collapse these into the same variable, enabling an attacker to bypass ForwardAuth identity assertions. This affects Traefik v1.x, v2 up to 2.11.55, and v3 from 3.0.0 to 3.7.11. The vulnerability allows a permitted lower-privilege client to impersonate another user or role. Patches are available in v2.11.56 and v3.7.12, which introduce the aliasHeadersStrategy option to mitigate the issue.