CVSS 4.0
5.3 mediumCVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:NCVE-2026-88011
Medium (5.3) in traefik traefik. EPSS 0.4% chance of exploitation in the next 30 days. Fixed in github.com/traefik/traefik/v2 2.11.56.
Traefik is an open source HTTP reverse proxy and load balancer. Prior to 2.11.56, and from 3.0.0 until 3.7.12, a client-supplied dot-form header such as X.Authenticated.User survives ForwardAuth replacement and underscoreHeadersStrategy because Go treats it as distinct from X-Authenticated-User while normalization-prone CGI, WSGI, PHP, and NGINX backends collapse both names. A backend can consequently consume the client value instead of the identity Traefik asserted, allowing identity spoofing for any header managed by Traefik. The aliasHeadersStrategy protection is disabled by default and must be configured as delete or reject. The mitigation is available in 2.11.56 and 3.7.12.
Severity
CVSS 3.1
8.1 highCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N- EPSS
- 0.4% chance of exploitation in the next 30 days; higher than 36% of CVEs (scores of 2026-10-31)
- CWE
- CWE-290
- Published
- Modified
- Record from
- the NVD, synced
Affected
- traefik:traefik
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-rf44-j88r-hh8c | Go | github.com/traefik/traefik/v2 | <2.11.56 | 2.11.56 |
| GHSA-rf44-j88r-hh8c | Go | github.com/traefik/traefik/v3 | >=3.0.0 <3.7.12 | 3.7.12 |
| GO-2026-6455 | Go | github.com/traefik/traefik | all versions | no fix published |
| GO-2026-6455 | Go | github.com/traefik/traefik/v2 | <2.11.56 | 2.11.56 |
| GO-2026-6455 | Go | github.com/traefik/traefik/v3 | >=3.0.0 <3.7.12 | 3.7.12 |
References
- https://github.com/traefik/traefik/commit/0331801c72329e0eaeb850e53ccce87c57fbecf8
- https://github.com/traefik/traefik/pull/13720
- https://github.com/traefik/traefik/releases/tag/v2.11.56
- https://github.com/traefik/traefik/releases/tag/v3.7.12
- https://github.com/traefik/traefik/security/advisories/GHSA-rf44-j88r-hh8c