CVSS 4.0
8.8 highCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:NCVE-2026-88009
High (8.8) in traefik traefik. EPSS 0.4% chance of exploitation in the next 30 days. Fixed in github.com/traefik/traefik/v3 3.7.13.
Traefik is an open source HTTP reverse proxy and load balancer. Prior to 2.11.57, and 3.7.13, Traefik accepts a rootless HTTP/1 request target that Go stores in URL.Opaque while leaving URL.Path empty. The rewriteRequestBuilder path evaluates routing, path sanitization, forwardAuth, encodedCharacters, and access logging against a path normalized to / but forwards URL.Opaque verbatim to the backend, allowing cross-vhost routing bypass, path-scoped authorization bypass, and access-log evasion when the backend interprets the opaque target as a path. This issue is fixed in 2.11.57 and 3.7.13.
Severity
CVSS 3.1
8.2 highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N- EPSS
- 0.4% chance of exploitation in the next 30 days; higher than 38% of CVEs (scores of 2026-10-31)
- CWEs
- CWE-444, CWE-1286
- Published
- Modified
- Record from
- the NVD, synced
Affected
- traefik:traefik
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-f52w-8j3h-j724 | Go | github.com/traefik/traefik/v3 | >=3.0.0 <3.7.13 | 3.7.13 |
| GHSA-f52w-8j3h-j724 | Go | github.com/traefik/traefik/v2 | <2.11.57 | 2.11.57 |
| GO-2026-6465 | Go | github.com/traefik/traefik | all versions | no fix published |
| GO-2026-6465 | Go | github.com/traefik/traefik/v2 | <2.11.57 | 2.11.57 |
| GO-2026-6465 | Go | github.com/traefik/traefik/v3 | >=3.0.0 <3.7.13 | 3.7.13 |
References
- https://github.com/traefik/traefik/commit/58d1e9ca204526823211e30fd4634101c59d58e9
- https://github.com/traefik/traefik/pull/13796
- https://github.com/traefik/traefik/releases/tag/v2.11.57
- https://github.com/traefik/traefik/releases/tag/v3.7.13
- https://github.com/traefik/traefik/security/advisories/GHSA-f52w-8j3h-j724