Vulnerability details
CVE-2026-88009
traefik traefik
Traefik: Rootless HTTP/1 request-target routes as "/" but is forwarded verbatim, bypassing path-scoped routing, middleware guards and access logging
CVSS 4.0
8.8High
Official description
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.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 8.8High | 4.0 | CVEProject cvelistV5 (CNA) (GitHub_M) | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| traefik | traefik | < 2.11.57 | CVEProject cvelistV5 (CNA) |
| traefik | traefik | >= 3.0.0, < 3.7.13 | CVEProject cvelistV5 (CNA) |
References and advisories
5- https://github.com/traefik/traefik/security/advisories/GHSA-f52w-8j3h-j724 x_refsource_CONFIRM
- https://github.com/traefik/traefik/pull/13796 x_refsource_MISC
- https://github.com/traefik/traefik/commit/58d1e9ca204526823211e30fd4634101c59d58e9 x_refsource_MISC
- https://github.com/traefik/traefik/releases/tag/v2.11.57 x_refsource_MISC
- https://github.com/traefik/traefik/releases/tag/v3.7.13 x_refsource_MISC
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Details
- Published
- 2026-09-10
- Last updated
- 2026-09-10
- State
- Published
- Assigner (CNA)
- GitHub_M
Exploit prediction (EPSS)
0.44%
Probability of exploitation in 30 days
38.7%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- Yes
- Exploitation
- None
- Technical impact
- Partial
Weaknesses (CWE)
- CWE-444Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
- CWE-1286Improper Validation of Syntactic Correctness of Input