CVE-2026-88009Traefik: Rootless HTTP/1 request-target routes as "/" but is forwarded verbatim, bypassing path-scoped routing, middleware guards and access logging
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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
- 8.8 HIGH (v4.0, CNA)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
- Weakness (CWE)
- CWE-444, CWE-1286
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- GitHub_M
- NVD analysis
- Analyzed
- Record last updated
- Sep 10, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
traefik traefik traefik:traefik (from the name) | before 2.11.57; from 3.0.0, < 3.7.13 | CNA record |
traefik traefik traefik:traefik | before 2.11.57; from 3.0.0 before 3.7.13 | NVD |
References
- https://github.com/traefik/traefik/security/advisories/GHSA-f52w-8j3h-j724x-refsource-confirm, patch, vendor-advisory
- https://github.com/traefik/traefik/pull/13796x-refsource-misc, issue-tracking, patch
- https://github.com/traefik/traefik/commit/58d1e9ca204526823211e30fd4634101c59d58e9x-refsource-misc, patch
- https://github.com/traefik/traefik/releases/tag/v2.11.57x-refsource-misc, release-notes
- https://github.com/traefik/traefik/releases/tag/v3.7.13x-refsource-misc, release-notes
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.