High severity8.2NVD Advisory· Published Sep 10, 2026· Updated Sep 14, 2026
CVE-2026-88009
CVE-2026-88009
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.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
github.com/traefik/traefik/v3Go | >= 3.0.0, < 3.7.13 | 3.7.13 |
github.com/traefik/traefik/v2Go | < 2.11.57 | 2.11.57 |
Affected products
5- osv-coords2 versionspkg:rpm/opensuse/govulncheck-vulndb&distro=openSUSE%20Leap%2016.0pkg:rpm/opensuse/traefik&distro=openSUSE%20Tumbleweed
< 0.0.20260916T180043-160000.1.1+ 1 more
- (no CPE)range: < 0.0.20260916T180043-160000.1.1
- (no CPE)range: < 3.7.13-1.1
Patches
Vulnerability mechanics
References
7- github.com/traefik/traefik/commit/58d1e9ca204526823211e30fd4634101c59d58e9nvdPatchWEB
- github.com/traefik/traefik/pull/13796nvdIssue TrackingPatchWEB
- github.com/traefik/traefik/security/advisories/GHSA-f52w-8j3h-j724nvdPatchVendor AdvisoryWEB
- github.com/advisories/GHSA-f52w-8j3h-j724ghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-88009ghsaADVISORY
- github.com/traefik/traefik/releases/tag/v2.11.57nvdRelease NotesWEB
- github.com/traefik/traefik/releases/tag/v3.7.13nvdRelease NotesWEB
News mentions
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