CVE-2026-88008
Description
Traefik is an open source HTTP reverse proxy and load balancer. From 2.11.26 until 2.11.57 and 3.7.13, Traefik forwards a client-supplied Connection header requesting Upgrade, the Upgrade: h2c token, and HTTP2-Settings to a shared backend. If the backend accepts h2c and returns 101 Switching Protocols, Traefik enters a raw tunnel and no longer applies routers, BasicAuth, ForwardAuth, IPAllowList, RateLimit, access logging, metrics, or tracing to later HTTP/2 requests, allowing an unauthenticated request through an unprotected route to reach protected paths on the same backend. This issue is fixed in 2.11.57 and 3.7.13.
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Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
github.com/traefik/traefik/v3Go | >= 3.4.2, < 3.7.13 | 3.7.13 |
github.com/traefik/traefik/v2Go | >= 2.11.26, < 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/a277e94664ffc1ce9543df552d3bbf48d4d3b8b3nvdPatchWEB
- github.com/traefik/traefik/pull/13797nvdIssue TrackingPatchWEB
- github.com/traefik/traefik/security/advisories/GHSA-w4v4-9rw7-5326nvdPatchVendor AdvisoryWEB
- github.com/advisories/GHSA-w4v4-9rw7-5326ghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-88008ghsaADVISORY
- 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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