CVE catalog
CVE-2026-88008
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,
- Severity
- Critical · CVSS 9.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N - Published
- Updated
- Source
- [NVD] · [CVE record]
- EPSS
- 0.49% · Oct 25, 2026
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.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Go | github.com/traefik/traefik/v3 | Not reported | 3.7.13 | fixed |
| Go | github.com/traefik/traefik/v2 | Not reported | 2.11.57 | fixed |
| Cpe | traefik | Not reported | 3.7.13 | fixed |
| Go | github.com/traefik/traefik | Not reported | Not reported | unknown |
| Go | github.com/traefik/traefik/v2 | Not reported | 2.11.57 | fixed |
| Go | github.com/traefik/traefik/v3 | Not reported | 3.7.13 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Go | github.com/traefik/traefik/v3 | Go | Not reported | 3.7.13 | Not reported | GHSA-W4V4-9RW7-5326 | Not reported |
| Go | github.com/traefik/traefik/v2 | Go | Not reported | 2.11.57 | Not reported | GHSA-W4V4-9RW7-5326 | Not reported |
| Cpe | traefik | cpe | Not reported | 3.7.13 | Not reported | NVD-CVE-2026-88008 | Not reported |
| Go | github.com/traefik/traefik/v2 | Go | Not reported | 2.11.57 | Not reported | GO-2026-6468 | Not reported |
| Go | github.com/traefik/traefik/v3 | Go | Not reported | 3.7.13 | Not reported | GO-2026-6468 | Not reported |
OpenFactory catalog packages
No matching packages in this catalog.
Observed:
References
- [https://ftp.suse.com/pub/projects/security/csaf/opensuse-su-2026_12076-1.json]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-88008]
- [https://osv.dev/vulnerability/GHSA-w4v4-9rw7-5326]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-88008.json]
[FIRST EPSS] · [GitHub Advisory Database] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]