CVE catalog
CVE-2026-88004
Traefik is an open source HTTP reverse proxy and load balancer. From 3.2.0 until 3.7.13, Traefik entrypoint defenses aliasHeadersStrategy, underscoreHeadersStrategy, and forwardedHeaders inspect req.H
- Severity
- High · CVSS 7.4
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N - Published
- Updated
- Source
- [NVD] · [CVE record]
- EPSS
- 0.45% · Oct 25, 2026
Traefik is an open source HTTP reverse proxy and load balancer. From 3.2.0 until 3.7.13, Traefik entrypoint defenses aliasHeadersStrategy, underscoreHeadersStrategy, and forwardedHeaders inspect req.Header but not req.Trailer, allowing an unauthenticated client to submit an aliasing or trusted header name in an HTTP/1.1 chunked trailer or an HTTP/2 trailer. When the retry or buffering middleware reads the body before the reverse proxy clones the request, the attacker-controlled trailer value reaches a backend that merges trailers into the header namespace, bypassing the documented delete or reject behavior and potentially spoofing identity or forwarded routing data. This issue is fixed in 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 |
| 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 | Not reported | unknown |
| 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-V67P-PHPQ-FC8X | Not reported |
| Cpe | traefik | cpe | Not reported | 3.7.13 | Not reported | NVD-CVE-2026-88004 | Not reported |
| Go | github.com/traefik/traefik/v3 | Go | Not reported | 3.7.13 | Not reported | GO-2026-6467 | 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-2026-88004]
- [https://osv.dev/vulnerability/GHSA-v67p-phpq-fc8x]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-88004.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]