CVE-2026-65601
MEDIUM
5.3
CVSS 4.0
Description
Traefik versions 3.7.0 through 3.7.6 contain a namespace confusion vulnerability in the Kubernetes Gateway API provider. When resolving HTTPRoute.spec.rules[].backendRefs[].filters[].extensionRef, Traefik used the backend Service namespace instead of the HTTPRoute namespace. A low-privileged route author holding a ReferenceGrant for a cross-namespace Service could therefore bind a Traefik Middleware from the backend namespace without a separate grant for that middleware, potentially injecting trusted reverse-proxy identity headers into downstream requests. The issue is fixed in version 3.7.7.
Metadata
Severity & Metrics
5.3
MEDIUM CVSS 4.0
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N
Affected products (1)
| Vendor | Product | Platform | Versions |
|---|---|---|---|
| traefik | traefik | — | 3.7.0 < 3.7.7, 3.7.7 |
Weakness (CWE)
| CWE | Source | Description |
|---|---|---|
| CWE-863 | cna | Incorrect Authorization |
CVSS scores (1)
| Score | Severity | Version | Source | Vector |
|---|---|---|---|---|
| 5.3 | MEDIUM | 4.0 | cna | CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N |
References (3)
- GitHub Security Advisory (GHSA-qq9q-x9w4-chhj) https://github.com/traefik/traefik/security/advisories/GHSA-qq9q-x9w4-chhj
- https://github.com/traefik/traefik/commit/26c96a3935cafb473f4a5bae1886560d9aa4e4f0 https://github.com/traefik/traefik/commit/26c96a3935cafb473f4a5bae1886560d9aa4e4f0
- VulnCheck Advisory: Traefik before 3.7.7 Namespace Confusion via HTTPRoute ExtensionRef https://www.vulncheck.com/advisories/traefik-before-namespace-confusion-via-httproute-extensionref