CVE-2026-65601
Traefik before 3.7.7 Namespace Confusion via HTTPRoute ExtensionRef
- State
- Published
- Severity
- 5.3 Medium
- Published
- Jul 22, 2026
- Updated
- Oct 8, 2026
- Reserved
- Jul 22, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 5.3 Medium | 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 | VulnCheck |
Weaknesses
- CWE-863 Incorrect Authorization
Affected Products
| Product | Versions |
|---|---|
traefiktraefik |
|
References
- GitHub Security Advisory (GHSA-qq9q-x9w4-chhj)vendor-advisory
- Patch Commitpatch
- VulnCheck Advisory: Traefik before 3.7.7 Namespace Confusion via HTTPRoute ExtensionRefthird-party-advisory
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