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.
Advisories
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Fixes
Solution
No solution given by the vendor.
Workaround
No workaround given by the vendor.
References
History
Thu, 23 Jul 2026 14:30:00 +0000
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| Metrics |
ssvc
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Wed, 22 Jul 2026 11:45:00 +0000
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| 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. | |
| Title | Traefik before 3.7.7 Namespace Confusion via HTTPRoute ExtensionRef | |
| First Time appeared |
Traefik
Traefik traefik |
|
| Weaknesses | CWE-863 | |
| CPEs | cpe:2.3:a:traefik:traefik:*:*:*:*:*:*:*:* | |
| Vendors & Products |
Traefik
Traefik traefik |
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| References |
| |
| Metrics |
cvssV4_0
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Projects
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Status: PUBLISHED
Assigner: VulnCheck
Published:
Updated: 2026-07-23T13:51:17.922Z
Reserved: 2026-07-22T10:48:36.000Z
Link: CVE-2026-65601
Updated: 2026-07-23T13:51:13.075Z
No data.
No data.
OpenCVE Enrichment
Updated: 2026-07-23T02:00:10Z
Weaknesses