CVE-2026-65601 (GCVE-0-2026-65601)

Vulnerability from cvelistv5 – Published: 2026-07-22 11:21 – Updated: 2026-07-24 21:35
VLAI
Title
Traefik before 3.7.7 Namespace Confusion via HTTPRoute ExtensionRef
Summary
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.
Severity
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
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-23 13:51 UTC
CWE
  • CWE-863 - Incorrect Authorization
Assigner
References
Impacted products
Vendor Product Version
traefik traefik Affected: 3.7.0 , < 3.7.7 (semver)
Unaffected: 3.7.7 (semver)
    cpe:2.3:a:traefik:traefik:*:*:*:*:*:*:*:*
Create a notification for this product.
Date Public
2026-07-09 00:00
Credits
CuB3y0nd
Show details on NVD website
To clipboard 

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
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  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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