CVE-2026-65601 (GCVE-0-2026-65601)
Vulnerability from cvelistv5 – Published: 2026-07-22 11:21 – Updated: 2026-10-08 15:51
VLAI
EPSS
VEX
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
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
3 references
| URL | Tags |
|---|---|
| https://github.com/traefik/traefik/security/advis… | vendor-advisory |
| https://github.com/traefik/traefik/commit/26c96a3… | patch |
| https://www.vulncheck.com/advisories/traefik-befo… | third-party-advisory |
Impacted products
Date Public
2026-07-09 00:00
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Sightings
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|---|
Nomenclature
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The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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