Vulnerability Details CVE-2026-65601
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.003
EPSS Ranking 19.5%
CVSS Severity
CVSS v3 Score 8.8
References
Products affected by CVE-2026-65601
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cpe:2.3:a:traefik:traefik:3.7.0
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cpe:2.3:a:traefik:traefik:3.7.1
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cpe:2.3:a:traefik:traefik:3.7.2
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cpe:2.3:a:traefik:traefik:3.7.3
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cpe:2.3:a:traefik:traefik:3.7.4
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cpe:2.3:a:traefik:traefik:3.7.5
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cpe:2.3:a:traefik:traefik:3.7.6