Bug 2497555 (CVE-2026-54765)

Summary: CVE-2026-54765 traefik: Traefik: Unauthorized filter context application in Kubernetes Gateway API provider
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: sdawley
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in Traefik's Kubernetes Gateway API provider. An attacker capable of creating an accepted HTTPRoute that shares the same backend Service and port could exploit this vulnerability. The system may incorrectly apply the attacker's route filter context to another route's requests, potentially allowing unauthorized access or information disclosure across different namespaces. This could lead to the application of security-sensitive headers from the attacker's route to legitimate requests, bypassing intended security controls.
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Description OSIDB Bzimport 2026-07-06 22:03:10 UTC 
Traefik is an open source HTTP reverse proxy and load balancer. From v3.7.0 prior to v3.7.6, Traefik's Kubernetes Gateway API provider may resolve two accepted HTTPRoutes that target the same backend Service:port but configure different backendRef filters to the same child service and apply only one route's filter set to all requests reaching that backend. In Gateway deployments where backendRef filters set security-sensitive headers, such as tenant identity, authorization context, or values the backend trusts, an attacker who can create an accepted HTTPRoute sharing the same backend Service:port may cause their route's filter context to be applied to another route's requests, potentially crossing namespace boundaries when a ReferenceGrant permits cross-namespace targeting. This issue is fixed in version v3.7.6.