High [CVE-2026-54765] Unauthorized filter context application in Kubernetes Gateway API provider
This high-severity Red Hat Linux advisory covers CVE-2026-54765 affecting Red Hat OpenShift Dev Spaces.
Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.
VulniPulse record published Record updated
Summary
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. 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. This Moderate flaw in Traefik's Kubernetes Gateway API provider, as deployed in Red Hat OpenShift Dev Spaces, could allow an attacker to apply their route's filter context to other requests.
Is CVE-2026-54765 exploited?
No exploitation is reported in the sources VulniPulse tracks: CVE-2026-54765 is not in the CISA KEV catalog (checked ) and this advisory does not report exploitation. That is not proof the vulnerability cannot be exploited.
How do I fix CVE-2026-54765?
Upgrade to a fixed release named by Red Hat:
- 3.7.6
Confirm against the vendor advisory before you patch.
- < 7.0
- < 7.6
Official advisory · high-confidence parse· fetched 5 days ago·verify at source
Mitigation
Upgrade to a fixed release: 3.7.6. That is the remediation for this advisory.
The vendor advisory may list interim mitigations or workarounds not captured here. Review it before change work.
Official advisory · high-confidence parse· fetched 5 days ago·verify at source
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