Critical [CVE-2026-65601] Privilege Escalation via Kubernetes Gateway API Namespace Confusion
This critical-severity Red Hat Linux advisory covers CVE-2026-65601 affecting Red Hat OpenShift Dev Spaces 3.30.
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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.
A flaw was found in Traefik, a cloud-native edge router. This flaw allows an attacker to bypass security controls by incorrectly binding a Traefik Middleware from a different namespace, potentially leading to the injection of trusted identity headers into network requests.
This could result in unauthorized access or privilege escalation within the Kubernetes cluster. This is an Important flaw in Traefik's Kubernetes Gateway API provider, affecting Red Hat OpenShift Dev Spaces.
A low-privileged user in a Kubernetes environment can exploit a namespace confusion vulnerability to bypass security controls. Red Hat severity: Important — CVSS 9.6 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N).
Weakness: CWE-348. Affected Red Hat products: Red Hat OpenShift Dev Spaces 3.30.
- 3.7.0
- 3.7.6
Official advisory · high-confidence parse· fetched 8 days ago·verify at source
- 3.7.7
- devspaces/traefik-rhel9:1787756799
- RHSA-2026:62260
Official advisory · high-confidence parse· fetched 8 days ago·verify at source
Mitigation
Upgrade to a fixed release: 3.7.7, devspaces/traefik-rhel9:1787756799, RHSA-2026:62260. 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 8 days ago·verify at source
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