High [CVE-2026-85596] Authentication bypass due to TLS configuration conflict
This high-severity Red Hat Linux advisory covers CVE-2026-85596.
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Summary
A flaw was found in Traefik. This vulnerability allows a remote attacker to bypass authentication, gaining unauthorized access to protected routes.
This occurs due to a conflict in how Traefik handles Transport Layer Security (TLS) options when specific Kubernetes Ingress objects are configured. The conflict causes Traefik to use a less secure default configuration, negating the requirement for client certificates.
When multiple Ingress objects share the same host, client CA secret, and authentication mode, Traefik misinterprets the resulting distinct TLS option names as a configuration conflict.
This causes Traefik to regress to default entrypoint TLS options that do not request client certificates, allowing remote unauthenticated attackers to bypass mTLS requirements on routes protected by auth-tls-verify-client. Red Hat severity: Important — CVSS 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N).
Weakness: CWE-305. Red Hat lists Red Hat OpenShift Dev Spaces; Red Hat OpenShift GitOps as not affected.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
Mitigation checklist
- Consolidate Ingress rules sharing the same host and client CA secret into a single Ingress resource, or avoid using the auth-tls-secret annotation across multiple distinct Ingress objects for a shared host. Alternatively, enforce client certificate validation at an upstream load balancer or API gateway until patched.
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
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