CVE-2026-114656 traefik CVE debrief

Who should care

Defenders responsible for Traefik instances should assess exposure to unauthenticated clients and prioritize verification of authentication bypass impact. This includes operators, platform administrators, vulnerability management teams, and security teams who manage or are impacted by Traefik deployments.

Why it matters

Defenders should prioritize verifying exposure of Traefik instances to unauthenticated clients and assess the impact of potential authentication bypass.

• Potential authentication bypass for unauthenticated clients
• Possible exposure of Traefik instances to unauthorized access
• Verification of Traefik instance configuration and patching priority

Technical summary

Traefik before 2.11.58 and 3.7.13 contains an authentication bypass vulnerability that allows unauthenticated clients to skip client-certificate checks because negated Host matchers are counted as served domains. Attackers can reach backends protected by RequireAndVerifyClientCert when a router rule with !Host() creates a TLS options conflict that falls back to the default options. This issue affects Traefik instances with specific router rule configurations, potentially allowing unauthorized access to protected backends.

Defensive priority

Defenders should prioritize verifying exposure of Traefik instances to unauthenticated clients and assess the impact of potential authentication bypass.

Recommended defensive actions

• Verify Traefik instance exposure to unauthenticated clients
• Assess the impact of potential authentication bypass
• Update Traefik to version 2.11.58 or 3.7.13
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record and source item provide details on the authentication bypass vulnerability in Traefik before 2.11.58 and 3.7.13. Evidence is limited to public CVE Program records and source item descriptions. Defenders should verify Traefik instance configurations and review potential authentication bypass impact. The CVE Program record was published on 2026-10-22T01:43:42.056Z and has not been modified since then.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.