CVE-2026-114639 traefik CVE debrief

Who should care

Administrators and users of Traefik versions 2.11.0 before 2.11.58 and 3.0.0 before 3.7.14 should be aware of this vulnerability and take necessary actions to update or mitigate it.

Why it matters

CVE-2026-114639 is a high-severity authentication bypass vulnerability in Traefik that requires immediate attention from administrators and users of affected versions.

• Potential unauthorized access to sensitive data
• Possible lateral movement within the network
• Required verification of Traefik versions and configurations
• Need for additional authentication mechanisms

Technical summary

The vulnerability is caused by an authentication bypass issue in Traefik's handling of Negotiate tokens. An unauthenticated attacker can exploit this vulnerability to bypass authentication and potentially gain unauthorized access to the system. This issue arises from Traefik's use of a shared backend connection pool, which can be exploited by attackers on separate frontend connections. The vulnerability has a high CVSS score and requires immediate attention from administrators and users of affected versions. The CVE record and NVD entry provide additional information on the vulnerability, including its description, CVSS score, and affected versions.

Defensive priority

High

Recommended defensive actions

• Review and update Traefik versions to 2.11.58 or later, or 3.7.14 or later
• Implement additional authentication mechanisms to prevent unauthorized access
• Monitor Traefik instances for suspicious activity
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed
• Check relevant monitoring, detection, and logs for exposed assets that need extra review

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, including its description, CVSS score, and affected versions. The vulnerability is caused by the improper handling of authentication tokens in Traefik, which can lead to unauthorized access. The CVE record was published on 2026-10-22T02:16:56.800Z and has not been modified since then. The NVD entry provides additional information on the vulnerability, including its CVSS score and affected versions.

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.