Vulnerability Description
Traefik 2.11.0 before 2.11.58 and 3.0.0 before 3.7.14 contains an authentication bypass because a first request preauthenticated with an Authorization: Negotiate token authenticates a socket in the globally shared backend connection pool, which is never isolated. Unauthenticated attackers on separate frontend connections can be assigned that NTLM/Kerberos-bound socket and perform reads or writes with the victim's identity.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Traefik | Traefik | >= 2.11.0, < 2.11.58 |
Related Weaknesses (CWE)
References
- https://github.com/traefik/traefik/security/advisories/GHSA-qm9f-w54v-q2qhVendor Advisory
- https://www.vulncheck.com/advisories/traefik-before-2.11.58-and-3.7.14-authenticThird Party Advisory
FAQ
What is CVE-2026-114639?
CVE-2026-114639 is a vulnerability with a CVSS score of 8.7 (HIGH). Traefik 2.11.0 before 2.11.58 and 3.0.0 before 3.7.14 contains an authentication bypass because a first request preauthenticated with an Authorization: Negotiate token authenticates a socket in the gl...
How severe is CVE-2026-114639?
CVE-2026-114639 has been rated HIGH with a CVSS base score of 8.7/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-114639?
Check the references section above for vendor advisories and patch information. Affected products include: Traefik Traefik.