Vulnerability Description
Traefik is an open source HTTP reverse proxy and load balancer. From 3.6.11 until 3.7.13, checkPassword in pkg/middlewares/auth/basic_auth.go constructs the BasicAuth singleflight key from the submitted password and stored secret. Concurrent requests for absent usernames therefore coalesce on one key while configured usernames perform separate password hashes, creating an unauthenticated timing discrepancy that reveals whether a username exists. Sequential checks remain cost-equalized, Traefik v2 and Digest authentication are not affected, and the issue does not disclose credentials or bypass authentication. This issue is fixed in version 3.7.13.
Related Weaknesses (CWE)
References
- https://github.com/traefik/traefik/commit/ddc1bf4660b85fd61fafdd821eb8216fb1a0b1
- https://github.com/traefik/traefik/pull/13816
- https://github.com/traefik/traefik/releases/tag/v3.7.13
- https://github.com/traefik/traefik/security/advisories/GHSA-8fcf-v89g-xpg6
FAQ
What is CVE-2026-88010?
CVE-2026-88010 is a documented vulnerability. Traefik is an open source HTTP reverse proxy and load balancer. From 3.6.11 until 3.7.13, checkPassword in pkg/middlewares/auth/basic_auth.go constructs the BasicAuth singleflight key from the submitt...
How severe is CVE-2026-88010?
CVSS scoring is not yet available for CVE-2026-88010. Check NVD for updates.
Is there a patch for CVE-2026-88010?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.