CVE-2026-88010
mediumTraefik is an open source HTTP reverse proxy and load balancer.
Vendor / product: Traefik — traefik
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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N Affected products
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
References
- https://github.com/traefik/traefik/commit/ddc1bf4660b85fd61fafdd821eb8216fb1a0b130 security-advisories@github.com
- https://github.com/traefik/traefik/pull/13816 security-advisories@github.com
- https://github.com/traefik/traefik/releases/tag/v3.7.13 security-advisories@github.com
- https://github.com/traefik/traefik/security/advisories/GHSA-8fcf-v89g-xpg6 security-advisories@github.com