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.
Metrics
Affected Vendors & Products
References
History
Tue, 22 Sep 2026 17:30:00 +0000
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ssvc
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Tue, 22 Sep 2026 16:45:00 +0000
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Traefik
Traefik traefik |
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Traefik
Traefik traefik |
Tue, 22 Sep 2026 15:45:00 +0000
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| 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. | |
| Title | Traefik: BasicAuth singleflight coalescing reintroduces an unauthenticated username-enumeration timing oracle | |
| Weaknesses | CWE-208 | |
| References |
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| Metrics |
cvssV4_0
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Status: PUBLISHED
Assigner: GitHub_M
Published: 2026-09-22T15:38:25.969Z
Updated: 2026-09-22T16:00:11.588Z
Reserved: 2026-09-09T19:19:27.406Z
Link: CVE-2026-88010
Updated: 2026-09-22T15:59:10.902Z
Status : Awaiting Analysis
Published: 2026-09-22T16:18:06.963
Modified: 2026-09-24T21:22:19.873
Link: CVE-2026-88010
No data.