Traefik is an open source HTTP reverse proxy and load balancer. From 3.6.11 until 3.6.25 and 3.7.10, Traefik's BasicAuth middleware in pkg/middlewares/auth/basic_auth.go deduplicates concurrent password checks with a singleflight key built from the delimiter-free concatenation of password and secret, allowing an attacker who has a valid credential and the stored hash to authenticate as an unconfigured username when headerField trusts the forwarded identity. This issue is fixed in 3.6.25 and 3.7.10.
Metrics
Affected Vendors & Products
References
History
Sat, 08 Aug 2026 03:30:00 +0000
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ssvc
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Fri, 07 Aug 2026 02:45:00 +0000
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Traefik
Traefik traefik |
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Traefik
Traefik traefik |
Thu, 06 Aug 2026 22:15:00 +0000
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| Description | Traefik is an open source HTTP reverse proxy and load balancer. From 3.6.11 until 3.6.25 and 3.7.10, Traefik's BasicAuth middleware in pkg/middlewares/auth/basic_auth.go deduplicates concurrent password checks with a singleflight key built from the delimiter-free concatenation of password and secret, allowing an attacker who has a valid credential and the stored hash to authenticate as an unconfigured username when headerField trusts the forwarded identity. This issue is fixed in 3.6.25 and 3.7.10. | |
| Title | Traefik: BasicAuth singleflight key collision allows authenticated identity spoofing | |
| Weaknesses | CWE-287 | |
| References |
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| Metrics |
cvssV4_0
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Status: PUBLISHED
Assigner: GitHub_M
Published:
Updated: 2026-08-08T02:12:44.764Z
Reserved: 2026-08-05T18:14:42.065Z
Link: CVE-2026-71326
Updated: 2026-08-08T02:12:39.846Z
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OpenCVE Enrichment
Updated: 2026-08-07T02:30:05Z