CVE-2026-71326Traefik: BasicAuth singleflight key collision allows authenticated identity spoofing
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 2.1 LOW (v4.0, CNA)CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
- Weakness (CWE)
- CWE-287
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- GitHub_M
- NVD analysis
- Analyzed
- Record last updated
- Aug 8, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
traefik traefik traefik:traefik (from the name) | from 3.6.11, < 3.6.25; from 3.7.0, < 3.7.10 | CNA record |
traefik traefik traefik:traefik | from 3.6.11 before 3.6.25; from 3.7.0 before 3.7.10 | NVD |
References
- https://github.com/traefik/traefik/security/advisories/GHSA-6765-c87h-8mrfx-refsource-confirm, patch, vendor-advisory
- https://github.com/traefik/traefik/pull/13572x-refsource-misc, patch
- https://github.com/traefik/traefik/commit/b5ace8eb5d6779980567f5e75efd2d9e08b7e350x-refsource-misc, patch
- https://github.com/traefik/traefik/releases/tag/v3.6.25x-refsource-misc, patch, release-notes
- https://github.com/traefik/traefik/releases/tag/v3.7.10x-refsource-misc, patch, release-notes
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.