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.
References
| Link | Resource |
|---|---|
| https://github.com/traefik/traefik/commit/b5ace8eb5d6779980567f5e75efd2d9e08b7e350 | Patch |
| https://github.com/traefik/traefik/pull/13572 | Patch |
| https://github.com/traefik/traefik/releases/tag/v3.6.25 | Patch Release Notes |
| https://github.com/traefik/traefik/releases/tag/v3.7.10 | Patch Release Notes |
| https://github.com/traefik/traefik/security/advisories/GHSA-6765-c87h-8mrf | Patch Vendor Advisory |
Configurations
Configuration 1 (hide)
|
History
16 Sep 2026, 20:44
| Type | Values Removed | Values Added |
|---|---|---|
| References | () https://github.com/traefik/traefik/commit/b5ace8eb5d6779980567f5e75efd2d9e08b7e350 - Patch | |
| References | () https://github.com/traefik/traefik/pull/13572 - Patch | |
| References | () https://github.com/traefik/traefik/releases/tag/v3.6.25 - Patch, Release Notes | |
| References | () https://github.com/traefik/traefik/releases/tag/v3.7.10 - Patch, Release Notes | |
| References | () https://github.com/traefik/traefik/security/advisories/GHSA-6765-c87h-8mrf - Patch, Vendor Advisory | |
| First Time |
Traefik
Traefik traefik |
|
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 3.8 |
| CPE | cpe:2.3:a:traefik:traefik:*:*:*:*:*:*:*:* |
Information
Published : 2026-08-06 22:18
Updated : 2026-09-16 20:44
NVD link : CVE-2026-71326
Mitre link : CVE-2026-71326
CVE.ORG link : CVE-2026-71326
JSON object : View
Products Affected
traefik
- traefik
CWE
CWE-287
Improper Authentication