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.
References
| Link | Resource |
|---|---|
| https://github.com/traefik/traefik/commit/ddc1bf4660b85fd61fafdd821eb8216fb1a0b130 | Patch |
| https://github.com/traefik/traefik/pull/13816 | Issue Tracking Patch |
| https://github.com/traefik/traefik/releases/tag/v3.7.13 | Release Notes |
| https://github.com/traefik/traefik/security/advisories/GHSA-8fcf-v89g-xpg6 | Vendor Advisory Patch |
Configurations
History
29 Oct 2026, 17:08
| Type | Values Removed | Values Added |
|---|---|---|
| First Time |
Traefik
Traefik traefik |
|
| CPE | cpe:2.3:a:traefik:traefik:*:*:*:*:*:*:*:* | |
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 5.3 |
| References | () https://github.com/traefik/traefik/commit/ddc1bf4660b85fd61fafdd821eb8216fb1a0b130 - Patch | |
| References | () https://github.com/traefik/traefik/pull/13816 - Issue Tracking, Patch | |
| References | () https://github.com/traefik/traefik/releases/tag/v3.7.13 - Release Notes | |
| References | () https://github.com/traefik/traefik/security/advisories/GHSA-8fcf-v89g-xpg6 - Vendor Advisory, Patch |
22 Sep 2026, 16:18
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2026-09-22 16:18
Updated : 2026-10-29 17:08
NVD link : CVE-2026-88010
Mitre link : CVE-2026-88010
CVE.ORG link : CVE-2026-88010
JSON object : View
Products Affected
traefik
- traefik
CWE
CWE-208
Observable Timing Discrepancy