CVE-2026-32595

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2026-32595
Traefik is an HTTP reverse proxy and load balancer. Versions 2.11.40 and below, 3.0.0-beta1 through 3.6.11, and 3.7.0-ea.1 comtain BasicAuth middleware that allows username enumeration via a timing attack. When a submitted username exists, the middleware performs a bcrypt password comparison taking ~166ms. When the username does not exist, the response returns immediately in ~0.6ms. This ~298x timing difference is observable over the network and allows an unauthenticated attacker to reliably distinguish valid from invalid usernames. This issue is patched in versions 2.11.41, 3.6.11 and 3.7.0-ea.2.

3.7 /10

CVSS v3 : LOW

V3 Legend

Vector :

Exploitability : 2.2 / Impact : 1.4

Attack Vector NETWORK

Attack Complexity HIGH

Privileges Required NONE

User Interaction NONE

Confidentiality Impact LOW

Integrity Impact NONE

Availability Impact NONE

Scope UNCHANGED

References
Link Resource
https://github.com/traefik/traefik/releases/tag/v2.11.41 Release Notes
https://github.com/traefik/traefik/releases/tag/v3.6.11 Release Notes
https://github.com/traefik/traefik/releases/tag/v3.7.0-ea.2 Release Notes
https://github.com/traefik/traefik/security/advisories/GHSA-g3hg-j4jv-cwfr Patch Vendor Advisory
Configurations

Configuration 1 (hide)

OR cpe:2.3:a:traefik:traefik:*:*:*:*:*:*:*:*
cpe:2.3:a:traefik:traefik:*:*:*:*:*:*:*:*
cpe:2.3:a:traefik:traefik:3.7.0:ea1:*:*:*:*:*:*
History

24 Mar 2026, 15:14

Type Values Removed Values Added
References () https://github.com/traefik/traefik/releases/tag/v2.11.41 - () https://github.com/traefik/traefik/releases/tag/v2.11.41 - Release Notes
References () https://github.com/traefik/traefik/releases/tag/v3.6.11 - () https://github.com/traefik/traefik/releases/tag/v3.6.11 - Release Notes
References () https://github.com/traefik/traefik/releases/tag/v3.7.0-ea.2 - () https://github.com/traefik/traefik/releases/tag/v3.7.0-ea.2 - Release Notes
References () https://github.com/traefik/traefik/security/advisories/GHSA-g3hg-j4jv-cwfr - () https://github.com/traefik/traefik/security/advisories/GHSA-g3hg-j4jv-cwfr - Patch, Vendor Advisory
Summary
  • (es) Traefik es un proxy inverso HTTP y un balanceador de carga. Las versiones 2.11.40 e inferiores, 3.0.0-beta1 hasta 3.6.11, y 3.7.0-ea.1 contienen un middleware BasicAuth que permite la enumeración de nombres de usuario mediante un ataque de temporización. Cuando un nombre de usuario enviado existe, el middleware realiza una comparación de contraseñas bcrypt que tarda aproximadamente 166 ms. Cuando el nombre de usuario no existe, la respuesta se devuelve inmediatamente en aproximadamente 0.6 ms. Esta diferencia de temporización de aproximadamente 298x es observable a través de la red y permite a un atacante no autenticado distinguir de forma fiable los nombres de usuario válidos de los no válidos. Este problema está parcheado en las versiones 2.11.41, 3.6.11 y 3.7.0-ea.2.
CPE cpe:2.3:a:traefik:traefik:*:*:*:*:*:*:*:*
cpe:2.3:a:traefik:traefik:3.7.0:ea1:*:*:*:*:*:*
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 3.7
First Time Traefik
Traefik traefik

20 Mar 2026, 11:18

Type Values Removed Values Added
New CVE
Information

Published : 2026-03-20 11:18

Updated : 2026-03-24 15:14

NVD link : CVE-2026-32595

Mitre link : CVE-2026-32595

CVE.ORG link : CVE-2026-32595

JSON object : View

Products Affected

traefik

  • traefik
CWE
CWE-208

Observable Timing Discrepancy