Authentication Bypass

Traefik is vulnerable to Authentication Bypass. The vulnerability is due to improper handling of decoded and percent-encoded URL paths in the StripPrefixRegex middleware when used with authentication mechanisms such as ForwardAuth, BasicAuth, or DigestAuth, which allows an unauthenticated attacke...

CVE-2026-40912

A flaw was found in Traefik, an HTTP reverse proxy and load balancer. This authentication bypass vulnerability allows an unauthenticated attacker to access protected content. The flaw occurs when the StripPrefixRegex middleware is used with authentication mechanisms such as ForwardAuth, BasicAuth...

SUSE CVE-2026-41263

Traefik is an HTTP reverse proxy and load balancer. Prior to versions 2.11.43, 3.6.14, and 3.7.0-rc.2, there is a timing side-channel vulnerability in Traefik's BasicAuth middleware that allows an attacker to enumerate valid usernames through response-time differences. The variable intended to ho...

CVE-2026-41263 Traefik: BasicAuth middleware: timing side-channel vulnerability

Traefik is an HTTP reverse proxy and load balancer. Prior to versions 2.11.43, 3.6.14, and 3.7.0-rc.2, there is a timing side-channel vulnerability in Traefik's BasicAuth middleware that allows an attacker to enumerate valid usernames through response-time differences. The variable intended to ho...

CVE-2026-41263 Traefik: BasicAuth middleware: timing side-channel vulnerability

Traefik is an HTTP reverse proxy and load balancer. Prior to versions 2.11.43, 3.6.14, and 3.7.0-rc.2, there is a timing side-channel vulnerability in Traefik's BasicAuth middleware that allows an attacker to enumerate valid usernames through response-time differences. The variable intended to ho...

CVE-2026-40912

Traefik is an HTTP reverse proxy and load balancer. Prior to versions 2.11.43, 3.6.14, and 3.7.0-rc.2, there is a high severity authentication bypass vulnerability in Traefik's StripPrefixRegex middleware when used in combination with ForwardAuth, BasicAuth, or DigestAuth. The middleware matches...

EUVD-2026-26428

Traefik is an HTTP reverse proxy and load balancer. Prior to versions 2.11.43, 3.6.14, and 3.7.0-rc.2, there is a high severity authentication bypass vulnerability in Traefik's StripPrefixRegex middleware when used in combination with ForwardAuth, BasicAuth, or DigestAuth. The middleware matches...

CVE-2026-41263: Observable Timing Discrepancy

Traefik is an HTTP reverse proxy and load balancer. Prior to versions 2.11.43, 3.6.14, and 3.7.0-rc.2, there is a timing side-channel vulnerability in Traefik's BasicAuth middleware that allows an attacker to enumerate valid usernames through response-time differences. The variable intended to ho...

Traefik 安全漏洞

Traefik is an open-source reverse proxy and load balancing tool developed by Traefik. There were security vulnerabilities in versions prior to Traefik 2.11.43, 3.6.14, and 3.7.0-rc.2. These vulnerabilities stemmed from the StripPrefixRegex middleware, which, when used in conjunction with...

Traefik: A timing side-channel vulnerability allows for valid username enumeration via BasicAuth middleware

Summary There is a timing side-channel vulnerability in Traefik's BasicAuth middleware that allows an attacker to enumerate valid usernames through response-time differences. The variable intended to hold a constant-time fallback secret always resolves to an empty string, causing the constant-tim...

Traefik has an StripPrefixRegex Middleware Authorization Bypass via Path/RawPath Desync

Summary There is a high severity authentication bypass vulnerability in Traefik's StripPrefixRegex middleware when used in combination with ForwardAuth, BasicAuth, or DigestAuth. The middleware matches the regex against the decoded URL path but uses the resulting byte length to slice the...

PT-2026-36184

Name of the Vulnerable Software and Affected Versions Traefik versions prior to 2.11.43 Traefik versions prior to 3.6.14 Traefik versions prior to 3.7.0-rc.2 Description A timing side-channel issue exists in the BasicAuth middleware. A variable meant to provide a constant-time fallback secret...

CVE-2026-33677 Webhook BasicAuth Credentials Exposed to Read-Only Project Collaborators via API

Vikunja is an open-source self-hosted task management platform. Prior to version 2.2.1, the GET /api/v1/projects/:project/webhooks endpoint returns webhook BasicAuth credentials basicauthuser and basicauthpassword in plaintext to any user with read access to the project. While the existing code...

PT-2026-27450

Name of the Vulnerable Software and Affected Versions Vikunja versions prior to 2.2.1 Description Vikunja is a self-hosted task management platform. The GET /api/v1/projects/:project/webhooks API endpoint exposes BasicAuth credentials basic auth user and basic auth password in plaintext to users...

GO-2026-4792 Traefik Affected by BasicAuth Middleware Timing Attack Allows Username Enumeration in github.com/traefik/traefik

Traefik Affected by BasicAuth Middleware Timing Attack Allows Username Enumeration in github.com/traefik/traefik...

Traefik Affected by BasicAuth Middleware Timing Attack Allows Username Enumeration

Summary There is a potential vulnerability in Traefik's 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 immediatel...

CVE-2026-32595 Traefik: BasicAuth Middleware Timing Attack Allows Username Enumeration

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 taki...

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 taki...

CVE-2026-32595 Traefik: BasicAuth Middleware Timing Attack Allows Username Enumeration

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 taki...

CVE-2026-32595

Traefik vulnerability CVE-2026-32595 affects the BasicAuth middleware in multiple releases. When a submitted username exists, a bcrypt comparison runs ~166 ms; if the username does not exist, the response is ~0.6 ms. This timing difference enables an unauthenticated attacker to distinguish valid ...