CVE-2026-32595
Description
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.
How to fix
- traefik traefik2.11.41 or later
- github.com/traefik/traefik/v22.11.41 or later
- github.com/traefik/traefik/v33.6.11, 3.7.0-ea.2 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| traefik traefik | v < 2.11.41, 3.0.0 ≤ v ≤ 3.6.11, 3.7.0 | 2.11.41 |
| github.com/traefik/traefikGo | v ≤ 1.7.34, No range specified | — |
| github.com/traefik/traefik/v2Go | v < 2.11.41 | 2.11.41 |
| github.com/traefik/traefik/v3Go | v < 3.6.11, 3.7.0-ea.1 ≤ v < 3.7.0-ea.2 | 3.6.11, 3.7.0-ea.2 |
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