EUVD-2026-13664
GHSA-g3hg-j4jv-cwfr
CVSS Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
Lifecycle Timeline
4Description
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.
Analysis
Traefik's BasicAuth middleware contains a timing attack vulnerability that enables username enumeration through observable response time differences between valid and invalid usernames. An unauthenticated network attacker can distinguish existing usernames from non-existent ones by measuring response latency-valid usernames trigger ~166ms bcrypt operations while invalid usernames return in ~0.6ms, creating a ~298x timing differential. …
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Remediation
During next maintenance window: Apply vendor patches when convenient. Monitor vendor channels for updates.
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Priority Score
Vendor Status
Debian
Bug #983289| Release | Status | Fixed Version | Urgency |
|---|---|---|---|
| open | - | - |
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External POC / Exploit Code
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