CVSS 4.0
6.3 mediumCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:N/SA:NCVE-2026-32595
Medium (6.3) in traefik traefik. EPSS 0.4% chance of exploitation in the next 30 days. Fixed in github.com/traefik/traefik/v2 2.11.41.
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.
Severity
CVSS 3.1
3.7 lowCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N- EPSS
- 0.4% chance of exploitation in the next 30 days; higher than 33% of CVEs (scores of 2026-10-31)
- CWE
- CWE-208
- Published
- Modified
- Record from
- the NVD, synced
Affected
- traefik:traefik
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-g3hg-j4jv-cwfr | Go | github.com/traefik/traefik | <=1.7.34 | no fix published |
| GHSA-g3hg-j4jv-cwfr | Go | github.com/traefik/traefik/v2 | <2.11.41 | 2.11.41 |
| GHSA-g3hg-j4jv-cwfr | Go | github.com/traefik/traefik/v3 | <3.6.11 | 3.6.11 |
| GHSA-g3hg-j4jv-cwfr | Go | github.com/traefik/traefik/v3 | >=3.7.0-ea.1 <3.7.0-ea.2 | 3.7.0-ea.2 |
| GO-2026-4792 | Go | github.com/traefik/traefik | all versions | no fix published |
| GO-2026-4792 | Go | github.com/traefik/traefik/v2 | <2.11.41 | 2.11.41 |
| GO-2026-4792 | Go | github.com/traefik/traefik/v3 | <3.6.11 >=3.7.0-ea.1 <3.7.0-ea.2 | 3.6.11, 3.7.0-ea.2 |