Vulnerability in Traefik
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 3.7 (Low). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N.
EPSS exploit prediction
EPSS: 0.004 (29.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 30th percentile — 29.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: -0.000
Affected products
- Traefik — versions 3.7.0, >= 3.0.0-beta1, < 3.6.11, < 2.11.41
Weakness classification (CWE)
References
- github.com/traefik/traefik/security/advisories/GHSA-g3hg-j4jv-cwfr (Patch, Vendor Advisory)
- github.com/traefik/traefik/releases/tag/v2.11.41 (Release Notes)
- github.com/traefik/traefik/releases/tag/v3.6.11 (Release Notes)
- github.com/traefik/traefik/releases/tag/v3.7.0-ea.2 (Release Notes)
Frequently asked questions
- What is CVE-2026-32595?
- CVE-2026-32595 is a low-severity vulnerability in Traefik, classified under CWE-208. CVSS score: 3.7/10. Published 2026-03-20.
- How severe is CVE-2026-32595?
- Low severity. CVSS v3 base score is 3.7 out of 10.