{"cve":"CVE-2026-32595","nvd":{"published":"2026-03-20T11:18:02.537","modified":"2026-06-17T10:36:04.243","status":"Analyzed","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.","cvss_v4":{"vector":"CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:N/SA:N","score":6.3},"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N","score":3.7},"cwes":["CWE-208"],"references":["https://github.com/traefik/traefik/releases/tag/v2.11.41","https://github.com/traefik/traefik/releases/tag/v3.6.11","https://github.com/traefik/traefik/releases/tag/v3.7.0-ea.2","https://github.com/traefik/traefik/security/advisories/GHSA-g3hg-j4jv-cwfr"],"products":["traefik:traefik"],"source":"nvd","synced_at":"2026-10-19T22:26:19.218427112+00:00"},"epss":{"cve":"CVE-2026-32595","score":0.00392,"percentile":0.33338,"date":"2026-11-01"},"kev":null,"osv":[{"id":"GHSA-g3hg-j4jv-cwfr","url":"https://osv.dev/vulnerability/GHSA-g3hg-j4jv-cwfr","summary":"Traefik Affected by BasicAuth Middleware Timing Attack Allows Username Enumeration","modified":"2026-04-16T02:14:31.997982533Z","packages":[{"ecosystem":"Go","name":"github.com/traefik/traefik","purl":"pkg:golang/github.com/traefik/traefik","ranges":["<=1.7.34"],"fixed":[]},{"ecosystem":"Go","name":"github.com/traefik/traefik/v2","purl":"pkg:golang/github.com/traefik/traefik/v2","ranges":["<2.11.41"],"fixed":["2.11.41"]},{"ecosystem":"Go","name":"github.com/traefik/traefik/v3","purl":"pkg:golang/github.com/traefik/traefik/v3","ranges":["<3.6.11"],"fixed":["3.6.11"]},{"ecosystem":"Go","name":"github.com/traefik/traefik/v3","purl":"pkg:golang/github.com/traefik/traefik/v3","ranges":[">=3.7.0-ea.1 <3.7.0-ea.2"],"fixed":["3.7.0-ea.2"]}]},{"id":"GO-2026-4792","url":"https://osv.dev/vulnerability/GO-2026-4792","summary":"Traefik Affected by BasicAuth Middleware Timing Attack Allows Username Enumeration in github.com/traefik/traefik","modified":"2026-04-16T02:14:31.064552072Z","packages":[{"ecosystem":"Go","name":"github.com/traefik/traefik","purl":"pkg:golang/github.com/traefik/traefik","ranges":["all versions"],"fixed":[]},{"ecosystem":"Go","name":"github.com/traefik/traefik/v2","purl":"pkg:golang/github.com/traefik/traefik/v2","ranges":["<2.11.41"],"fixed":["2.11.41"]},{"ecosystem":"Go","name":"github.com/traefik/traefik/v3","purl":"pkg:golang/github.com/traefik/traefik/v3","ranges":["<3.6.11",">=3.7.0-ea.1 <3.7.0-ea.2"],"fixed":["3.6.11","3.7.0-ea.2"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}