{"cve":"CVE-2026-48020","nvd":{"published":"2026-06-23T20:16:47.993","modified":"2026-09-02T13:17:58.467","status":"Modified","description":"Traefik is an HTTP reverse proxy and load balancer. Prior to 2.11.48, 3.6.19, and 3.7.3, there is a high severity vulnerability in Traefik's StripPrefix middleware that allows an unauthenticated attacker to bypass route-level authentication and authorization. When a public router matches on a PathPrefix rule and applies the StripPrefix middleware, a request path containing .. or its percent-encoded form %2e%2e can match the public route at routing time and then, after the prefix is stripped and the path is normalized, resolve to a path served by a separate, authenticated router. As a result, an attacker can reach protected backend paths — such as admin or internal configuration endpoints — without satisfying the authentication middleware attached to the protected router. This vulnerability is fixed in 2.11.48, 3.6.19, and 3.7.3.","cvss_v4":{"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N","score":7.8},"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N","score":10.0},"cwes":["CWE-288","CWE-22"],"references":["https://github.com/traefik/traefik/releases/tag/v2.11.48","https://github.com/traefik/traefik/releases/tag/v3.6.19","https://github.com/traefik/traefik/releases/tag/v3.7.3","https://github.com/traefik/traefik/security/advisories/GHSA-xf64-8mw2-4gr2","https://access.redhat.com/errata/RHSA-2026:62260"],"products":["traefik:traefik"],"source":"nvd","synced_at":"2026-10-19T22:41:17.107060303+00:00"},"epss":{"cve":"CVE-2026-48020","score":0.00775,"percentile":0.55793,"date":"2026-11-01"},"kev":null,"osv":[{"id":"GHSA-xf64-8mw2-4gr2","url":"https://osv.dev/vulnerability/GHSA-xf64-8mw2-4gr2","summary":"Traefik has a StripPrefix Route-Level Auth Bypass via Path Normalization","modified":"2026-09-02T15:45:32.566298419Z","packages":[{"ecosystem":"Go","name":"github.com/traefik/traefik/v2","purl":"pkg:golang/github.com/traefik/traefik/v2","ranges":["<2.11.48"],"fixed":["2.11.48"]},{"ecosystem":"Go","name":"github.com/traefik/traefik/v3","purl":"pkg:golang/github.com/traefik/traefik/v3","ranges":["<3.6.19"],"fixed":["3.6.19"]},{"ecosystem":"Go","name":"github.com/traefik/traefik/v3","purl":"pkg:golang/github.com/traefik/traefik/v3","ranges":[">=3.7.0-ea.1 <3.7.3"],"fixed":["3.7.3"]}]},{"id":"GO-2026-5752","url":"https://osv.dev/vulnerability/GO-2026-5752","summary":"Traefik has a StripPrefix Route-Level Auth Bypass via Path Normalization in github.com/traefik/traefik","modified":"2026-06-25T23:01:41.224639580Z","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":["<2.11.48"],"fixed":["2.11.48"]},{"ecosystem":"Go","name":"github.com/traefik/traefik/v3","purl":"pkg:golang/github.com/traefik/traefik/v3","ranges":["<3.6.19",">=3.7.0-ea.1 <3.7.3"],"fixed":["3.6.19","3.7.3"]}]}],"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."]}