{"cve":"CVE-2019-9901","nvd":{"published":"2019-04-25T16:29:01.200","modified":"2026-06-17T02:44:49.113","status":"Modified","description":"Envoy 1.9.0 and before does not normalize HTTP URL paths. A remote attacker may craft a relative path, e.g., something/../admin, to bypass access control, e.g., a block on /admin. A backend server could then interpret the non-normalized path and provide an attacker access beyond the scope provided for by the access control policy.","cvss_v4":null,"cvss_v3":{"version":"3.0","vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H","score":10.0},"cwes":["CWE-706"],"references":["https://github.com/envoyproxy/envoy/issues/6435","https://github.com/envoyproxy/envoy/security/advisories/GHSA-xcx5-93pw-jw2w","https://groups.google.com/forum/#%21topic/envoy-announce/VoHfnDqZiAM","https://www.envoyproxy.io/docs/envoy/v1.9.1/intro/version_history","https://github.com/envoyproxy/envoy/issues/6435"],"products":["envoyproxy:envoy"],"source":"nvd","synced_at":"2026-10-19T20:56:19.218283075+00:00"},"epss":{"cve":"CVE-2019-9901","score":0.04951,"percentile":0.92169,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-2wmf-p7f8-w42h","url":"https://osv.dev/vulnerability/GHSA-2wmf-p7f8-w42h","summary":"EnvoyProxy Envoy Missing HTTP URL path normalization","modified":"2026-09-10T03:49:07.252622383Z","packages":[{"ecosystem":"Go","name":"github.com/envoyproxy/envoy","purl":"pkg:golang/github.com/envoyproxy/envoy","ranges":["<1.9.1"],"fixed":["1.9.1"]}]}],"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."]}