{"id":"BIT-envoy-2026-73551","summary":"Envoy: Path normalization does not handle dot and dotdot segments with parameters","details":"Envoy is an open source edge and service proxy designed for cloud-native applications. Prior to 1.36.10, 1.37.6, 1.38.4, and 1.39.1, Envoy's URL normalization does not recognize dot and dotdot path segments when they carry semicolon parameters. A request such as /user/..;foo=bar/admin is therefore not canonicalized to /admin even when path normalization is enabled. If an upstream interprets the segment according to RFC 3986 while Envoy applies routing or RBAC to the uncollapsed path, a remote client can cause path confusion and bypass path-based security policy. The relevant scope boundary is that the security consequence depends on a downstream/upstream path interpretation mismatch or a path-based Envoy decision. This issue is fixed in versions 1.36.10, 1.37.6, 1.38.4, and 1.39.1.","aliases":["CVE-2026-73551","GHSA-2w8w-rfw7-8gg4"],"modified":"2026-09-29T10:10:50.577110954Z","published":"2026-09-29T08:43:16.381Z","database_specific":{"severity":"Medium","cpes":["cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*"]},"references":[{"type":"WEB","url":"https://github.com/envoyproxy/envoy/commit/28b6d60a6d96edeece121cac5be701eb46cc7f24"},{"type":"WEB","url":"https://github.com/envoyproxy/envoy/commit/d40a68b0a30a003c4e0a9fd3af637f828b52c37b"},{"type":"WEB","url":"https://github.com/envoyproxy/envoy/commit/e9d6c329f9a3ff19432bf39b60c601df7e3eda33"},{"type":"WEB","url":"https://github.com/envoyproxy/envoy/commit/f74d1107c4f5c9679b66f7a03a6c5b75ddde1989"},{"type":"WEB","url":"https://github.com/envoyproxy/envoy/releases/tag/v1.36.10"},{"type":"WEB","url":"https://github.com/envoyproxy/envoy/releases/tag/v1.37.6"},{"type":"WEB","url":"https://github.com/envoyproxy/envoy/releases/tag/v1.38.4"},{"type":"WEB","url":"https://github.com/envoyproxy/envoy/releases/tag/v1.39.1"},{"type":"WEB","url":"https://github.com/envoyproxy/envoy/security/advisories/GHSA-2w8w-rfw7-8gg4"},{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-73551"}],"affected":[{"package":{"name":"envoy","ecosystem":"Bitnami","purl":"pkg:bitnami/envoy"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.36.10"},{"introduced":"1.37.0"},{"fixed":"1.37.6"},{"introduced":"1.38.0"},{"fixed":"1.38.4"},{"introduced":"1.39.0"},{"fixed":"1.39.1"}]}],"database_specific":{"source":"https://github.com/bitnami/vulndb/tree/main/data/envoy/BIT-envoy-2026-73551.json"},"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N"}]}],"schema_version":"1.9.0"}