{"attribution":"This product uses data from the NVD API but is not endorsed or certified by the NVD.","cve":{"id":"CVE-2026-73551","sourceIdentifier":"security-advisories@github.com","published":"2026-09-21T21:17:09.473","lastModified":"2026-10-05T14:06:32.380","vulnStatus":"Analyzed","cveTags":[],"descriptions":[{"lang":"en","value":"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."}],"affected":[{"source":"security-advisories@github.com","affectedData":[{"vendor":"envoyproxy","product":"envoy","versions":[{"version":"\u003c 1.36.10","status":"affected"},{"version":"\u003e= 1.37.0, \u003c 1.37.6","status":"affected"},{"version":"\u003e= 1.38.0, \u003c 1.38.4","status":"affected"},{"version":"\u003e= 1.39.0, \u003c 1.39.1","status":"affected"}]}]}],"metrics":{"cvssMetricV31":[{"source":"security-advisories@github.com","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","baseScore":5.3,"baseSeverity":"MEDIUM","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"LOW","integrityImpact":"NONE","availabilityImpact":"NONE"},"exploitabilityScore":3.9,"impactScore":1.4}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-09-28T20:41:24.834794Z","id":"CVE-2026-73551","options":[{"exploitation":"none"},{"automatable":"yes"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"weaknesses":[{"source":"security-advisories@github.com","type":"Secondary","description":[{"lang":"en","value":"CWE-647"}]}],"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*","versionEndExcluding":"1.36.10","matchCriteriaId":"6A420B14-9ADA-4F6B-ACAA-3045E8690F04"},{"vulnerable":true,"criteria":"cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*","versionStartIncluding":"1.37.0","versionEndExcluding":"1.37.6","matchCriteriaId":"1AD376F3-22D7-4BFB-B00C-BD68F464436F"},{"vulnerable":true,"criteria":"cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*","versionStartIncluding":"1.38.0","versionEndExcluding":"1.38.4","matchCriteriaId":"840E030F-8746-4DBD-87C0-5DF7896294CC"},{"vulnerable":true,"criteria":"cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*","versionStartIncluding":"1.39.0","versionEndExcluding":"1.39.1","matchCriteriaId":"B5C1C594-8142-4F51-BE50-1AF50FD07129"}]}]}],"references":[{"url":"https://github.com/envoyproxy/envoy/commit/28b6d60a6d96edeece121cac5be701eb46cc7f24","source":"security-advisories@github.com","tags":["Patch"]},{"url":"https://github.com/envoyproxy/envoy/commit/d40a68b0a30a003c4e0a9fd3af637f828b52c37b","source":"security-advisories@github.com","tags":["Patch"]},{"url":"https://github.com/envoyproxy/envoy/commit/e9d6c329f9a3ff19432bf39b60c601df7e3eda33","source":"security-advisories@github.com","tags":["Patch"]},{"url":"https://github.com/envoyproxy/envoy/commit/f74d1107c4f5c9679b66f7a03a6c5b75ddde1989","source":"security-advisories@github.com","tags":["Patch"]},{"url":"https://github.com/envoyproxy/envoy/releases/tag/v1.36.10","source":"security-advisories@github.com","tags":["Release Notes"]},{"url":"https://github.com/envoyproxy/envoy/releases/tag/v1.37.6","source":"security-advisories@github.com","tags":["Release Notes"]},{"url":"https://github.com/envoyproxy/envoy/releases/tag/v1.38.4","source":"security-advisories@github.com","tags":["Release Notes"]},{"url":"https://github.com/envoyproxy/envoy/releases/tag/v1.39.1","source":"security-advisories@github.com","tags":["Release Notes"]},{"url":"https://github.com/envoyproxy/envoy/security/advisories/GHSA-2w8w-rfw7-8gg4","source":"security-advisories@github.com","tags":["Vendor Advisory"]}]}}