{"attribution":"This product uses data from the NVD API but is not endorsed or certified by the NVD.","cve":{"id":"CVE-2026-73549","sourceIdentifier":"security-advisories@github.com","published":"2026-09-21T20:17:28.567","lastModified":"2026-10-05T14:09:22.283","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 Utility::copyInternetAddressAndPort and QUIC client-address paths reconstruct scoped IPv6 addresses through addressAsString and Ipv6Instance. The string includes a percent scope identifier that inet_pton cannot parse, causing an exception or abort. Kernel-provided scoped IPv6 destinations in ORIGINAL_DST transparent-proxy deployments, and affected QUIC connection paths, can therefore terminate the process. The relevant scope boundary is that the HTTP use_http_header override rejects scoped addresses earlier; the advisory's crash path requires a kernel-provided original destination or the affected QUIC path. 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:H/PR:L/UI:N/S:U/C:N/I:N/A:H","baseScore":5.3,"baseSeverity":"MEDIUM","attackVector":"NETWORK","attackComplexity":"HIGH","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"},"exploitabilityScore":1.6,"impactScore":3.6}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-09-22T13:29:09.394045Z","id":"CVE-2026-73549","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"weaknesses":[{"source":"security-advisories@github.com","type":"Secondary","description":[{"lang":"en","value":"CWE-754"}]}],"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/109e5a5b08ad10d99074cefd55a747a16ee64da7","source":"security-advisories@github.com","tags":["Patch"]},{"url":"https://github.com/envoyproxy/envoy/commit/59b1744a6cb62746db418ac06fc5e359fd25fdb7","source":"security-advisories@github.com","tags":["Patch"]},{"url":"https://github.com/envoyproxy/envoy/commit/6e39f4c94deff7a60d382c2d95883e0ea49ff691","source":"security-advisories@github.com","tags":["Patch"]},{"url":"https://github.com/envoyproxy/envoy/commit/ab2dca2d65b079768230a7c3d825afeefa330215","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-jp5f-qr64-c9vw","source":"security-advisories@github.com","tags":["Vendor Advisory","Mitigation"]}]}}