{"id":"CVE-2026-73512","published":"2026-09-21T20:17:27.647","lastModified":"2026-09-21T20:17:27.647","description":"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 HttpDatagramHandler caches the current RequestDecoder when Capsule Protocol is enabled. Stream recreation, including an internal redirect, replaces the ActiveStream and updates EnvoyQuicServerStream but does not update the handler's cached pointer. A subsequent HTTP/3 datagram can call decodeData through the freed decoder, causing invalid virtual dispatch and a process crash. The relevant scope boundary is that hTTP/3 datagrams and Capsule Protocol must be enabled, and the request must enter a stream-recreation path such as an internal redirect. This issue is fixed in versions 1.36.10, 1.37.6, 1.38.4, and 1.39.1.","cvssScore":7.5,"cvssSeverity":"HIGH","cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cwes":["CWE-416"],"vendors":[],"products":[],"references":[{"url":"https://github.com/envoyproxy/envoy/commit/29dbaae4a9971011e2f1948acfaf383296e901ea","tags":[]},{"url":"https://github.com/envoyproxy/envoy/commit/85495163fdc67364a5258bfe478c34a44f6428b4","tags":[]},{"url":"https://github.com/envoyproxy/envoy/commit/c0e46dabc3ac286bbe608e9274776555911aadb9","tags":[]},{"url":"https://github.com/envoyproxy/envoy/commit/f2417eec2ff49abe243d484ded916fbc2faca38d","tags":[]},{"url":"https://github.com/envoyproxy/envoy/releases/tag/v1.36.10","tags":[]},{"url":"https://github.com/envoyproxy/envoy/releases/tag/v1.37.6","tags":[]},{"url":"https://github.com/envoyproxy/envoy/releases/tag/v1.38.4","tags":[]},{"url":"https://github.com/envoyproxy/envoy/releases/tag/v1.39.1","tags":[]},{"url":"https://github.com/envoyproxy/envoy/security/advisories/GHSA-r6j2-mrm5-72mg","tags":[]}],"exploitRefs":[{"url":"https://github.com/envoyproxy/envoy/commit/29dbaae4a9971011e2f1948acfaf383296e901ea","tags":[]},{"url":"https://github.com/envoyproxy/envoy/commit/85495163fdc67364a5258bfe478c34a44f6428b4","tags":[]},{"url":"https://github.com/envoyproxy/envoy/commit/c0e46dabc3ac286bbe608e9274776555911aadb9","tags":[]},{"url":"https://github.com/envoyproxy/envoy/commit/f2417eec2ff49abe243d484ded916fbc2faca38d","tags":[]},{"url":"https://github.com/envoyproxy/envoy/releases/tag/v1.36.10","tags":[]},{"url":"https://github.com/envoyproxy/envoy/releases/tag/v1.37.6","tags":[]},{"url":"https://github.com/envoyproxy/envoy/releases/tag/v1.38.4","tags":[]},{"url":"https://github.com/envoyproxy/envoy/releases/tag/v1.39.1","tags":[]},{"url":"https://github.com/envoyproxy/envoy/security/advisories/GHSA-r6j2-mrm5-72mg","tags":[]}],"hasPoc":true,"ai":{"summary":"The flaw allows HTTP/3 datagrams to call decodeData through a freed decoder, causing process crashes. It matters because it can lead to service disruptions and security vulnerabilities.","exploitability":"Exploitation requires enabling Capsule Protocol and HTTP/3 with specific stream recreation conditions; difficult but feasible for attackers targeting affected versions.","blast_radius":"If exploited, could cause significant service downtime and impact cloud-native applications using Envoy proxies.","remediation":"Upgrade to Envoy versions 1.36.10, 1.37.6, 1.38.4, or 1.39.1 immediately to mitigate the risk.","tags":["proxy","http3","capsuleprotocol","crash","service"],"model":"qwen2.5:7b-instruct","analyzedAt":"2026-09-22T06:12:41.985Z"}}