Detections
Analytics
CVE-2026-73512
high
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.
References
https://docs.cloud.google.com/support/bulletins/index#gcp-2026-057
https://github.com/envoyproxy/envoy/security/advisories/GHSA-r6j2-mrm5-72mg
https://github.com/envoyproxy/envoy/releases/tag/v1.39.1
https://github.com/envoyproxy/envoy/releases/tag/v1.38.4
https://github.com/envoyproxy/envoy/releases/tag/v1.37.6
https://github.com/envoyproxy/envoy/releases/tag/v1.36.10
https://github.com/envoyproxy/envoy/commit/f2417eec2ff49abe243d484ded916fbc2faca38d
https://github.com/envoyproxy/envoy/commit/c0e46dabc3ac286bbe608e9274776555911aadb9
https://github.com/envoyproxy/envoy/commit/85495163fdc67364a5258bfe478c34a44f6428b4
https://github.com/envoyproxy/envoy/commit/29dbaae4a9971011e2f1948acfaf383296e901ea