CVE-2026-73512: Envoy: use-after-free in QUIC on internal redirects
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.
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H · CWE-416
Tracked companies
Mapped from the CVE’s affected-product data, NVD CPE matches, vendor advisories or package feeds. A mapping means the vendor’s software is named, not that its hosted service was exposed.
Status incidents that name it
No tracked status incident names this CVE.
Affected vendors and products
envoyproxy: envoy
References
- CVE record on cve.org (opens in new tab)
- NVD entry (opens in new tab)
- github.com/envoyproxy/envoy/commit/29dbaae4a9971011e2f1948acfaf383296e901ea (opens in new tab)
- github.com/envoyproxy/envoy/commit/85495163fdc67364a5258bfe478c34a44f6428b4 (opens in new tab)
- github.com/envoyproxy/envoy/commit/c0e46dabc3ac286bbe608e9274776555911aadb9 (opens in new tab)
- github.com/envoyproxy/envoy/commit/f2417eec2ff49abe243d484ded916fbc2faca38d (opens in new tab)
- github.com/envoyproxy/envoy/releases/tag/v1.36.10 (opens in new tab)
- github.com/envoyproxy/envoy/releases/tag/v1.37.6 (opens in new tab)
- github.com/envoyproxy/envoy/releases/tag/v1.38.4 (opens in new tab)
- github.com/envoyproxy/envoy/releases/tag/v1.39.1 (opens in new tab)
- github.com/envoyproxy/envoy/security/advisories/GHSA-r6j2-mrm5-72mg (opens in new tab)
- CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (opens in new tab)
- This product uses data from the NVD API but is not endorsed or certified by the NVD. (opens in new tab)
- Known Exploited Vulnerabilities catalog from CISA. (opens in new tab)
- EPSS scores from FIRST (Exploit Prediction Scoring System). (opens in new tab)