Vulnerability 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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Envoyproxy | Envoy | < 1.36.10 |
Related Weaknesses (CWE)
References
- https://github.com/envoyproxy/envoy/commit/29dbaae4a9971011e2f1948acfaf383296e90Patch
- https://github.com/envoyproxy/envoy/commit/85495163fdc67364a5258bfe478c34a44f642Patch
- https://github.com/envoyproxy/envoy/commit/c0e46dabc3ac286bbe608e9274776555911aaPatch
- https://github.com/envoyproxy/envoy/commit/f2417eec2ff49abe243d484ded916fbc2facaPatch
- https://github.com/envoyproxy/envoy/releases/tag/v1.36.10Release Notes
- https://github.com/envoyproxy/envoy/releases/tag/v1.37.6Release Notes
- https://github.com/envoyproxy/envoy/releases/tag/v1.38.4Release Notes
- https://github.com/envoyproxy/envoy/releases/tag/v1.39.1Release Notes
- https://github.com/envoyproxy/envoy/security/advisories/GHSA-r6j2-mrm5-72mgExploitVendor AdvisoryMitigation
- https://github.com/envoyproxy/envoy/security/advisories/GHSA-r6j2-mrm5-72mgExploitVendor AdvisoryMitigation
FAQ
What is CVE-2026-73512?
CVE-2026-73512 is a vulnerability with a CVSS score of 7.5 (HIGH). 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 ...
How severe is CVE-2026-73512?
CVE-2026-73512 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-73512?
Check the references section above for vendor advisories and patch information. Affected products include: Envoyproxy Envoy.