Envoy: use-after-free in QUIC on internal redirects

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-73512
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-21 20:17:27 UTC
Updated2026-09-22 14:17:14 UTC
DescriptionEnvoy 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.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Problem Types: CWE-416 | CWE-416 CWE-416: Use After Free

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.1CNADECLARED7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Envoyproxy Envoy affected < 1.36.10 Not specified
CNA Envoyproxy Envoy affected >= 1.37.0, < 1.37.6 Not specified
CNA Envoyproxy Envoy affected >= 1.38.0, < 1.38.4 Not specified
CNA Envoyproxy Envoy affected >= 1.39.0, < 1.39.1 Not specified

References

ReferenceSourceLinkTags
github.com/envoyproxy/envoy/commit/c0e46dabc3ac286bbe608e9274776555911aadb9 [email protected] github.com
github.com/envoyproxy/envoy/releases/tag/v1.37.6 [email protected] github.com
github.com/envoyproxy/envoy/commit/85495163fdc67364a5258bfe478c34a44f6428b4 [email protected] github.com
github.com/envoyproxy/envoy/commit/f2417eec2ff49abe243d484ded916fbc2faca38d [email protected] github.com
github.com/envoyproxy/envoy/releases/tag/v1.39.1 [email protected] github.com
github.com/envoyproxy/envoy/security/advisories/GHSA-r6j2-mrm5-72mg 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com
github.com/envoyproxy/envoy/releases/tag/v1.36.10 [email protected] github.com
github.com/envoyproxy/envoy/commit/29dbaae4a9971011e2f1948acfaf383296e901ea [email protected] github.com
github.com/envoyproxy/envoy/releases/tag/v1.38.4 [email protected] github.com
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