CVE-2026-47204

Envoy: grpc_stats filter segfault on Connect protocol requests to direct_response routes

State: Published
Severity: 6.5 Medium
Published: Jun 26, 2026
Updated: Jun 29, 2026
Reserved: May 18, 2026

Description

Envoy is an open source edge and service proxy designed for cloud-native applications. From 1.26.0 until 1.35.13, 1.36.9, 1.37.5, and 1.38.3, the envoy.filters.http.grpc_stats filter crashes (null pointer dereference / segfault) when a Connect protocol request (Content-Type: application/connect+proto or application/connect+json) hits a direct_response route. A single unauthenticated HTTP request crashes the Envoy process. This vulnerability is fixed in 1.35.13, 1.36.9, 1.37.5, and 1.38.3.

Scores

CVSS	Score	Vector	Source
3.1	6.5 Medium	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H	GitHub_M

Weaknesses

CWE-476 NULL Pointer Dereference

Affected Products

Product	Versions
envoyenvoyproxy	>= 1.38.0, < 1.38.3Affected >= 1.37.0, < 1.37.5Affected >= 1.36.0, < 1.36.9Affected >= 1.26.0, < 1.35.13Affected

References

https://github.com/envoyproxy/envoy/security/advisories/GHSA-3jxh-8p6x-7pf6

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