Vulnerability · Published Jun 26, 2026 · Assigned by GitHub_M

CVE-2026-47204Envoy: grpc_stats filter segfault on Connect protocol requests to direct_response routes

Medium 6.5

In plain English

A medium-severity null pointer dereference in envoy from envoyproxy. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 39% of all known vulnerabilities).

Severity (CVSS 3.1)6.5Medium

Exploit odds (30 days)0.4%top 60.9% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
envoyproxy	envoy	>= 1.38.0, < 1.38.3>= 1.37.0, < 1.37.5>= 1.36.0, < 1.36.9>= 1.26.0, < 1.35.13

Weakness: CWE-476 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

References

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