CVE-2026-47204

MEDIUM

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

Title source: cna

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.

References (1)

Core 1

Core References

X_Refsource_Confirm x_refsource_confirm

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

Scores

CVSS v3 6.5

EPSS 0.0030

EPSS Percentile 22.5%

Attack Vector NETWORK

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

CISA SSVC

Vulnrichment

Exploitation poc

Automatable no

Technical Impact partial

Details

CWE

CWE-476

Status published

Products (5)

envoyproxy/envoy 1.26.0 - 1.35.13

envoyproxy/envoy >= 1.26.0, < 1.35.13

envoyproxy/envoy >= 1.36.0, < 1.36.9

envoyproxy/envoy >= 1.37.0, < 1.37.5

envoyproxy/envoy >= 1.38.0, < 1.38.3

Published Jun 26, 2026

Tracked Since Jun 26, 2026