CVE-2026-47204CWE-476

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

Medium · published June 26, 2026

CVSS v3.1
6.5
EPSS
0%
Percentile
38.0
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
6.5 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CVSS v4.0
Not supplied
EPSS
0.00448 · 38.0th percentile
Weakness
CWE-476 · NULL Pointer Dereference
Published
2026-06-26T17:37Z
EPSS history
Timeline
  • 26 JUN 17:37Z
    Envoy: grpc_stats filter segfault on Connect protocol requests to direct_response routes
    cvelistv5