NULL pointer dereference in envoy - CVE-2026-47204
Published: June 24, 2026
Vulnerability identifier: #VU135109
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-47204
CWE-ID: CWE-476
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Cloud Native Computing Foundation
Affected software:
envoy
envoy
Detailed vulnerability description
The vulnerability allows a remote user to cause a denial of service.
The vulnerability exists due to a null pointer dereference in the envoy.filters.http.grpc_stats filter when processing Connect protocol requests to direct_response routes. A remote user can send a specially crafted HTTP request with a Connect content-type header to cause a denial of service.
Only deployments that use the grpc_stats filter on direct_response routes are vulnerable. No special payload, gRPC client, or protobuf framing is required.
How to mitigate CVE-2026-47204
Install security update from vendor's website.