CVE-2026-47207

MEDIUM

Envoy crashes if multiple unexpected ext_proc responses are packed into one gRPC message

Title source: cna
STIX 2.1

Description

Envoy is an open source edge and service proxy designed for cloud-native applications. From 1.34.0 until 1.35.13, 1.36.9, 1.37.5, and 1.38.3, Envoy crashes if an ext_proc server sends a single gRPC message containing multiple, specially crafted ProcessingResponse messages. This can occur when the first response in the batch causes the gRPC stream object to be destroyed, leading to a use-after-free error when Envoy attempts to process subsequent responses in the same gRPC message. This vulnerability is fixed in 1.35.13, 1.36.9, 1.37.5, and 1.38.3.

References (1)

Core 1
Core References

Scores

CVSS v3 6.5
EPSS 0.0029
EPSS Percentile 21.5%
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-416
Status published
Products (5)
envoyproxy/envoy 1.34.0 - 1.35.13
envoyproxy/envoy >= 1.34.0, < 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