Use-after-free in envoy - CVE-2026-47207
Published: June 24, 2026
Vulnerability identifier: #VU135116
CSH Severity: Low
CVSS v4: 7.1 [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]
CVE-ID: CVE-2026-47207
CWE-ID: CWE-416
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to cause a denial of service.
The vulnerability exists due to use-after-free in AsyncStreamImpl::onData() when processing a single gRPC message containing multiple specially crafted ProcessingResponse messages from an ext_proc server. A remote user can send a specially crafted gRPC message to cause a denial of service.
Exploitation requires the ext_proc filter to be configured in the HTTP filter chain.
Affected software
envoy
How to mitigate CVE-2026-47207
Install security update from vendor's website.
envoy - addressed in versions 1.35.12, 1.36.8, 1.37.4, 1.38.2