Use After Free in Envoyproxy Envoy
CVE-2026-47207
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 cr…
Vulnerability class: Use-After-Free
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
Affected products
- Envoyproxy Envoy — versions >= 1.38.0, < 1.38.3, >= 1.37.0, < 1.37.5, >= 1.36.0, < 1.36.9
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM)
Frequently asked questions
- What is CVE-2026-47207?
- CVE-2026-47207 is a medium-severity vulnerability in Envoyproxy Envoy, classified under Use After Free. CVSS score: 6.5/10. Published 2026-06-26.
- How severe is CVE-2026-47207?
- Medium severity. CVSS v3 base score is 6.5 out of 10.