CVE-2026-47692: Envoyproxy Envoy

Medium severity, CVSS 4.3. EPSS: 0.2% chance of exploitation in the next 30 days.

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, PROXY Protocol v2 header generator emits TLVs beyond the maximum length of 65535 bytes, causing a mismatch between bytes written and the length field in the header. This can result in smuggled bytes on the upstream request. This vulnerability is fixed in 1.35.13, 1.36.9, 1.37.5, and 1.38.3.

Affected products

• Envoyproxy Envoy: from 1.34.0, before 1.35.13 (fixed in 1.35.13); from 1.36.0, before 1.36.9 (fixed in 1.36.9); from 1.37.0, before 1.37.5 (fixed in 1.37.5); from 1.38.0, before 1.38.3 (fixed in 1.38.3)

Published 2026-06-26. Last modified 2026-06-27.