High severity7.5NVD Advisory· Published Jun 26, 2026· Updated Jul 15, 2026
CVE-2026-47220
CVE-2026-47220
Description
Envoy is an open source edge and service proxy designed for cloud-native applications. From 1.37.0 until 1.37.5 and 1.38.3, when the %REQUESTED_SERVER_NAME(X:Y)% is used in log format and host related options is specified, like HOST_FIRST, SNI_FIRST, it's possible to crash Envoy when the specified host header is missing in the request headers. This vulnerability is fixed in 1.37.5 and 1.38.3.
Affected products
5(expand)+ 2 more
- (no CPE)
- cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*range: >=1.37.0,<1.37.5
- (no CPE)range: 1.37.0 <= v < 1.37.5, 1.38.0 <= v < 1.38.3
- osv-coords2 versions
>= 1.37.0, < 1.37.5+ 1 more
- (no CPE)range: >= 1.37.0, < 1.37.5
- (no CPE)range: < 1.30.2-1.1
Patches
Vulnerability mechanics
References
4News mentions
1- Envoy Proxy: Eleven Vulnerabilities Disclosed Together, Targeting DoS and Memory CorruptionVypr Intelligence · Jun 26, 2026