Detections
Analytics
CVE-2026-47220
high
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.
References
https://docs.cloud.google.com/support/bulletins/index#gcp-2026-040
https://github.com/envoyproxy/envoy/security/advisories/GHSA-j9wh-4qfm-wf2v