{"schemaVersion":3,"id":"CVE-2026-47220","aliases":[],"status":"published","duplicateOf":null,"title":"Envoy: Segmentation fault when using %REQUESTED_SERVER_NAME% in log format","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 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