Vulnerability Details CVE-2026-47220
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.005
EPSS Ranking 36.6%
CVSS Severity
CVSS v3 Score 7.5
References
Products affected by CVE-2026-47220
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cpe:2.3:a:envoyproxy:envoy:1.37.0
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cpe:2.3:a:envoyproxy:envoy:1.37.1
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cpe:2.3:a:envoyproxy:envoy:1.37.2
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cpe:2.3:a:envoyproxy:envoy:1.37.3
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cpe:2.3:a:envoyproxy:envoy:1.37.4
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cpe:2.3:a:envoyproxy:envoy:1.38.0
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cpe:2.3:a:envoyproxy:envoy:1.38.1
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cpe:2.3:a:envoyproxy:envoy:1.38.2