CVE-2026-47220 — Envoy: Segmentation fault when using %REQUESTED_SERVER_NAME% in log format
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 …
Published: 2026-06-26 · CVSS: 7.5 · CVSS 3.1
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7