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CVE-2026-47220

7.5 high SSVC exploitation: poc Modified
NVD · CVE.org

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.

Fix

Patch, vendor advisory and mitigation references on NVD 2

Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.

Change history 1

  1. First seenCVSS 7.5 · envoyproxyNVD modified 2026-10-25 17:10

Affected (CPE criteria) 1

  • cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*

References 5