VULNERABILITY INTELLIGENCE

CVE-2026-47220

CVSS score7.5 HIGH
EPSS probability0.66%
CISA KEVNot currently listed
Published2026-06-26
Last modified2026-10-25
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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.

Weakness classification

  • security-advisories@github.com: CWE-476
  • 0b0ca135-0b70-47e7-9f44-1890c2a1c46c: CWE-476

Primary references