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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.

PUBLISHED Reserved 2026-05-18 | Published 2026-06-26 | Updated 2026-06-26 | Assigner GitHub_M




HIGH: 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Problem types

CWE-476: NULL Pointer Dereference

Product status

>= 1.38.0, < 1.38.3
affected

>= 1.37.0, < 1.37.5
affected

References

github.com/.../envoy/security/advisories/GHSA-j9wh-4qfm-wf2v

cve.org (CVE-2026-47220)

nvd.nist.gov (CVE-2026-47220)

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