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.

Score

CVSS 3.1 7.5 High

Status

Modified - security-advisories@github.com

Published

2026-06-26

Last modified

2026-10-25

Weaknesses

CWE-476

Affected products

• Envoy (Envoyproxy)
• Service Mesh (Redhat)

References

• https://github.com/envoyproxy/envoy/security/advisories/GHSA-j9wh-4qfm-wf2v
• https://access.redhat.com/security/cve/CVE-2026-47220
• https://bugzilla.redhat.com/show_bug.cgi?id=2493652
• https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-47220.json