High 7.5Published Jun 26, 2026

CVE-2026-47220Envoy: Segmentation fault when using %REQUESTED_SERVER_NAME% in log format

Updated under an hour ago (Oct 27, 2026, 10:50 PM ET)

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No exploitation reported and no EPSS estimate yet.

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Every CVE for envoyproxy envoy

Exploited in the last 30 days

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.

CVSS: 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): CWE-476
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Modified
Record last updated: Jul 14, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

envoyproxy envoy envoyproxy:envoy (from the name)	from 1.38.0, < 1.38.3; from 1.37.0, < 1.37.5	CNA record
Red Hat OpenShift Service Mesh 2 redhat:service_mesh	2	CISA ADP
envoyproxy envoy envoyproxy:envoy	from 1.37.0 before 1.37.5; from 1.38.0 before 1.38.3	NVD

References

References

https://github.com/envoyproxy/envoy/security/advisories/GHSA-j9wh-4qfm-wf2v	x-refsource-confirm, exploit, vendor-advisory
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

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.