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CVE-2026-47220

Envoy: Segmentation fault when using %REQUESTED_SERVER_NAME% in log format

Published: Jun 26, 2026Updated: Jul 15, 2026 Sources: CVE List NVDCWE-476
7.5HIGH
NVD MITRE
EPSS Score
0.4%
Top 65.0%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
OpenVAS

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:NA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
High
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Weaknesses

CWE-476

Affected Products

envoyproxy
oss-project·USaka envoy proxy, envoy
envoyOn-prem
Cloud & SaaS / api-gateway

Exploitability

Official Patch Available
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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

2 techniques
Impact
Initial Access
View detailed technique mapping

References

https://github.com/envoyproxy/envoy/security/advisories/GHSA-j9wh-4qfm-wf2v
github.com
https://access.redhat.com/security/cve/CVE-2026-47220
access.redhat.com
https://bugzilla.redhat.com/show_bug.cgi?id=2493652
bugzilla.redhat.com
and 1 more references View all →

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