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.

CVSS v3 7.5 HIGH

7.5^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

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

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:envoyproxy:envoy::::::::
	cpe:2.3:a:envoyproxy:envoy::::::::

History

25 Oct 2026, 17:10

Type	Values Removed	Values Added
Summary		(es) Envoy es un proxy de borde y de servicio de código abierto diseñado para aplicaciones nativas de la nube. Desde la versión 1.37.0 hasta la 1.37.5 y la 1.38.3, cuando se utiliza el %REQUESTED_SERVER_NAME(X:Y)% en el formato de registro y se especifican opciones relacionadas con el host, como HOST_FIRST, SNI_FIRST, es posible bloquear Envoy si falta el encabezado de host especificado en los encabezados de la solicitud. Esta vulnerabilidad está corregida en las versiones 1.37.5 y 1.38.3.

Information

Published : 2026-06-26 19:16

Updated : 2026-10-25 17:10

NVD link : CVE-2026-47220

Mitre link : CVE-2026-47220

CVE.ORG link : CVE-2026-47220

JSON object : View

Products Affected

envoyproxy

envoy

CWE

CWE-476

NULL Pointer Dereference

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