Vulnerability DatabaseCVE-2026-47220
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CVE-2026-47220
Published:June 26, 2026
Updated:June 29, 2026
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.
Affected Packages
github.com/envoyproxy/envoy (GO):
Affected version(s) >=v1.37.0 <v1.37.5
Fix Suggestion:
Update to version v1.37.5
github.com/envoyproxy/envoy (GO):
Affected version(s) >=v1.38.0 <v1.38.3
Fix Suggestion:
Update to version v1.38.3
Related Resources (1)
https://github.com/envoyproxy/envoy/security/advisories/GHSA-j9wh-4qfm-wf2v
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CVSS v4
Base Score:
8.7
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
7.5
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Weakness Type (CWE)
NULL Pointer Dereference
CWE-476
EPSS
Base Score:
0.46