CVE-2026-47220 Details
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.
A segmentation fault vulnerability has been identified in Envoy versions 1.37.0 prior to 1.39. This issue arises when the '%REQUESTED_SERVER_NAME(X:Y)%' log format is used alongside host-related options such as 'HOST_FIRST' or 'SNI_FIRST'. If the host header is missing in the request, Envoy can crash. The vulnerability is rooted in the log handling process, which fails to check for the presence of the 'x-envoy-original-host' or ':authority' headers, leaving room for a null value that triggers the crash.
Users can upgrade to Envoy versions 1.37.5 or 1.38.3 to address this vulnerability.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Jun 29, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://access.redhat.com/security/cve/CVE-2026-47220 | redhat-SADP | |
| https://bugzilla.redhat.com/show_bug.cgi?id=2493652 | redhat-SADP | |
| https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-47220.json | redhat-SADP | |
| https://github.com/envoyproxy/envoy/security/advisories/GHSA-j9wh-4qfm-wf2v | CISA-ADP | ExploitVendor Advisory |
| https://github.com/envoyproxy/envoy/security/advisories/GHSA-j9wh-4qfm-wf2v | [email protected] | ExploitVendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-476 | NULL Pointer Dereference | redhat-SADP |
| CWE-476 | NULL Pointer Dereference | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| envoyproxy envoy | >= 1.37.0, < 1.37.5 >= 1.38.0, < 1.38.3 |
CPE
Remediation
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Change History
5 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 15, 2026 | CVE Modified | redhat-SADP |
| Jun 30, 2026 | CVE Modified | redhat-SADP |
| Jun 29, 2026 | Initial Analysis | [email protected] |
| Jun 29, 2026 | CVE Modified | CISA-ADP |
| Jun 26, 2026 | New CVE Received | [email protected] |