CVE-2026-47220
Envoy: Segmentation fault when using %REQUESTED_SERVER_NAME% in log format
CVSS Score
7.5
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-476 |
| Vendor | envoyproxy |
| Product | envoy |
| Published | Jun 26, 2026 |
| Last Updated | Jul 15, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected Versions
envoyproxy / envoy
>= 1.38.0, < 1.38.3 >= 1.37.0, < 1.37.5
References
github.com: https://github.com/envoyproxy/envoy/security/advisories/GHSA-j9wh-4qfm-wf2v access.redhat.com: https://access.redhat.com/security/cve/CVE-2026-47220 bugzilla.redhat.com: https://bugzilla.redhat.com/show_bug.cgi?id=2493652 security.access.redhat.com: https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-47220.json