Bug 2493652 (CVE-2026-47220) - CVE-2026-47220 envoy: Envoy: Denial of Service via missing host header in specific logging configurations
Summary: CVE-2026-47220 envoy: Envoy: Denial of Service via missing host header in spe...
Keywords:
Status: NEW
Alias: CVE-2026-47220
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
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Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-06-26 19:01 UTC by OSIDB Bzimport
Modified: 2026-06-26 19:51 UTC (History)
1 user (show)

Fixed In Version:
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Description OSIDB Bzimport 2026-06-26 19:01:58 UTC 
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.
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