High [CVE-2026-47220] Denial of Service via missing host header in specific logging configurations
This high-severity Red Hat Linux advisory covers CVE-2026-47220.
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Summary
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 flaw was found in Envoy.
This can lead to a crash of the Envoy proxy, resulting in a Denial of Service (DoS). Red Hat products ship Envoy versions prior to 1.37.0, which do not contain the vulnerable %REQUESTED_SERVER_NAME% host-related logging code introduced in 1.37.0.
Red Hat products are therefore not affected by this vulnerability. Red Hat severity: Important — CVSS 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).
Weakness: CWE-476. Red Hat lists OpenShift Service Mesh 2; OpenShift Service Mesh 3 as not affected.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 22 days ago·verify at source
- 1.37.5
- 1.38.3
Official advisory · high-confidence parse· fetched 22 days ago·verify at source
Mitigation checklist
- Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
Official advisory · high-confidence parse· fetched 22 days ago·verify at source
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