CVE-2026-47220

Envoy: Segmentation fault when using %REQUESTED_SERVER_NAME% in log format

CVSS 7.5 HIGHCWE-476

Vexday Risk Score

18Baixo

Decisão SSVC (CISA)

Track

Sem sinal de exploração → monitorar

CVSS 7.5EPSS —KEV nãoPoC —Nuclei —Metasploit —Patch —

Ciclo de vida

26 jun 2026Publicada no NVD

Recomendação: Monitorar — sem sinal de exploração no momento.

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Produtos afetados

envoyproxy · envoy

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Referências

https://github.com/envoyproxy/envoy/security/advisories/GHSA-j9wh-4qfm-wf2v