{"attribution":"This product uses data from the NVD API but is not endorsed or certified by the NVD.","cve":{"id":"CVE-2026-47220","sourceIdentifier":"security-advisories@github.com","published":"2026-06-26T19:16:41.173","lastModified":"2026-10-25T17:10:00.197","vulnStatus":"Modified","cveTags":[],"descriptions":[{"lang":"en","value":"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."},{"lang":"es","value":"Envoy es un proxy de borde y de servicio de código abierto diseñado para aplicaciones nativas de la nube. Desde la versión 1.37.0 hasta la 1.37.5 y la 1.38.3, cuando se utiliza el %REQUESTED_SERVER_NAME(X:Y)% en el formato de registro y se especifican opciones relacionadas con el host, como HOST_FIRST, SNI_FIRST, es posible bloquear Envoy si falta el encabezado de host especificado en los encabezados de la solicitud. Esta vulnerabilidad está corregida en las versiones 1.37.5 y 1.38.3."}],"affected":[{"source":"security-advisories@github.com","affectedData":[{"vendor":"envoyproxy","product":"envoy","versions":[{"version":"\u003e= 1.38.0, \u003c 1.38.3","status":"affected"},{"version":"\u003e= 1.37.0, \u003c 1.37.5","status":"affected"}]}]},{"source":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c","affectedData":[{"vendor":"Red Hat","product":"OpenShift Service Mesh 2","defaultStatus":"unaffected","collectionURL":"https://access.redhat.com/downloads/content/package-browser/","packageName":"openshift-service-mesh/proxyv2-rhel9","cpes":["cpe:/a:redhat:service_mesh:2"]},{"vendor":"Red Hat","product":"OpenShift Service Mesh 3","defaultStatus":"unaffected","collectionURL":"https://access.redhat.com/downloads/content/package-browser/","packageName":"openshift-service-mesh/istio-proxyv2-rhel9","cpes":["cpe:/a:redhat:service_mesh:3"]}]}],"metrics":{"cvssMetricV31":[{"source":"security-advisories@github.com","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","baseScore":7.5,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"},"exploitabilityScore":3.9,"impactScore":3.6},{"source":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","baseScore":7.5,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"},"exploitabilityScore":3.9,"impactScore":3.6}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-06-29T13:26:27.302143Z","id":"CVE-2026-47220","options":[{"exploitation":"poc"},{"automatable":"yes"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"weaknesses":[{"source":"security-advisories@github.com","type":"Secondary","description":[{"lang":"en","value":"CWE-476"}]},{"source":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c","type":"Secondary","description":[{"lang":"en","value":"CWE-476"}]}],"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*","versionStartIncluding":"1.37.0","versionEndExcluding":"1.37.5","matchCriteriaId":"2057BF79-00D1-4154-9DC0-3F278C72F4E1"},{"vulnerable":true,"criteria":"cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*","versionStartIncluding":"1.38.0","versionEndExcluding":"1.38.3","matchCriteriaId":"2A218AD4-BF4B-46EA-96D7-3B25B7E71AC8"}]}]}],"references":[{"url":"https://github.com/envoyproxy/envoy/security/advisories/GHSA-j9wh-4qfm-wf2v","source":"security-advisories@github.com","tags":["Exploit","Vendor Advisory"]},{"url":"https://access.redhat.com/security/cve/CVE-2026-47220","source":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2493652","source":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://github.com/envoyproxy/envoy/security/advisories/GHSA-j9wh-4qfm-wf2v","source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","tags":["Exploit","Vendor Advisory"]},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-47220.json","source":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"}]}}