{"id":"CVE-2026-47220","state":"PUBLISHED","title":"Envoy: Segmentation fault when using %REQUESTED_SERVER_NAME% in log format","description":"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. 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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."}],"affected":[{"vendor":"envoyproxy","product":"envoy","versions":[{"version":">= 1.38.0, < 1.38.3","status":"affected"},{"version":">= 1.37.0, < 1.37.5","status":"affected"}]}],"references":[{"url":"https://github.com/envoyproxy/envoy/security/advisories/GHSA-j9wh-4qfm-wf2v","name":"https://github.com/envoyproxy/envoy/security/advisories/GHSA-j9wh-4qfm-wf2v","tags":["x_refsource_CONFIRM"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-476","lang":"en","description":"CWE-476: NULL Pointer Dereference","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-06-26T18:02:17.679Z"},"source":{"advisory":"GHSA-j9wh-4qfm-wf2v","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","references":[{"url":"https://github.com/envoyproxy/envoy/security/advisories/GHSA-j9wh-4qfm-wf2v","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-06-29T13:26:27.302143Z","id":"CVE-2026-47220","options":[{"Exploitation":"poc"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-06-29T13:26:30.243Z"}},{"title":"envoy: Envoy: Denial of Service via missing host header in specific logging configurations","descriptions":[{"lang":"en","value":"A flaw was found in Envoy. A remote attacker can exploit this vulnerability by sending a request with a missing host header when the `%REQUESTED_SERVER_NAME(X:Y)%` is used in the log format and host-related options, such as HOST_FIRST or SNI_FIRST, are specified. This can lead to a crash of the Envoy proxy, resulting in a Denial of Service (DoS)."}],"affected":[{"vendor":"Red Hat","product":"OpenShift Service Mesh 2","packageName":"openshift-service-mesh/proxyv2-rhel9","defaultStatus":"unaffected","collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:service_mesh:2"]},{"vendor":"Red Hat","product":"OpenShift Service Mesh 3","packageName":"openshift-service-mesh/istio-proxyv2-rhel9","defaultStatus":"unaffected","collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:service_mesh:3"]}],"references":[{"url":"https://access.redhat.com/security/cve/CVE-2026-47220","tags":["vdb-entry","x_refsource_REDHAT"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2493652","name":"RHBZ#2493652","tags":["issue-tracking","x_refsource_REDHAT"]},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-47220.json","tags":["x_sadp-csaf-vex"]}],"metrics":[{"other":{"content":{"namespace":"https://access.redhat.com/security/updates/classification/","value":"Important"},"type":"Red Hat severity rating"}},{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"format":"CVSS"}],"problemTypes":[{"descriptions":[{"cweId":"CWE-476","description":"NULL Pointer Dereference","lang":"en","type":"CWE"}]}],"providerMetadata":{"shortName":"redhat-SADP","orgId":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c","dateUpdated":"2026-07-15T00:49:05.154Z"},"datePublic":"2026-06-26T18:02:17.679Z","timeline":[{"lang":"en","time":"2026-06-26T19:01:34.167Z","value":"Reported to Red Hat."},{"lang":"en","time":"2026-06-26T18:02:17.679Z","value":"Made public."}],"x_adpType":"supplier","x_generator":{"engine":"sadp-cli 1.0.0"}}]}}}