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Prior to 1.36.10, 1.37.6, 1.38.4, and 1.39.1, Envoy's optional oghttp2 upstream HTTP/2 codec accepts a response trailer HEADERS frame without END_STREAM. Envoy completes and deferred-deletes the ActiveRequest while oghttp2 keeps the stream open, leaving ClientStreamImpl with a dangling response_decoder_ reference. A later frame on the stream can dispatch through the freed object and crash the process. The relevant scope boundary is that the default nghttp2 codec rejects the malformed trailers, and the trigger is upstream-only with oghttp2 enabled. This issue is fixed in versions 1.36.10, 1.37.6, 1.38.4, and 1.39.1.","evidence":"cve:CVE-2026-73513","products":[{"name":{"value":"envoy","evidence":"/containers/cna/affected/0/product"},"prerequisites":[],"fixed_versions":[],"affected_versions":[]}],"severity":"high","structured":{"id":"CVE-2026-73513","aliases":["CVE-2026-73513"],"metrics":[{"cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":7.5,"attackVector":"NETWORK","baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","integrityImpact":"NONE","userInteraction":"NONE","attackComplexity":"LOW","availabilityImpact":"HIGH","privilegesRequired":"NONE","confidentialityImpact":"NONE"}}],"affected":[{"vendor":"envoyproxy","product":"envoy","versions":[{"status":"affected","version":"< 1.36.10"},{"status":"affected","version":">= 1.37.0, < 1.37.6"},{"status":"affected","version":">= 1.38.0, < 1.38.4"},{"status":"affected","version":">= 1.39.0, < 1.39.1"}]}],"modified":"2026-09-28T20:38:56.917Z","provider":"cve","references":["https://github.com/envoyproxy/envoy/security/advisories/GHSA-jjmm-fw8p-crpw","https://github.com/envoyproxy/envoy/commit/0d33268d7d8cdc5c8ffef462e0cceefa56156b72","https://github.com/envoyproxy/envoy/commit/3df69eeee220d6a4088cfdd3be79b55e2e6d3514","https://github.com/envoyproxy/envoy/commit/c4610b6c85d72ed01e014c2a1aba2934a2b774e9","https://github.com/envoyproxy/envoy/commit/e6963c6b64cd62aa8e078ef17c76052b6e33e82b","https://github.com/envoyproxy/envoy/releases/tag/v1.37.6","https://github.com/envoyproxy/envoy/releases/tag/v1.38.4","https://github.com/envoyproxy/envoy/releases/tag/v1.39.1"],"provider_metadata":{"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2026-73513","role":"CISA Coordinator","options":[{"Exploitation":"poc"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"version":"2.0.3","timestamp":"2026-09-28T20:38:43.909577Z"}}}],"references":[{"url":"https://github.com/envoyproxy/envoy/security/advisories/GHSA-jjmm-fw8p-crpw","tags":["exploit"]}],"providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-09-28T20:38:56.917Z"}}],"cna":{"orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M","dateUpdated":"2026-09-21T19:40:49.119Z"}}},"related_cves":[{"value":"CVE-2026-73513","evidence":"/cveMetadata/cveId"}],"security_relevant":true,"severity_evidence":"/containers/cna/metrics"},"group_id":"advisory:a46304b3-3e64-4bd6-88db-739d12ff2208","priority":{"reasons":["publisher_severity"],"severity":"high","linked_cves":[],"fix_available":false,"known_exploited":false,"publisher_severity":"high"},"revision":1,"source_id":"core-cve","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-73513","advisory_id":"a46304b3-3e64-4bd6-88db-739d12ff2208","event_types":["advisory"],"published_at":"2026-10-24T21:33:47.225597+00:00","technologies":["core-cve","envoy"],"context_update":false,"extraction_method":"structured","source_published_at":"2026-09-21T19:40:49.119+00:00","detail_url":"/events/3342"}]}},{"id":3328,"cve_ids":["CVE-2026-73551"],"payload":{"kind":"advisory","title":"Envoy: Path normalization does not handle dot and dotdot segments with parameters","summary":"Envoy is an open source edge and service proxy designed for cloud-native applications. Prior to 1.36.10, 1.37.6, 1.38.4, and 1.39.1, Envoy's URL normalization does not recognize dot and dotdot path segments when they carry semicolon parameters. A request such as /user/..;foo=bar/admin is therefore not canonicalized to /admin even when path normalization is enabled. If an upstream interprets the segment according to RFC 3986 while Envoy applies routing or RBAC to the uncollapsed path, a remote client can cause path confusion and bypass path-based security policy. The relevant scope boundary is that the security consequence depends on a downstream/upstream path interpretation mismatch or a path-based Envoy decision. This issue is fixed in versions 1.36.10, 1.37.6, 1.38.4, and 1.39.1.","evidence":"cve:CVE-2026-73551","products":[{"name":{"value":"envoy","evidence":"/containers/cna/affected/0/product"},"prerequisites":[],"fixed_versions":[],"affected_versions":[]}],"severity":"medium","structured":{"id":"CVE-2026-73551","aliases":["CVE-2026-73551"],"metrics":[{"cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":5.3,"attackVector":"NETWORK","baseSeverity":"MEDIUM","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","integrityImpact":"NONE","userInteraction":"NONE","attackComplexity":"LOW","availabilityImpact":"NONE","privilegesRequired":"NONE","confidentialityImpact":"LOW"}}],"affected":[{"vendor":"envoyproxy","product":"envoy","versions":[{"status":"affected","version":"< 1.36.10"},{"status":"affected","version":">= 1.37.0, < 1.37.6"},{"status":"affected","version":">= 1.38.0, < 1.38.4"},{"status":"affected","version":">= 1.39.0, < 1.39.1"}]}],"modified":"2026-09-28T20:41:32.313Z","provider":"cve","references":["https://github.com/envoyproxy/envoy/security/advisories/GHSA-2w8w-rfw7-8gg4","https://github.com/envoyproxy/envoy/commit/28b6d60a6d96edeece121cac5be701eb46cc7f24","https://github.com/envoyproxy/envoy/commit/d40a68b0a30a003c4e0a9fd3af637f828b52c37b","https://github.com/envoyproxy/envoy/commit/e9d6c329f9a3ff19432bf39b60c601df7e3eda33","https://github.com/envoyproxy/envoy/commit/f74d1107c4f5c9679b66f7a03a6c5b75ddde1989","https://github.com/envoyproxy/envoy/releases/tag/v1.36.10","https://github.com/envoyproxy/envoy/releases/tag/v1.37.6","https://github.com/envoyproxy/envoy/releases/tag/v1.38.4","https://github.com/envoyproxy/envoy/releases/tag/v1.39.1"],"provider_metadata":{"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2026-73551","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"version":"2.0.3","timestamp":"2026-09-28T20:41:24.834794Z"}}}],"providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-09-28T20:41:32.313Z"}}],"cna":{"orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M","dateUpdated":"2026-09-21T20:17:02.620Z"}}},"related_cves":[{"value":"CVE-2026-73551","evidence":"/cveMetadata/cveId"}],"security_relevant":true,"severity_evidence":"/containers/cna/metrics"},"group_id":"advisory:f40eebb9-dfa7-4fb7-86e2-813ab78258d7","priority":{"reasons":[],"severity":"medium","linked_cves":[],"fix_available":false,"known_exploited":false,"publisher_severity":"medium"},"revision":1,"source_id":"core-cve","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-73551","advisory_id":"f40eebb9-dfa7-4fb7-86e2-813ab78258d7","event_types":["advisory"],"published_at":"2026-10-24T21:33:46.615952+00:00","technologies":["core-cve","envoy"],"context_update":false,"extraction_method":"structured","source_published_at":"2026-09-21T20:17:02.62+00:00","detail_url":"/advisories/advisory%3Af40eebb9-dfa7-4fb7-86e2-813ab78258d7","group":{"id":"advisory:f40eebb9-dfa7-4fb7-86e2-813ab78258d7","revision":1,"primary_event_id":3341,"change":"published","superseded_by":[],"changed":{"id":3341,"cve_ids":["CVE-2026-73551"],"payload":{"kind":"advisory","title":"Envoy: Path normalization does not handle dot and dotdot segments with parameters","summary":"Envoy is an open source edge and service proxy designed for cloud-native applications. Prior to 1.36.10, 1.37.6, 1.38.4, and 1.39.1, Envoy's URL normalization does not recognize dot and dotdot path segments when they carry semicolon parameters. A request such as /user/..;foo=bar/admin is therefore not canonicalized to /admin even when path normalization is enabled. If an upstream interprets the segment according to RFC 3986 while Envoy applies routing or RBAC to the uncollapsed path, a remote client can cause path confusion and bypass path-based security policy. The relevant scope boundary is that the security consequence depends on a downstream/upstream path interpretation mismatch or a path-based Envoy decision. This issue is fixed in versions 1.36.10, 1.37.6, 1.38.4, and 1.39.1.","evidence":"cve:CVE-2026-73551","products":[{"name":{"value":"envoy","evidence":"/containers/cna/affected/0/product"},"prerequisites":[],"fixed_versions":[],"affected_versions":[]}],"severity":"medium","structured":{"id":"CVE-2026-73551","aliases":["CVE-2026-73551"],"metrics":[{"cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":5.3,"attackVector":"NETWORK","baseSeverity":"MEDIUM","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","integrityImpact":"NONE","userInteraction":"NONE","attackComplexity":"LOW","availabilityImpact":"NONE","privilegesRequired":"NONE","confidentialityImpact":"LOW"}}],"affected":[{"vendor":"envoyproxy","product":"envoy","versions":[{"status":"affected","version":"< 1.36.10"},{"status":"affected","version":">= 1.37.0, < 1.37.6"},{"status":"affected","version":">= 1.38.0, < 1.38.4"},{"status":"affected","version":">= 1.39.0, < 1.39.1"}]}],"modified":"2026-09-28T20:41:32.313Z","provider":"cve","references":["https://github.com/envoyproxy/envoy/security/advisories/GHSA-2w8w-rfw7-8gg4","https://github.com/envoyproxy/envoy/commit/28b6d60a6d96edeece121cac5be701eb46cc7f24","https://github.com/envoyproxy/envoy/commit/d40a68b0a30a003c4e0a9fd3af637f828b52c37b","https://github.com/envoyproxy/envoy/commit/e9d6c329f9a3ff19432bf39b60c601df7e3eda33","https://github.com/envoyproxy/envoy/commit/f74d1107c4f5c9679b66f7a03a6c5b75ddde1989","https://github.com/envoyproxy/envoy/releases/tag/v1.36.10","https://github.com/envoyproxy/envoy/releases/tag/v1.37.6","https://github.com/envoyproxy/envoy/releases/tag/v1.38.4","https://github.com/envoyproxy/envoy/releases/tag/v1.39.1"],"provider_metadata":{"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2026-73551","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"version":"2.0.3","timestamp":"2026-09-28T20:41:24.834794Z"}}}],"providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-09-28T20:41:32.313Z"}}],"cna":{"orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M","dateUpdated":"2026-09-21T20:17:02.620Z"}}},"related_cves":[{"value":"CVE-2026-73551","evidence":"/cveMetadata/cveId"}],"security_relevant":true,"severity_evidence":"/containers/cna/metrics"},"group_id":"advisory:f40eebb9-dfa7-4fb7-86e2-813ab78258d7","priority":{"reasons":[],"severity":"medium","linked_cves":[],"fix_available":false,"known_exploited":false,"publisher_severity":"medium"},"revision":1,"source_id":"core-cve","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-73551","advisory_id":"f40eebb9-dfa7-4fb7-86e2-813ab78258d7","event_types":["advisory"],"published_at":"2026-10-24T21:33:46.615952+00:00","technologies":["core-cve","envoy"],"context_update":false,"extraction_method":"structured","source_published_at":"2026-09-21T20:17:02.62+00:00","detail_url":"/events/3341"},"members":[{"id":3341,"cve_ids":["CVE-2026-73551"],"payload":{"kind":"advisory","title":"Envoy: Path normalization does not handle dot and dotdot segments with parameters","summary":"Envoy is an open source edge and service proxy designed for cloud-native applications. Prior to 1.36.10, 1.37.6, 1.38.4, and 1.39.1, Envoy's URL normalization does not recognize dot and dotdot path segments when they carry semicolon parameters. A request such as /user/..;foo=bar/admin is therefore not canonicalized to /admin even when path normalization is enabled. If an upstream interprets the segment according to RFC 3986 while Envoy applies routing or RBAC to the uncollapsed path, a remote client can cause path confusion and bypass path-based security policy. The relevant scope boundary is that the security consequence depends on a downstream/upstream path interpretation mismatch or a path-based Envoy decision. This issue is fixed in versions 1.36.10, 1.37.6, 1.38.4, and 1.39.1.","evidence":"cve:CVE-2026-73551","products":[{"name":{"value":"envoy","evidence":"/containers/cna/affected/0/product"},"prerequisites":[],"fixed_versions":[],"affected_versions":[]}],"severity":"medium","structured":{"id":"CVE-2026-73551","aliases":["CVE-2026-73551"],"metrics":[{"cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":5.3,"attackVector":"NETWORK","baseSeverity":"MEDIUM","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","integrityImpact":"NONE","userInteraction":"NONE","attackComplexity":"LOW","availabilityImpact":"NONE","privilegesRequired":"NONE","confidentialityImpact":"LOW"}}],"affected":[{"vendor":"envoyproxy","product":"envoy","versions":[{"status":"affected","version":"< 1.36.10"},{"status":"affected","version":">= 1.37.0, < 1.37.6"},{"status":"affected","version":">= 1.38.0, < 1.38.4"},{"status":"affected","version":">= 1.39.0, < 1.39.1"}]}],"modified":"2026-09-28T20:41:32.313Z","provider":"cve","references":["https://github.com/envoyproxy/envoy/security/advisories/GHSA-2w8w-rfw7-8gg4","https://github.com/envoyproxy/envoy/commit/28b6d60a6d96edeece121cac5be701eb46cc7f24","https://github.com/envoyproxy/envoy/commit/d40a68b0a30a003c4e0a9fd3af637f828b52c37b","https://github.com/envoyproxy/envoy/commit/e9d6c329f9a3ff19432bf39b60c601df7e3eda33","https://github.com/envoyproxy/envoy/commit/f74d1107c4f5c9679b66f7a03a6c5b75ddde1989","https://github.com/envoyproxy/envoy/releases/tag/v1.36.10","https://github.com/envoyproxy/envoy/releases/tag/v1.37.6","https://github.com/envoyproxy/envoy/releases/tag/v1.38.4","https://github.com/envoyproxy/envoy/releases/tag/v1.39.1"],"provider_metadata":{"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2026-73551","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"version":"2.0.3","timestamp":"2026-09-28T20:41:24.834794Z"}}}],"providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-09-28T20:41:32.313Z"}}],"cna":{"orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M","dateUpdated":"2026-09-21T20:17:02.620Z"}}},"related_cves":[{"value":"CVE-2026-73551","evidence":"/cveMetadata/cveId"}],"security_relevant":true,"severity_evidence":"/containers/cna/metrics"},"group_id":"advisory:f40eebb9-dfa7-4fb7-86e2-813ab78258d7","priority":{"reasons":[],"severity":"medium","linked_cves":[],"fix_available":false,"known_exploited":false,"publisher_severity":"medium"},"revision":1,"source_id":"core-cve","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-73551","advisory_id":"f40eebb9-dfa7-4fb7-86e2-813ab78258d7","event_types":["advisory"],"published_at":"2026-10-24T21:33:46.615952+00:00","technologies":["core-cve","envoy"],"context_update":false,"extraction_method":"structured","source_published_at":"2026-09-21T20:17:02.62+00:00","detail_url":"/events/3341"}]}},{"id":3327,"cve_ids":["CVE-2026-73550"],"payload":{"kind":"advisory","title":"Envoy: HTTP/2 Discarded Host Header 200 GB Header-Copy OOM in Envoy","summary":"Envoy is an open source edge and service proxy designed for cloud-native applications. Prior to 1.36.10, 1.37.6, 1.38.4, and 1.39.1, Envoy copies every decoded HTTP/2 Host header value before discarding it when :authority is already present. The discarded value bypasses saveHeader, so its bytes and count are not charged against request header limits. An unauthenticated client can use HPACK indexing to submit many references to a large Host value across a bounded number of streams, forcing extreme header-copy allocation and causing the proxy to be out-of-memory killed. The relevant scope boundary is that the demonstrated amplification uses HTTP/2 HPACK and the duplicate Host discard behavior. This issue is fixed in versions 1.36.10, 1.37.6, 1.38.4, and 1.39.1.","evidence":"cve:CVE-2026-73550","products":[{"name":{"value":"envoy","evidence":"/containers/cna/affected/0/product"},"prerequisites":[],"fixed_versions":[],"affected_versions":[]}],"severity":"high","structured":{"id":"CVE-2026-73550","aliases":["CVE-2026-73550"],"metrics":[{"cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":7.5,"attackVector":"NETWORK","baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","integrityImpact":"NONE","userInteraction":"NONE","attackComplexity":"LOW","availabilityImpact":"HIGH","privilegesRequired":"NONE","confidentialityImpact":"NONE"}}],"affected":[{"vendor":"envoyproxy","product":"envoy","versions":[{"status":"affected","version":"< 1.36.10"},{"status":"affected","version":">= 1.37.0, < 1.37.6"},{"status":"affected","version":">= 1.38.0, < 1.38.4"},{"status":"affected","version":">= 1.39.0, < 1.39.1"}]}],"modified":"2026-09-28T20:37:02.865Z","provider":"cve","references":["https://github.com/envoyproxy/envoy/security/advisories/GHSA-qgf6-qvhw-4hvh","https://github.com/envoyproxy/envoy/commit/0910997f70e91d2d20c329bb507bfce44ce01f80","https://github.com/envoyproxy/envoy/commit/1fec994c868df008cdd4ae285aab58a196fd31f2","https://github.com/envoyproxy/envoy/commit/3fd0ffee7ac87adf3bc6e421656bb96310512300","https://github.com/envoyproxy/envoy/commit/fc75d8e35b0d11acbae18b63a0bd96e32e84f61b","https://github.com/envoyproxy/envoy/releases/tag/v1.36.10","https://github.com/envoyproxy/envoy/releases/tag/v1.37.6","https://github.com/envoyproxy/envoy/releases/tag/v1.38.4","https://github.com/envoyproxy/envoy/releases/tag/v1.39.1"],"provider_metadata":{"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2026-73550","role":"CISA Coordinator","options":[{"Exploitation":"poc"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"version":"2.0.3","timestamp":"2026-09-28T20:36:57.251407Z"}}}],"references":[{"url":"https://github.com/envoyproxy/envoy/security/advisories/GHSA-qgf6-qvhw-4hvh","tags":["exploit"]}],"providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-09-28T20:37:02.865Z"}}],"cna":{"orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M","dateUpdated":"2026-09-21T19:49:28.641Z"}}},"related_cves":[{"value":"CVE-2026-73550","evidence":"/cveMetadata/cveId"}],"security_relevant":true,"severity_evidence":"/containers/cna/metrics"},"group_id":"advisory:16db6b15-0899-48c9-81d8-1992ed8c4455","priority":{"reasons":["publisher_severity"],"severity":"high","linked_cves":[],"fix_available":false,"known_exploited":false,"publisher_severity":"high"},"revision":1,"source_id":"core-cve","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-73550","advisory_id":"16db6b15-0899-48c9-81d8-1992ed8c4455","event_types":["advisory"],"published_at":"2026-10-24T21:33:46.04683+00:00","technologies":["core-cve","envoy"],"context_update":false,"extraction_method":"structured","source_published_at":"2026-09-21T19:49:28.641+00:00","detail_url":"/advisories/advisory%3A16db6b15-0899-48c9-81d8-1992ed8c4455","group":{"id":"advisory:16db6b15-0899-48c9-81d8-1992ed8c4455","revision":1,"primary_event_id":3340,"change":"published","superseded_by":[],"changed":{"id":3340,"cve_ids":["CVE-2026-73550"],"payload":{"kind":"advisory","title":"Envoy: HTTP/2 Discarded Host Header 200 GB Header-Copy OOM in Envoy","summary":"Envoy is an open source edge and service proxy designed for cloud-native applications. Prior to 1.36.10, 1.37.6, 1.38.4, and 1.39.1, Envoy copies every decoded HTTP/2 Host header value before discarding it when :authority is already present. The discarded value bypasses saveHeader, so its bytes and count are not charged against request header limits. An unauthenticated client can use HPACK indexing to submit many references to a large Host value across a bounded number of streams, forcing extreme header-copy allocation and causing the proxy to be out-of-memory killed. The relevant scope boundary is that the demonstrated amplification uses HTTP/2 HPACK and the duplicate Host discard behavior. This issue is fixed in versions 1.36.10, 1.37.6, 1.38.4, and 1.39.1.","evidence":"cve:CVE-2026-73550","products":[{"name":{"value":"envoy","evidence":"/containers/cna/affected/0/product"},"prerequisites":[],"fixed_versions":[],"affected_versions":[]}],"severity":"high","structured":{"id":"CVE-2026-73550","aliases":["CVE-2026-73550"],"metrics":[{"cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":7.5,"attackVector":"NETWORK","baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","integrityImpact":"NONE","userInteraction":"NONE","attackComplexity":"LOW","availabilityImpact":"HIGH","privilegesRequired":"NONE","confidentialityImpact":"NONE"}}],"affected":[{"vendor":"envoyproxy","product":"envoy","versions":[{"status":"affected","version":"< 1.36.10"},{"status":"affected","version":">= 1.37.0, < 1.37.6"},{"status":"affected","version":">= 1.38.0, < 1.38.4"},{"status":"affected","version":">= 1.39.0, < 1.39.1"}]}],"modified":"2026-09-28T20:37:02.865Z","provider":"cve","references":["https://github.com/envoyproxy/envoy/security/advisories/GHSA-qgf6-qvhw-4hvh","https://github.com/envoyproxy/envoy/commit/0910997f70e91d2d20c329bb507bfce44ce01f80","https://github.com/envoyproxy/envoy/commit/1fec994c868df008cdd4ae285aab58a196fd31f2","https://github.com/envoyproxy/envoy/commit/3fd0ffee7ac87adf3bc6e421656bb96310512300","https://github.com/envoyproxy/envoy/commit/fc75d8e35b0d11acbae18b63a0bd96e32e84f61b","https://github.com/envoyproxy/envoy/releases/tag/v1.36.10","https://github.com/envoyproxy/envoy/releases/tag/v1.37.6","https://github.com/envoyproxy/envoy/releases/tag/v1.38.4","https://github.com/envoyproxy/envoy/releases/tag/v1.39.1"],"provider_metadata":{"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2026-73550","role":"CISA Coordinator","options":[{"Exploitation":"poc"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"version":"2.0.3","timestamp":"2026-09-28T20:36:57.251407Z"}}}],"references":[{"url":"https://github.com/envoyproxy/envoy/security/advisories/GHSA-qgf6-qvhw-4hvh","tags":["exploit"]}],"providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-09-28T20:37:02.865Z"}}],"cna":{"orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M","dateUpdated":"2026-09-21T19:49:28.641Z"}}},"related_cves":[{"value":"CVE-2026-73550","evidence":"/cveMetadata/cveId"}],"security_relevant":true,"severity_evidence":"/containers/cna/metrics"},"group_id":"advisory:16db6b15-0899-48c9-81d8-1992ed8c4455","priority":{"reasons":["publisher_severity"],"severity":"high","linked_cves":[],"fix_available":false,"known_exploited":false,"publisher_severity":"high"},"revision":1,"source_id":"core-cve","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-73550","advisory_id":"16db6b15-0899-48c9-81d8-1992ed8c4455","event_types":["advisory"],"published_at":"2026-10-24T21:33:46.04683+00:00","technologies":["core-cve","envoy"],"context_update":false,"extraction_method":"structured","source_published_at":"2026-09-21T19:49:28.641+00:00","detail_url":"/events/3340"},"members":[{"id":3340,"cve_ids":["CVE-2026-73550"],"payload":{"kind":"advisory","title":"Envoy: HTTP/2 Discarded Host Header 200 GB Header-Copy OOM in Envoy","summary":"Envoy is an open source edge and service proxy designed for cloud-native applications. Prior to 1.36.10, 1.37.6, 1.38.4, and 1.39.1, Envoy copies every decoded HTTP/2 Host header value before discarding it when :authority is already present. The discarded value bypasses saveHeader, so its bytes and count are not charged against request header limits. An unauthenticated client can use HPACK indexing to submit many references to a large Host value across a bounded number of streams, forcing extreme header-copy allocation and causing the proxy to be out-of-memory killed. The relevant scope boundary is that the demonstrated amplification uses HTTP/2 HPACK and the duplicate Host discard behavior. 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Prior to 1.36.10, 1.37.6, 1.38.4, and 1.39.1, Envoy forwards data for a configured non-WebSocket HTTP upgrade before the upstream accepts the upgrade. An unauthenticated HTTP/2 client can place a complete HTTP/1.1 request in extended CONNECT data; Envoy downgrades the request, writes the data unframed to a keep-alive HTTP/1.1 upstream, and returns the socket to the shared pool while the smuggled response remains queued. A different downstream client can then receive the attacker's response. The relevant scope boundary is that webSocket upgrades, plain CONNECT, disabled backend keep-alive, per-downstream pools, and max_requests_per_connection set to 1 are not affected by the demonstrated path. 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