{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-48743","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","state":"PUBLISHED","assignerShortName":"GitHub_M","dateReserved":"2026-05-22T19:10:35.747Z","datePublished":"2026-06-26T17:34:22.470Z","dateUpdated":"2026-06-29T15:20:33.276Z"},"containers":{"cna":{"title":"Envoy: HTTP/3 to HTTP/1 request smuggling via headers-only request with nonzero Content-Length","problemTypes":[{"descriptions":[{"cweId":"CWE-444","lang":"en","description":"CWE-444: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')","type":"CWE"}]}],"metrics":[{"cvssV3_1":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"LOW","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:H/A:N","version":"3.1"}}],"references":[{"name":"https://github.com/envoyproxy/envoy/security/advisories/GHSA-8phg-2h2q-jgxf","tags":["x_refsource_CONFIRM"],"url":"https://github.com/envoyproxy/envoy/security/advisories/GHSA-8phg-2h2q-jgxf"}],"affected":[{"vendor":"envoyproxy","product":"envoy","versions":[{"version":">= 1.38.0, < 1.38.1","status":"affected"},{"version":">= 1.37.0, < 1.37.3","status":"affected"},{"version":">= 1.36.0, < 1.36.7","status":"affected"},{"version":">= 1.35.0, < 1.35.11","status":"affected"}]}],"providerMetadata":{"orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M","dateUpdated":"2026-06-26T17:34:22.470Z"},"descriptions":[{"lang":"en","value":"Envoy is an open source edge and service proxy designed for cloud-native applications. Prior to 1.35.11, 1.36.7, 1.37.3, and 1.38.1, Envoy can translate a downstream HTTP/3 request that is complete at the transport layer (HEADERS with FIN / headers-only close) but still carries a nonzero Content-Length into a complete upstream HTTP/1 request with unresolved body debt. In an HTTP/1 upstream deployment where the origin replies before reading the declared body and keeps the connection reusable, the beginning of the next Envoy-generated upstream request can be consumed as the first request's body. The remaining bytes are then parsed by the origin as a new HTTP/1 request. This was reproduced as a route-bypass/desync: direct /pwn was denied by Envoy, but the second downstream H3 stream received the response for backend-parsed GET /pwn HTTP/1.1. This vulnerability is fixed in 1.35.11, 1.36.7, 1.37.3, and 1.38.1."}],"source":{"advisory":"GHSA-8phg-2h2q-jgxf","discovery":"UNKNOWN"}},"adp":[{"references":[{"url":"https://github.com/envoyproxy/envoy/security/advisories/GHSA-8phg-2h2q-jgxf","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-06-29T15:04:55.378026Z","id":"CVE-2026-48743","options":[{"Exploitation":"poc"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-06-29T15:20:33.276Z"}}]}}