{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2025-57804","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","state":"PUBLISHED","assignerShortName":"GitHub_M","dateReserved":"2025-08-20T14:30:35.009Z","datePublished":"2025-08-25T21:04:52.642Z","dateUpdated":"2025-11-03T18:13:44.839Z"},"containers":{"cna":{"title":"h2 allows HTTP Request Smuggling due to illegal characters in headers","problemTypes":[{"descriptions":[{"cweId":"CWE-93","lang":"en","description":"CWE-93: Improper Neutralization of CRLF Sequences ('CRLF Injection')","type":"CWE"}]}],"metrics":[{"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE","vulnAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"LOW","subAvailabilityImpact":"NONE","baseScore":6.9,"baseSeverity":"MEDIUM","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N","version":"4.0"}}],"references":[{"name":"https://github.com/python-hyper/h2/security/advisories/GHSA-847f-9342-265h","tags":["x_refsource_CONFIRM"],"url":"https://github.com/python-hyper/h2/security/advisories/GHSA-847f-9342-265h"},{"name":"https://github.com/python-hyper/h2/commit/035e9899f95e3709af098f578bfc3cd302298e3a","tags":["x_refsource_MISC"],"url":"https://github.com/python-hyper/h2/commit/035e9899f95e3709af098f578bfc3cd302298e3a"}],"affected":[{"vendor":"python-hyper","product":"h2","versions":[{"version":"< 4.3.0","status":"affected"}]}],"providerMetadata":{"orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M","dateUpdated":"2025-08-25T21:04:52.642Z"},"descriptions":[{"lang":"en","value":"h2 is a pure-Python implementation of a HTTP/2 protocol stack. Prior to version 4.3.0, an HTTP/2 request splitting vulnerability allows attackers to perform request smuggling attacks by injecting CRLF characters into headers. This occurs when servers downgrade HTTP/2 requests to HTTP/1.1 without properly validating header names/values, enabling attackers to manipulate request boundaries and bypass security controls. This issue has been patched in version 4.3.0."}],"source":{"advisory":"GHSA-847f-9342-265h","discovery":"UNKNOWN"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2025-08-26T19:14:14.359281Z","id":"CVE-2025-57804","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"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":"2025-08-26T19:14:49.643Z"}},{"title":"CVE Program Container","references":[{"url":"https://lists.debian.org/debian-lts-announce/2025/09/msg00004.html"}],"providerMetadata":{"orgId":"af854a3a-2127-422b-91ae-364da2661108","shortName":"CVE","dateUpdated":"2025-11-03T18:13:44.839Z"}}]}}