{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-84380","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","state":"PUBLISHED","assignerShortName":"GitHub_M","dateReserved":"2026-09-01T16:27:58.130Z","datePublished":"2026-09-02T17:58:55.520Z","dateUpdated":"2026-09-02T18:07:36.980Z"},"containers":{"cna":{"title":"HTTPX2: Conflicting Content-Length and Transfer-Encoding headers can be auto-generated","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":"LOW","baseScore":5.6,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L","version":"3.1"}}],"references":[{"name":"https://github.com/pydantic/httpx2/security/advisories/GHSA-pf96-p4fj-6566","tags":["x_refsource_CONFIRM"],"url":"https://github.com/pydantic/httpx2/security/advisories/GHSA-pf96-p4fj-6566"},{"name":"https://github.com/pydantic/httpx2/pull/1137","tags":["x_refsource_MISC"],"url":"https://github.com/pydantic/httpx2/pull/1137"},{"name":"https://github.com/pydantic/httpx2/commit/829b93a2393212996f613e635261f777d9ec6eab","tags":["x_refsource_MISC"],"url":"https://github.com/pydantic/httpx2/commit/829b93a2393212996f613e635261f777d9ec6eab"},{"name":"https://github.com/pydantic/httpx2/releases/tag/v2.11.0","tags":["x_refsource_MISC"],"url":"https://github.com/pydantic/httpx2/releases/tag/v2.11.0"}],"affected":[{"vendor":"pydantic","product":"httpx2","versions":[{"version":"< 2.11.0","status":"affected"}]}],"providerMetadata":{"orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M","dateUpdated":"2026-09-02T17:58:55.520Z"},"descriptions":[{"lang":"en","value":"HTTPX2 is a next generation HTTP client for Python. Prior to 2.11.0, Request._prepare() in src/httpx2/httpx2/_models.py can add a body-derived Content-Length header to a request that already contains a caller-supplied Transfer-Encoding header because its setdefault() processing checks each default header independently rather than treating the two framing headers as mutually exclusive. Fixed-size byte, JSON, form, and known-length multipart bodies can therefore be serialized over HTTP/1.1 with both headers, allowing request smuggling or connection desynchronization when downstream intermediaries disagree about which framing header takes precedence. This issue is fixed in version 2.11.0."}],"source":{"advisory":"GHSA-pf96-p4fj-6566","discovery":"UNKNOWN"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-09-02T18:07:09.850518Z","id":"CVE-2026-84380","options":[{"Exploitation":"none"},{"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":"2026-09-02T18:07:36.980Z"}}]}}