{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-84379", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-09-01T16:27:58.130Z", "datePublished": "2026-09-02T17:57:17.092Z", "dateUpdated": "2026-09-02T18:20:46.599Z"}, "containers": {"cna": {"title": "HTTPX2: Multipart part header injection via unvalidated file Content-Type and custom headers", "problemTypes": [{"descriptions": [{"cweId": "CWE-93", "lang": "en", "description": "CWE-93: Improper Neutralization of CRLF Sequences ('CRLF Injection')", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 5.3, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N", "version": "3.1"}}], "references": [{"name": "https://github.com/pydantic/httpx2/security/advisories/GHSA-h4x7-gw46-3wm6", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/pydantic/httpx2/security/advisories/GHSA-h4x7-gw46-3wm6"}, {"name": "https://github.com/pydantic/httpx2/pull/1142", "tags": ["x_refsource_MISC"], "url": "https://github.com/pydantic/httpx2/pull/1142"}, {"name": "https://github.com/pydantic/httpx2/commit/de96d810ee4e309d118982fe7084a46a2bcd600d", "tags": ["x_refsource_MISC"], "url": "https://github.com/pydantic/httpx2/commit/de96d810ee4e309d118982fe7084a46a2bcd600d"}, {"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": "2026-09-02T17:57:17.092Z"}, "descriptions": [{"lang": "en", "value": "HTTPX2 is a next generation HTTP client for Python. Prior to 2.11.0, FileField.render_headers() in src/httpx2/httpx2/_multipart.py directly interpolates attacker-controlled content_type values and custom headers from the files= three-element (filename, content, content_type) tuple and the files= four-element (filename, content, content_type, headers) tuple into multipart/form-data part headers without validating header names or values. CR or LF characters can terminate a part header, inject additional part headers, or end the part header block early, allowing a downstream multipart parser to treat attacker-supplied lines as genuine headers and potentially alter part semantics or bypass header-based checks. This issue is fixed in version 2.11.0."}], "source": {"advisory": "GHSA-h4x7-gw46-3wm6", "discovery": "UNKNOWN"}}, "adp": [{"references": [{"url": "https://github.com/pydantic/httpx2/security/advisories/GHSA-h4x7-gw46-3wm6", "tags": ["exploit"]}], "metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-09-02T18:20:04.628894Z", "id": "CVE-2026-84379", "options": [{"Exploitation": "poc"}, {"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": "2026-09-02T18:20:46.599Z"}}]}}

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{"affected": [{"affectedData": [{"product": "httpx2", "vendor": "pydantic", "versions": [{"status": "affected", "version": "< 2.11.0"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "HTTPX2 is a next generation HTTP client for Python. Prior to 2.11.0, FileField.render_headers() in src/httpx2/httpx2/_multipart.py directly interpolates attacker-controlled content_type values and custom headers from the files= three-element (filename, content, content_type) tuple and the files= four-element (filename, content, content_type, headers) tuple into multipart/form-data part headers without validating header names or values. CR or LF characters can terminate a part header, inject additional part headers, or end the part header block early, allowing a downstream multipart parser to treat attacker-supplied lines as genuine headers and potentially alter part semantics or bypass header-based checks. This issue is fixed in version 2.11.0."}], "id": "CVE-2026-84379", "lastModified": "2026-09-02T19:18:08.010", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 5.3, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 1.4, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-84379", "options": [{"exploitation": "poc"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-09-02T18:20:04.628894Z", "version": "2.0.3"}}]}, "published": "2026-09-02T18:21:29.300", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/pydantic/httpx2/commit/de96d810ee4e309d118982fe7084a46a2bcd600d"}, {"source": "security-advisories@github.com", "url": "https://github.com/pydantic/httpx2/pull/1142"}, {"source": "security-advisories@github.com", "url": "https://github.com/pydantic/httpx2/releases/tag/v2.11.0"}, {"source": "security-advisories@github.com", "url": "https://github.com/pydantic/httpx2/security/advisories/GHSA-h4x7-gw46-3wm6"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "url": "https://github.com/pydantic/httpx2/security/advisories/GHSA-h4x7-gw46-3wm6"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-93"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

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