CVE-2026-84379

{"id": "CVE-2026-84379", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-84379", "role": "CISA Coordinator", "options": [{"exploitation": "poc"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-09-02T18:20:04.628894Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "security-advisories@github.com", "cvssData": {"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:N/I:L/A:N", "integrityImpact": "LOW", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}, "impactScore": 1.4, "exploitabilityScore": 3.9}]}, "affected": [{"source": "security-advisories@github.com", "affectedData": [{"vendor": "pydantic", "product": "httpx2", "versions": [{"status": "affected", "version": "< 2.11.0"}]}]}], "published": "2026-09-02T18:21:29.300", "references": [{"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": "security-advisories@github.com"}, {"url": "https://github.com/pydantic/httpx2/security/advisories/GHSA-h4x7-gw46-3wm6", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"}], "vulnStatus": "Awaiting Analysis", "weaknesses": [{"type": "Secondary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-93"}]}], "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."}], "lastModified": "2026-09-09T21:05:23.237", "sourceIdentifier": "security-advisories@github.com"}