Vulnerability Description
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.
CVSS Score
MEDIUM
Related Weaknesses (CWE)
References
- https://github.com/pydantic/httpx2/commit/de96d810ee4e309d118982fe7084a46a2bcd60
- https://github.com/pydantic/httpx2/pull/1142
- https://github.com/pydantic/httpx2/releases/tag/v2.11.0
- https://github.com/pydantic/httpx2/security/advisories/GHSA-h4x7-gw46-3wm6
- https://github.com/pydantic/httpx2/security/advisories/GHSA-h4x7-gw46-3wm6
FAQ
What is CVE-2026-84379?
CVE-2026-84379 is a vulnerability with a CVSS score of 5.3 (MEDIUM). 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 cus...
How severe is CVE-2026-84379?
CVE-2026-84379 has been rated MEDIUM with a CVSS base score of 5.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-84379?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.