CVE-2026-84379
mediumHTTPX2 is a next generation HTTP client for Python.
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:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N Affected products
Not reported by the source (unknown — not "none").
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
No vendor advisory or patch reference tagged by NVD. Check the references below.
References
- https://github.com/pydantic/httpx2/commit/de96d810ee4e309d118982fe7084a46a2bcd600d security-advisories@github.com
- https://github.com/pydantic/httpx2/pull/1142 security-advisories@github.com
- https://github.com/pydantic/httpx2/releases/tag/v2.11.0 security-advisories@github.com
- https://github.com/pydantic/httpx2/security/advisories/GHSA-h4x7-gw46-3wm6 security-advisories@github.com
- https://github.com/pydantic/httpx2/security/advisories/GHSA-h4x7-gw46-3wm6 134c704f-9b21-4f2e-91b3-4a467353bcc0