CVE-2026-84379
Publication date 3 September 2026
Last updated 4 September 2026
Ubuntu priority
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.
Status
| Package | Ubuntu Release | Status |
|---|---|---|
| python-httpx2 | 26.04 LTS resolute | Not in release |
| 24.04 LTS noble | Not in release | |
| 22.04 LTS jammy | Not in release |
Severity score breakdown
CVSS version: CVSS v3.0
Base score
5.3 · Medium
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
References
Other references
- https://www.cve.org/CVERecord?id=CVE-2026-84379
- https://github.com/pydantic/httpx2/security/advisories/GHSA-h4x7-gw46-3wm6
- https://github.com/pydantic/httpx2/pull/1142
- https://github.com/pydantic/httpx2/commit/de96d810ee4e309d118982fe7084a46a2bcd600d
- https://github.com/pydantic/httpx2/releases/tag/v2.11.0