EUVD-2026-70246Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Primary rating from Vendor (GitHub_M) · only source for this CVE.
CVSS VectorVendor: GitHub_M
Lifecycle Timeline
3DescriptionCVE.org
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.
AnalysisAI
CRLF injection in httpx2 (pydantic's next-generation Python HTTP client) before v2.11.0 allows manipulation of multipart/form-data part headers when attacker-controlled data reaches the content_type or custom headers fields of the files= parameter. FileField.render_headers() in _multipart.py interpolates these values directly into raw header bytes without stripping CR or LF characters, enabling injection of fabricated headers into multipart parts. …
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