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NVD description
multipart is a fast multipart/form-data parser for python. Prior to 1.2.2, 1.3.1 and 1.4.0-dev, the parse_options_header() function in multipart.py uses a regular expression with an ambiguous alternation, which can cause exponential backtracking (ReDoS) when parsing maliciously crafted HTTP or multipart segment headers. This can be abused for denial of service (DoS) attacks against web applications using this library to parse request headers or multipart/form-data streams. The issue is fixed in 1.2.2, 1.3.1 and 1.4.0-dev.
Priority
LOW
Exploitation
NONE
PoC
NONE
Patch
NONE
Momentum
NONE
CVE-2026-28356 multipart is a fast multipart/form-data parser for python. Prior to 1.2.2, 1.3.1 and 1.4.0-dev, the parse_options_header() function in http://multipart.py uses a regular exp… https://www.cve.org/CVERecord?id=CVE-2026-28356
Post summary
The text discloses CVE‑2026‑28356, a vulnerability in multipart.py’s parse_options_header() affecting versions prior to 1.2.2, 1.3.1, and 1.4.0‑dev, and notes a regular‑expression issue.