🛡️ CVE-2026-28356
🟠 CVSS 8.0 — High ✅ No Known Exploit CWE-1333 NVD
8.0
CVSS Score
0 Low4 Medium7 High9 Critical10

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.

Details

Severity HIGH
CVSS Score 8.0
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE CWE-1333
Public Exploit ✅ No
Source NVD
Published 2026-03-12
Updated 2026-06-15
Modified 2026-03-23
Fix URL N/A

Affected Packages

Software From version Fixed in
multipart — 1.2.2
unknown — —

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