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.

INFO

Published Date :

2026-03-12T16:45:01.070Z

Last Modified :

2026-03-13T16:29:28.768Z

Source :

GitHub_M
AFFECTED PRODUCTS

The following products are affected by CVE-2026-28356 vulnerability.

Vendors Products
Defnull
  • Multipart
REFERENCES

Here, you will find a curated list of external links that provide in-depth information to CVE-2026-28356.

URL Resource
https://github.com/defnull/multipart/security/advisories/GHSA-p2m9-wcp5-6qw3 cve-icon cve-icon cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2026-28356 cve-icon
https://www.cve.org/CVERecord?id=CVE-2026-28356 cve-icon
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CVSS Vulnerability Scoring System

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