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Vulnerabilities CVE-2026-42561

CVE-2026-42561

High
Open
TLP:CLEAR

Python-Multipart: Denial of Service via unbounded multipart part headers

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Description

Python-Multipart is a streaming multipart parser for Python. Prior to 0.0.27, python-multipart has a denial of service vulnerability in multipart part header parsing. When parsing multipart/form-data, MultipartParser previously had no limit on the number of part headers or the size of an individual part header. An attacker could send a request with either many repeated headers without terminating the header block or a single very large header value, causing excessive CPU work before request rejection or completion. This vulnerability is fixed in 0.0.27.

Details

CVSS Score
7.5
EPSS Score
0.74%

51.4th percentile

CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Confidence
90%
Published
May 13, 2026
Last Modified
Aug 7, 2026
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