CVE-2026-42561

python-multipart: Python-Multipart is a streaming multipart parser for Python

CVE-2026-42561 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2026-42561, released May 13, 2026. It is not reported as exploited. Patch Radar priority: High.

High
CVSS
7.5
high
Exploitation
None reported
No vendor assessment
CISA KEV
Not listed
Not in the Known Exploited Vulnerabilities catalog
EPSS
0.0074
54th percentile

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.

Where it's fixed

ProductFixed inFixReleased
Linux
python-multipart · Debian 14 0.0.32-1 DEBIAN-CVE-2026-42561 May 13, 2026
python-python-multipart · sles 16.0 0.0.20-160000.4.1 SUSE-SU-2026:21999-1 May 29, 2026

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