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High severity7.5NVD Advisory· Published May 13, 2026· Updated Aug 7, 2026

CVE-2026-42561

CVE-2026-42561

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.

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Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
python-multipartPyPI
< 0.0.270.0.27

Affected products

18

Patches

Vulnerability mechanics

References

14

News mentions

0

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