What is CVE-2026-42561?

CVE-2026-42561 is a high-severity vulnerability in Kludex Python-multipart, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 7.5/10. Published 2026-05-13.

How severe is CVE-2026-42561?

High severity. CVSS v3 base score is 7.5 out of 10.

Resource exhaustion in Kludex Python-multipart

CVE-2026-42561

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 limi…

EPSS: 0.001 (21.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Kludex Python-multipart — versions < 0.0.27

Weakness classification (CWE)

CWE-770 — Allocation of Resources Without Limits or Throttling

References

security-advisories@github.com (x_refsource_CONFIRM)

Frequently asked questions

What is CVE-2026-42561?: CVE-2026-42561 is a high-severity vulnerability in Kludex Python-multipart, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 7.5/10. Published 2026-05-13.
How severe is CVE-2026-42561?: High severity. CVSS v3 base score is 7.5 out of 10.