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CVE-2026-42561

7.5 · HIGH

Python-Multipart is a streaming multipart parser for Python.

Published May 13, 2026CWE-770EPSS 0.85%

Overview

CVE-2026-42561 is a high-severity vulnerability. It was published on May 13, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/Kludex/python-multipart/security/advisories/GHSA-pp6c-gr5w-3c5gRefaccess.redhat.com/errata/RHSA-2026:37275Refaccess.redhat.com/errata/RHSA-2026:42132Refaccess.redhat.com/errata/RHSA-2026:42142Refaccess.redhat.com/errata/RHSA-2026:43038Refaccess.redhat.com/errata/RHSA-2026:44696Refaccess.redhat.com/errata/RHSA-2026:51194Refaccess.redhat.com/errata/RHSA-2026:51219Refaccess.redhat.com/errata/RHSA-2026:51357Refaccess.redhat.com/security/cve/CVE-2026-42561

How CyberStrike helps

Frequently asked questions

What is CVE-2026-42561?

CVE-2026-42561 is a high-severity vulnerability. It was published on May 13, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-42561?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-42561?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-42561?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-42561 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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