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 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.

CVSS v3 7.5 HIGH

7.5^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://github.com/Kludex/python-multipart/security/advisories/GHSA-pp6c-gr5w-3c5g
https://access.redhat.com/errata/RHSA-2026:37275
https://access.redhat.com/errata/RHSA-2026:42132
https://access.redhat.com/errata/RHSA-2026:42142
https://access.redhat.com/errata/RHSA-2026:43038
https://access.redhat.com/errata/RHSA-2026:44696
https://access.redhat.com/errata/RHSA-2026:51194
https://access.redhat.com/errata/RHSA-2026:51219
https://access.redhat.com/errata/RHSA-2026:51357
https://access.redhat.com/security/cve/CVE-2026-42561
https://bugzilla.redhat.com/show_bug.cgi?id=2477309
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42561.json

Configurations

No configuration.

History

No history.

Information

Published : 2026-05-13 21:16

Updated : 2026-08-07 12:17

NVD link : CVE-2026-42561

Mitre link : CVE-2026-42561

CVE.ORG link : CVE-2026-42561

JSON object : View

Products Affected

No product.

CWE

CWE-770

Allocation of Resources Without Limits or Throttling

CWE-606

Unchecked Input for Loop Condition

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