Upstream information

CVE-2026-42561 at MITRE

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.

SUSE information

Overall state of this security issue: Pending

This issue is currently rated as having important severity.

CVSS v3 Scores
CVSS detail CNA (GitHub) SUSE
Base Score 7.5 7.5
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector Network Network
Attack Complexity Low Low
Privileges Required None None
User Interaction None None
Scope Unchanged Unchanged
Confidentiality Impact None None
Integrity Impact None None
Availability Impact High High
CVSSv3 Version 3.1 3.1
SUSE Bugzilla entry: 1265250 [IN_PROGRESS]

SUSE Security Advisories:

List of released packages

Product(s) Fixed package version(s) References
openSUSE Leap 16.0
  • python313-python-multipart >= 0.0.20-160000.4.1
 Patchnames:
openSUSE-Leap-16.0-827
openSUSE Tumbleweed
  • python311-python-multipart >= 0.0.28-1.1
  • python313-python-multipart >= 0.0.28-1.1
  • python314-python-multipart >= 0.0.28-1.1
 Patchnames:
openSUSE-Tumbleweed-2026-10797

List of packages in QA

Product(s) Package(s)
SUSE Linux Enterprise Server 16.0
  • python313-python-multipart >= 0.0.20-160000.4.1

Status of this issue by product and package

Please note that this evaluation state might be work in progress, incomplete or outdated. Also information for service packs in the LTSS phase is only included for issues meeting the LTSS criteria. If in doubt, feel free to contact us for clarification. The updates are grouped by state of their lifecycle. SUSE product lifecycles are documented on the lifecycle page.

Product(s) Source package State
Products under general support and receiving all security fixes.
SUSE Linux Enterprise Server 16.0 python-python-multipart In progress
SUSE Linux Enterprise Server 16.1 python-python-multipart Affected
SUSE Linux Enterprise Server for SAP applications 16.1 python-python-multipart Affected
Products past their end of life and not receiving proactive updates anymore.
openSUSE Leap 15.6 python-python-multipart Released

SUSE Timeline for this CVE

CVE page created: Thu May 14 00:32:53 2026
CVE page last modified: Sun May 31 16:25:45 2026