Kludex python-multipart up to 0.0.25 resource consumption

Summaryinfo

A vulnerability identified as problematic has been detected in Kludex python-multipart up to 0.0.25. Impacted is an unknown function. Performing a manipulation results in resource consumption. This vulnerability was named CVE-2026-40347. The attack may be initiated remotely. There is no available exploit. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in Kludex python-multipart up to 0.0.25. It has been classified as problematic. This affects some unknown functionality. The manipulation with an unknown input leads to a resource consumption vulnerability. CWE is classifying the issue as CWE-400. The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources. This is going to have an impact on availability. The summary by CVE is:

Python-Multipart is a streaming multipart parser for Python. Versions prior to 0.0.26 have a denial of service vulnerability when parsing crafted `multipart/form-data` requests with large preamble or epilogue sections. Upgrade to version 0.0.26 or later, which skips ahead to the next boundary candidate when processing leading CR/LF data and immediately discards epilogue data after the closing boundary.

It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2026-40347 since 04/11/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1499 according to MITRE ATT&CK.

The vulnerability scanner Nessus provides a plugin with the ID 307443 (Linux Distros Unpatched Vulnerability : CVE-2026-40347), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 0.0.26 eliminates this vulnerability. The upgrade is hosted for download at github.com.

The vulnerability is also documented in the databases at Tenable (307443) and CERT Bund (WID-SEC-2026-1407). Be aware that VulDB is the high quality source for vulnerability data.

Affected

• IBM App Connect Enterprise
• Red Hat Enterprise Linux
• Fedora Linux
• IBM QRadar SIEM
• IBM MQ
• IBM Maximo Asset Management
• IBM Sterling Connect:Direct

Productinfo

Type

• Programming Language Software

Vendor

• Kludex

Name

• python-multipart

Version

• 0.0.1
• 0.0.2
• 0.0.3
• 0.0.4
• 0.0.5
• 0.0.6
• 0.0.7
• 0.0.8
• 0.0.9
• 0.0.10
• 0.0.11
• 0.0.12
• 0.0.13
• 0.0.14
• 0.0.15
• 0.0.16
• 0.0.17
• 0.0.18
• 0.0.19
• 0.0.20
• 0.0.21
• 0.0.22
• 0.0.23
• 0.0.24
• 0.0.25

Website

• Product: https://github.com/Kludex/python-multipart/

CPE 2.3info

• 🔒
• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒
• 🔒

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

Be aware that VulDB is the high quality source for vulnerability data.

Discussion