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.

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

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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/

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