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[USN-8343-1] multipart vulnerability

Posted on 28 May 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8343-1
May 28, 2026

multipart vulnerability
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 26.04 LTS
- Ubuntu 25.10

Summary:

multipart could be made to use excessive resources if it received
specially crafted input.

Software Description:
- multipart: library for handling multipart/form-data POST requests

Details:

It was discovered that multipart had an ambiguous regular expression
alternation when handling certain HTTP header values. A remote attacker
could possibly use this issue to cause multipart to use excessive
resources, leading to a denial of service.

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 26.04 LTS
python3-multipart 1.3.0-3ubuntu0.1

Ubuntu 25.10
python3-multipart 1.2.1-2+deb13u1build0.25.10.1

In general, a standard system update will make all the necessary changes.

References:
https://ubuntu.com/security/notices/USN-8343-1
CVE-2026-28356

Package Information:
https://launchpad.net/ubuntu/+source/multipart/1.3.0-3ubuntu0.1
https://launchpad.net/ubuntu/+source/multipart/1.2.1-2+deb13u1build0.25.10.1

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