Detections
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Ubuntu 25.10 / 26.04 LTS : multipart vulnerability (USN-8343-1)

high Nessus Plugin ID 318128

Synopsis

The remote Ubuntu host is missing a security update.

Description

The remote Ubuntu 25.10 / 26.04 LTS host has a package installed that is affected by a vulnerability as referenced in the USN-8343-1 advisory.

 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.

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Update the affected python3-multipart package.

See Also

https://ubuntu.com/security/notices/USN-8343-1

Plugin Details

Severity: High

ID: 318128

File Name: ubuntu_USN-8343-1.nasl

Version: 1.1

Type: Local

Agent: unix

Published: 6/1/2026

Updated: 6/1/2026

Supported Sensors: Nessus Agent, Continuous Assessment, Nessus

Risk Information

VPR

Risk Factor: Low

Score: 3.6

CVSS v2

Risk Factor: High

Base Score: 7.8

Temporal Score: 5.8

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C

CVSS Score Source: CVE-2026-28356

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:canonical:ubuntu_linux:25.10, cpe:/o:canonical:ubuntu_linux:26.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:python3-multipart

Required KB Items: Host/cpu, Host/Debian/dpkg-l, Host/Ubuntu, Host/Ubuntu/release

Exploit Ease: No known exploits are available

Patch Publication Date: 5/28/2026

Vulnerability Publication Date: 3/12/2026

Reference Information

CVE: CVE-2026-28356

USN: 8343-1