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Ubuntu 22.04 LTS / 24.04 LTS / 25.10 / 26.04 LTS : Mistral vulnerability (USN-8422-1)

critical Nessus Plugin ID 320844

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Synopsis

The remote Ubuntu host is missing a security update.

Description

The remote Ubuntu 22.04 LTS / 24.04 LTS / 25.10 / 26.04 LTS host has packages installed that are affected by a vulnerability as referenced in the USN-8422-1 advisory.

 Eduardo Gonzalez Gutierrez and Arnaud Morin discovered that Mistral did not properly enforce access policies on some API endpoints. An attacker could possibly execute arbitrary code on a Mistral worker and possibly extract sensitive data including service credentials from it.

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 packages.

See Also

https://ubuntu.com/security/notices/USN-8422-1

Plugin Details

Severity: Critical

ID: 320844

File Name: ubuntu_USN-8422-1.nasl

Version: 1.1

Type: Local

Agent: unix

Published: 6/12/2026

Updated: 6/12/2026

Supported Sensors: Frictionless Assessment AWS, Frictionless Assessment Azure, Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Continuous Assessment, Nessus

Risk Information

VPR

Risk Factor: High

Score: 7

Percentile: 98.3

CVSS v2

Risk Factor: High

Base Score: 9

Temporal Score: 6.7

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

CVSS Score Source: CVE-2026-41283

CVSS v3

Risk Factor: Critical

Base Score: 9.9

Temporal Score: 8.6

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

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

Vulnerability Information

CPE: p-cpe:/a:canonical:ubuntu_linux:mistral-engine, cpe:/o:canonical:ubuntu_linux:25.10, p-cpe:/a:canonical:ubuntu_linux:mistral-event-engine, cpe:/o:canonical:ubuntu_linux:24.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:python3-mistral, p-cpe:/a:canonical:ubuntu_linux:mistral-api, cpe:/o:canonical:ubuntu_linux:22.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:mistral-common, cpe:/o:canonical:ubuntu_linux:26.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:mistral-executor

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

Exploit Ease: No known exploits are available

Patch Publication Date: 6/11/2026

Vulnerability Publication Date: 6/4/2026

Reference Information

CVE: CVE-2026-41283

USN: 8422-1