Unity Linux 20.1060e / 20.1070e Security Update: python-tornado (UTSA-2026-005912)

high Nessus Plugin ID 301468

Synopsis

The Unity Linux host is missing one or more security updates.

Description

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-005912 advisory.

Tornado is a Python web framework and asynchronous networking library. In versions 6.5.2 and below, a single maliciously crafted HTTP request can block the server's event loop for an extended period, caused by the HTTPHeaders.add method. The function accumulates values using string concatenation when the same header name is repeated, causing a Denial of Service (DoS). Due to Python string immutability, each concatenation copies the entire string, resulting in O(n) time complexity. The severity can vary from high if max_header_size has been increased from its default, to low if it has its default value of 64KB.
This issue is fixed in version 6.5.3.

Tenable has extracted the preceding description block directly from the Unity Linux 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 python-tornado package.

Plugin Details

Severity: High

ID: 301468

File Name: unity_linux_UTSA-2026-005912.nasl

Version: 1.1

Type: local

Family: Unity Linux Local Security Checks

Published: 3/8/2026

Updated: 3/8/2026

Supported Sensors: 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-2025-67725

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

Required KB Items: Host/local_checks_enabled, Host/cpu, Host/UOS-Server/release, Host/UOS-Server/rpm-list

Exploit Ease: No known exploits are available

Patch Publication Date: 3/6/2026

Vulnerability Publication Date: 12/12/2025

Reference Information

CVE: CVE-2025-67725

Detections

Analytics