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Tenable Nessus Agent < 11.0.4 / 11.1.x < 11.1.2 DoS (TNS-2026-05)

medium Nessus Plugin ID 298991

Synopsis

An instance of Nessus Agent installed on the remote system is affected by a vulnerability.

Description

According to its self-reported version, the Tenable Nessus Agent running on the remote host is prior to 11.0.4 or 11.1.x prior to 11.1.2.
It is, therefore, affected by a vulnerability as referenced in the TNS-2026-05 advisory.

 - A vulnerability has been identified where weak file permissions in the Nessus Agent directory could allow unauthorized access, potentially permitting Denial of Service (DoS) attacks. Tenable has released Nessus Agent 11.0.4 and 11.1.2 to address these issues. The installation files can be obtained from the Tenable Downloads Portal (https://www.tenable.com/downloads/nessus). (CVE-2026-2026)

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

Solution

Upgrade to Tenable Nessus Agent 11.0.4, 11.1.2 or later.

See Also

https://docs.tenable.com/release-notes/Content/agent/2026.htm

https://www.tenable.com/security/TNS-2026-05

Plugin Details

Severity: Medium

ID: 298991

File Name: tenable_nessus_agent_TNS-2026-05.nasl

Version: 1.1

Type: local

Agent: windows

Family: Windows

Published: 2/13/2026

Updated: 2/13/2026

Configuration: Enable thorough checks (optional)

Supported Sensors: Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.2

CVSS v2

Risk Factor: Medium

Base Score: 5.2

Temporal Score: 3.8

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

CVSS Score Source: CVE-2026-2026

CVSS v3

Risk Factor: Medium

Base Score: 6.1

Temporal Score: 5.3

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

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

Vulnerability Information

CPE: cpe:/a:tenable:nessus_agent

Required KB Items: installed_sw/Tenable Nessus Agent

Exploit Ease: No known exploits are available

Patch Publication Date: 2/12/2026

Vulnerability Publication Date: 2/12/2026

Reference Information

CVE: CVE-2026-2026