Detections
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Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS : xmltok library vulnerabilities (USN-8023-1)

low Nessus Plugin ID 298808

Synopsis

The remote Ubuntu host is missing one or more security updates.

Description

The remote Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-8023-1 advisory.

 It was discovered that Expat, contained within the xmltok library, incorrectly handled the initialization of parsers for external entities. An attacker could possibly use this issue to cause a denial of service.
 (CVE-2026-24515)

 It was discovered that Expat, contained within the xmltok library, incorrectly handled integer calculations when allocating memory for XML tags. An attacker could possibly use this issue to cause a denial of service or execute arbitrary code. (CVE-2026-25210)

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

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

Solution

Update the affected libxmltok1, libxmltok1-dev and / or libxmltok1t64 packages.

See Also

https://ubuntu.com/security/notices/USN-8023-1

Plugin Details

Severity: Low

ID: 298808

File Name: ubuntu_USN-8023-1.nasl

Version: 1.1

Type: local

Agent: unix

Published: 2/12/2026

Updated: 2/12/2026

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

Risk Information

VPR

Risk Factor: High

Score: 7.0

CVSS v2

Risk Factor: Low

Base Score: 1

Temporal Score: 0.7

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

CVSS Score Source: CVE-2026-24515

CVSS v3

Risk Factor: Low

Base Score: 2.5

Temporal Score: 2.2

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

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

Vulnerability Information

CPE: cpe:/o:canonical:ubuntu_linux:20.04:-:lts, cpe:/o:canonical:ubuntu_linux:24.04:-:lts, cpe:/o:canonical:ubuntu_linux:16.04:-:lts, cpe:/o:canonical:ubuntu_linux:18.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:libxmltok1, p-cpe:/a:canonical:ubuntu_linux:libxmltok1-dev, p-cpe:/a:canonical:ubuntu_linux:libxmltok1t64, cpe:/o:canonical:ubuntu_linux:22.04:-:lts

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

Exploit Ease: No known exploits are available

Patch Publication Date: 2/11/2026

Vulnerability Publication Date: 1/23/2026

Reference Information

CVE: CVE-2026-24515, CVE-2026-25210

USN: 8023-1