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Linux Distros Unpatched Vulnerability : CVE-2026-0858

medium Nessus Plugin ID 288877

Synopsis

The Linux/Unix host has one or more packages installed with a vulnerability that the vendor indicates will not be patched.

Description

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

 - Versions of the package net.sourceforge.plantuml:plantuml before 1.2026.0 are vulnerable to Stored XSS due to insufficient sanitization of interactive attributes in GraphViz diagrams. As a result, a crafted PlantUML diagram can inject malicious JavaScript into generated SVG output, leading to arbitrary script execution in the context of applications that render the SVG. (CVE-2026-0858)

Note that Nessus relies on the presence of the package as reported by the vendor.

Solution

There is no known solution at this time.

See Also

https://security-tracker.debian.org/tracker/CVE-2026-0858

Plugin Details

Severity: Medium

ID: 288877

File Name: unpatched_CVE_2026_0858.nasl

Version: 1.1

Type: local

Agent: unix

Family: Misc.

Published: 1/16/2026

Updated: 1/16/2026

Supported Sensors: Agentless Assessment, Frictionless Assessment Agent, Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Low

Score: 3.0

CVSS v2

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.4

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

CVSS Score Source: CVE-2026-0858

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 9

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

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

CVSS v4

Risk Factor: Medium

Base Score: 5.1

Threat Score: 1.2

Threat Vector: CVSS:4.0/E:U

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:N/SC:L/SI:L/SA:N

Vulnerability Information

CPE: cpe:/o:debian:debian_linux:14.0, cpe:/o:debian:debian_linux:11.0, cpe:/o:debian:debian_linux:13.0, p-cpe:/a:debian:debian_linux:plantuml, cpe:/o:debian:debian_linux:12.0

Required KB Items: Host/local_checks_enabled, global_settings/vendor_unpatched, Host/OS/identifier, Host/cpu

Exploit Ease: No known exploits are available

Vulnerability Publication Date: 1/16/2026

Reference Information

CVE: CVE-2026-0858