Linux Distros Unpatched Vulnerability : CVE-2026-45623

critical Nessus Plugin ID 330382

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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.

- PostCSS takes a CSS file and provides an API to analyze and modify its rules by transforming the rules into an Abstract Syntax Tree. In versions 8.5.11 and prior, the PreviousMap parses the /*# sourceMappingURL=PATH */ comment from any CSS string passed to process() and dereferences PATH against the local filesystem with no scheme, allowlist, or traversal check. An attacker who controls the CSS input can cause the host process to read any file readable by Node and leak the first ~10 bytes of its content through the resulting JSON.parse SyntaxError message. The bug also yields a precise file-existence oracle and a controllable-read primitive that may be combined with large-file targets for DoS. The behaviour is triggered with PostCSS's default options no from, no map, no plugins required and is therefore reachable from any pipeline that runs untrusted CSS through PostCSS (CMS themes, user-uploaded styles, browser-extension/userstyle processors, build pipelines for third-party packages, blog comment renderers, etc.). This issue has been fixed in version 8.5.12. (CVE-2026-45623)

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

Solution

There is no known solution at this time.

Plugin Details

Severity: Critical

ID: 330382

File Name: unpatched_CVE_2026_45623.nasl

Version: 1.5

Type: Local

Agent: unix

Family: Misc.

Published: 7/28/2026

Updated: 8/12/2026

Supported Sensors: Frictionless Assessment AWS, Frictionless Assessment Azure, Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Tenable Cloud Security, Tenable Self-Hosted Container Security, Nessus

Risk Information

VPR

Risk Factor: High

Score: 7

Percentile: 98.22

CVSS v2

Risk Factor: High

Base Score: 9.4

Temporal Score: 8.5

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

CVSS Score Source: CVE-2026-45623

CVSS v3

Risk Factor: Critical

Base Score: 9.1

Temporal Score: 8.6

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

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

Vulnerability Information

CPE: cpe:/o:canonical:ubuntu_linux:20.04:-:lts, cpe:/o:canonical:ubuntu_linux:22.04:-:lts, cpe:/o:canonical:ubuntu_linux:24.04:-:lts, cpe:/o:canonical:ubuntu_linux:26.04:-:lts, cpe:/o:centos:centos:7, cpe:/o:centos:centos:8, cpe:/o:debian:debian_linux:11.0, cpe:/o:debian:debian_linux:12.0, cpe:/o:debian:debian_linux:13.0, cpe:/o:redhat:enterprise_linux:10, cpe:/o:redhat:enterprise_linux:7, cpe:/o:redhat:enterprise_linux:8, cpe:/o:redhat:enterprise_linux:9, p-cpe:/a:canonical:ubuntu_linux:node-postcss, p-cpe:/a:centos:centos:firefox-x11, p-cpe:/a:centos:centos:firefox, p-cpe:/a:centos:centos:goose, p-cpe:/a:centos:centos:grafana-azure-monitor, p-cpe:/a:centos:centos:grafana-cloudwatch, p-cpe:/a:centos:centos:grafana-elasticsearch, p-cpe:/a:centos:centos:grafana-graphite, p-cpe:/a:centos:centos:grafana-influxdb, p-cpe:/a:centos:centos:grafana-loki, p-cpe:/a:centos:centos:grafana-mssql, p-cpe:/a:centos:centos:grafana-mysql, p-cpe:/a:centos:centos:grafana-opentsdb, p-cpe:/a:centos:centos:grafana-postgres, p-cpe:/a:centos:centos:grafana-prometheus, p-cpe:/a:centos:centos:grafana-selinux, p-cpe:/a:centos:centos:grafana-stackdriver, p-cpe:/a:centos:centos:grafana, p-cpe:/a:centos:centos:python-syspurpose, p-cpe:/a:centos:centos:rhsm-gtk, p-cpe:/a:centos:centos:subscription-manager-cockpit, p-cpe:/a:centos:centos:subscription-manager-gui, p-cpe:/a:centos:centos:subscription-manager-initial-setup-addon, p-cpe:/a:centos:centos:subscription-manager-migration, p-cpe:/a:centos:centos:subscription-manager-plugin-container, p-cpe:/a:centos:centos:subscription-manager-plugin-ostree, p-cpe:/a:centos:centos:subscription-manager-rhsm-certificates, p-cpe:/a:centos:centos:subscription-manager-rhsm, p-cpe:/a:centos:centos:subscription-manager, p-cpe:/a:centos:centos:thunderbird, p-cpe:/a:debian:debian_linux:node-postcss, p-cpe:/a:redhat:enterprise_linux:firefox-x11, p-cpe:/a:redhat:enterprise_linux:firefox, p-cpe:/a:redhat:enterprise_linux:goose, p-cpe:/a:redhat:enterprise_linux:grafana-azure-monitor, p-cpe:/a:redhat:enterprise_linux:grafana-cloudwatch, p-cpe:/a:redhat:enterprise_linux:grafana-elasticsearch, p-cpe:/a:redhat:enterprise_linux:grafana-graphite, p-cpe:/a:redhat:enterprise_linux:grafana-influxdb, p-cpe:/a:redhat:enterprise_linux:grafana-loki, p-cpe:/a:redhat:enterprise_linux:grafana-mssql, p-cpe:/a:redhat:enterprise_linux:grafana-mysql, p-cpe:/a:redhat:enterprise_linux:grafana-opentsdb, p-cpe:/a:redhat:enterprise_linux:grafana-postgres, p-cpe:/a:redhat:enterprise_linux:grafana-prometheus, p-cpe:/a:redhat:enterprise_linux:grafana-selinux, p-cpe:/a:redhat:enterprise_linux:grafana-stackdriver, p-cpe:/a:redhat:enterprise_linux:grafana, p-cpe:/a:redhat:enterprise_linux:python-syspurpose, p-cpe:/a:redhat:enterprise_linux:rhsm-gtk, p-cpe:/a:redhat:enterprise_linux:subscription-manager-cockpit, p-cpe:/a:redhat:enterprise_linux:subscription-manager-gui, p-cpe:/a:redhat:enterprise_linux:subscription-manager-initial-setup-addon, p-cpe:/a:redhat:enterprise_linux:subscription-manager-migration, p-cpe:/a:redhat:enterprise_linux:subscription-manager-plugin-container, p-cpe:/a:redhat:enterprise_linux:subscription-manager-plugin-ostree, p-cpe:/a:redhat:enterprise_linux:subscription-manager-rhsm-certificates, p-cpe:/a:redhat:enterprise_linux:subscription-manager-rhsm, p-cpe:/a:redhat:enterprise_linux:subscription-manager, p-cpe:/a:redhat:enterprise_linux:thunderbird

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

Exploit Available: true

Exploit Ease: Exploits are available

Vulnerability Publication Date: 7/23/2026

Reference Information

CVE: CVE-2026-45623

Detections

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