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SCA: security update for postcss (GHSA-6g55-p6wh-862q)

critical Tenable Self-Hosted Container Security Plugin ID 445210

Description

There are packages installed that are affected by a vulnerability referenced in the following CVE:

 - 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)

Solution

Update the postcss library and its related packages to version 8.5.12 or later.

See Also

https://github.com/advisories/GHSA-6g55-p6wh-862q

Plugin Details

Severity: Critical

ID: 445210

Version: Revision 1.4

Type: Local

Family: SCA Checks

Published: 7/23/2026

Updated: 8/7/2026

Supported Sensors: Tenable Cloud Security, Tenable Self-Hosted Container Security

Risk Information

VPR

Risk Factor: High

Score: 7

Percentile: 98.22

Vendor

Vendor Severity: High

CVSS v2

Risk Factor: High

Base Score: 9.4

Temporal Score: 7.4

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: 8.2

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:O/RC:C

Vulnerability Information

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 7/23/2026

Vulnerability Publication Date: 7/23/2026

Reference Information

CVE: CVE-2026-45623