MalwarePublished 15 Jun 2026Updated 8 Jul 2026

postcss-minify-selector (npm) · Malicious Code

Affects postcss-minify-selectorSource GCVE Database

Malicious package : remove postcss-minify-selector and rotate any secrets on hosts that installed it.

Data as of 9 Jul 2026, 09:53 UTC

Classification

Malicious package

Published to npm · OSV MAL-2026-5837

What to do

Remove postcss-minify-selector from every project, lockfile and image that pulls it in. Treat any host that installed it as compromised: rotate the credentials, tokens and keys it could read, from a clean machine.

Affected software

Product	Affected	Fixed in
npmpostcss-minify-selector	Affected 0.1.2 – 2.0.2 12 affected builds	Fixed in–

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Description

The npm package 'postcss-minify-selector' is a malicious typosquat designed to mimic the legitimate 'postcss-minify-selectors' plugin. It includes a dependency on another similarly named typosquat package and executes side-effect code upon being required, which can lead to full system compromise. Any system with this package installed or running should be considered fully compromised, and all secrets and keys must be rotated. Removal of the package alone may not eliminate the malicious presence.

Impact

Any computer with this package installed or running is considered fully compromised. Attackers may gain full control, potentially accessing all stored secrets and keys. Immediate rotation of all credentials from a separate, uncompromised system is necessary. Simply removing the package does not guarantee removal of all malicious artifacts or backdoors.

Defensive guidance

The package should be removed immediately from all systems. All secrets and keys stored on affected systems must be rotated from a different, secure computer. Because full compromise is likely, further forensic analysis and remediation may be required to ensure complete removal of malicious code.

Summary

The 'postcss-minify-selector' npm package is a typosquatting malicious package that closely imitates the legitimate 'postcss-minify-selectors' plugin by name and internal identifiers. It declares a dependency on another typosquat package 'postcss-minify-selector-parser', and unconditionally requires a subpath module that executes side-effect code at load time. This behavior is characteristic of a lure-plus-dropper attack, where requiring the package silently executes malicious code. The package is confirmed to fully compromise any computer on which it is installed or run.

References

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What to do

Affected software

Description

AI analysisMachine-generated, updated 9 Jul 2026, 09:53 UTC

Technical details

References

Community reviews