MAL-2025-29535 Malicious code in postcss-css-prefixer (npm)
Malicious package
Published
MAL-2025-29535 is a malicious package: postcss-css-prefixer (npm). Every version was published to cause harm.
Task:
1. Search this repository's dependency manifests and lockfiles for the package, including transitive dependencies.
2. If it is present, remove it, regenerate the lockfile with the project's package manager, and replace whatever it was used for.
3. List any CI runners, developer machines or containers that installed it, so their secrets can be rotated.
4. If the package is not used anywhere, say so and change nothing.
Reference: https://insights.sbomify.com/MAL-2025-29535/ (Markdown: https://insights.sbomify.com/MAL-2025-29535/index.md)
- Package
- postcss-css-prefixer
- Registry
- npm
What is MAL-2025-29535?
MAL-2025-29535 is a malicious package in postcss-css-prefixer, published on 14 Aug 2025.
Official description
The package postcss-css-prefixer was found to contain malicious code.
What should I do about MAL-2025-29535?
Remove the package from your dependencies and lockfiles, then rotate any secrets on machines where it was installed.