MAL-2026-3131 Malicious code in kcvlib (PyPI)
Malicious package
Published
MAL-2026-3131 is a malicious package: kcvlib (PyPI). 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-2026-3131/ (Markdown: https://insights.sbomify.com/MAL-2026-3131/index.md)
- Package
- kcvlib
- Registry
- PyPI
What is MAL-2026-3131?
MAL-2026-3131 is a malicious package in kcvlib, published on 28 Apr 2026.
Official description
During import, the package downloads and executes obfuscated code. It appears to be an infostealer framework
Category: MALICIOUS - The campaign has clearly malicious intent, like infostealers.
Campaign: 2026-04-kcvlib
Reasons (based on the campaign):
obfuscation
Downloads and executes a remote malicious script.
infostealer
What should I do about MAL-2026-3131?
Remove the package from your dependencies and lockfiles, then rotate any secrets on machines where it was installed.