MAL-2026-3426 Malicious code in mpkg123 (PyPI)
Malicious package
Published
MAL-2026-3426 is a malicious package: mpkg123 (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-2026-3426/ (Markdown: https://insights.sbomify.com/MAL-2026-3426/index.md)
- Package
- mpkg123
- Registry
- PyPI
What is MAL-2026-3426?
MAL-2026-3426 is a malicious package in mpkg123, published on 11 May 2026.
Official description
If executed as a module, the obfuscated code collects and exfiltrates sensitive data, including passwords saved in a browser.
Category: MALICIOUS - The campaign has clearly malicious intent, like infostealers.
Campaign: 2026-05-old-mpkg123
Reasons (based on the campaign):
infostealer
obfuscation
A Telegram webhook is used to send collected data.
exfiltration-browser-data
What should I do about MAL-2026-3426?
Remove the package from your dependencies and lockfiles, then rotate any secrets on machines where it was installed.