MAL-2025-5123 Malicious code in pyfernet (PyPI)
Malicious package
Published
MAL-2025-5123 is a malicious package: pyfernet (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-2025-5123/ (Markdown: https://insights.sbomify.com/MAL-2025-5123/index.md)
- Package
- pyfernet
- Registry
- PyPI
What is MAL-2025-5123?
MAL-2025-5123 is a malicious package in pyfernet, published on 27 May 2025.
Official description
If imported, the module starts a multi-stage infostealer, exfiltrating browser data as well as crypto wallets, and also attempts to monitor clipboard looking for crypto wallets addresses
Category: MALICIOUS - The campaign has clearly malicious intent, like infostealers.
Campaign: 2025-05-fernets
Reasons (based on the campaign):
infostealer
clipboard-stealing
exfiltration-generic
obfuscation
exfiltration-browser-data
exfiltration-crypto
typosquatting
What should I do about MAL-2025-5123?
Remove the package from your dependencies and lockfiles, then rotate any secrets on machines where it was installed.