MAL-2025-41790 Malicious code in tsesyx (PyPI)
Malicious package
Published
MAL-2025-41790 is a malicious package: tsesyx (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-2025-41790/ (Markdown: https://insights.sbomify.com/MAL-2025-41790/index.md)
- Package
- tsesyx
- Registry
- PyPI
What is MAL-2025-41790?
MAL-2025-41790 is a malicious package in tsesyx, published on 2 Aug 2025.
Official description
When imported, the package attempts to exfiltrate environment variables and basic user info
Category: MALICIOUS - The campaign has clearly malicious intent, like infostealers.
Campaign: 2025-07-triple-equals
Reasons (based on the campaign):
exfiltration-env-variables
The package contains code to exfiltrate basic data from the system, like IP or username. It has a limited risk.
What should I do about MAL-2025-41790?
Remove the package from your dependencies and lockfiles, then rotate any secrets on machines where it was installed.