MAL-2026-1990 Malicious code in mcp-transport-proto (PyPI)
- Package
- mcp-transport-proto
- Registry
- PyPI
What is MAL-2026-1990?
MAL-2026-1990 is a malicious package in mcp-transport-proto, published on 20 Mar 2026.
Official description
Installing the package or importing the module exfiltrates basic information about the host, and the package has no other purpose.
Category: PROBABLY_PENTEST - Packages looking like typical pentest packages, but also anything that looks like testing, exploring pre-prepared kits, research & co, with clearly low-harm possibilities.
Campaign: GENERIC-standard-pypi-install-pentest
Reasons (based on the campaign):
The package contains code to exfiltrate basic data from the system, like IP or username. It has a limited risk.
The package overrides the install command in setup.py to execute malicious code during installation.
What should I do about MAL-2026-1990?
Remove the package from your dependencies and lockfiles, then rotate any secrets on machines where it was installed.