mcp-weather-fullPyPI
Advisory published Updated
mcp-weather-full is a confirmed malicious PyPI package (MAL-2025-191789) that executes malicious code on install (malicious versions 0.8.0, 0.8.1, 0.8.2…). Do not install it — remove it immediately and rotate any exposed credentials.
Malicious code in mcp-weather-full (PyPI)
What this malware does
Package seems to provide an MCP server, but in fact contains attempts to make an LLM agent break safeguards. As the request is about leaves just a flag, it seems to be research.
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: 2025-11-wayspirit
Reasons (based on the campaign):
- llm-threat
Malicious versions
Indicators of compromise (SHA-256)
Detection & response playbook
Malicious packageFind it
Search your lockfiles and build artifacts for mcp-weather-full (19 malicious versions).
If you installed it — respond
Remove mcp-weather-full from your project and lockfile, then assume any secrets accessible to the build or runtime were exposed: rotate API keys, tokens, and credentials, and audit for unexpected outbound activity or persistence.
Did it already run?
If mcp-weather-full was installed, its post-install payload may already have run. Removing the package does not undo that — check outbound connections and credential use from the install window onward.
Frequently asked questions
Campaign
References
Credits
- Kamil Mańkowski (kam193)
Detect & block this
O3 blocks mcp-weather-full-class packages before install and in CI — and if it already ran, its runtime egress monitoring catches the malicious outbound activity and severs the channel.