vtk-osmesaPyPI
Advisory published Updated
vtk-osmesa is a confirmed malicious PyPI package (MAL-2025-5847) that steals credentials and exfiltrates sensitive data (malicious versions 0.0.7, 9.0.1, 900.548.725…). Do not install it — remove it immediately and rotate any exposed credentials.
Malicious code in vtk-osmesa (PyPI)
What this malware does
During the installation, sensitive information are exfiltrated (incl. env variables)
Category: MALICIOUS - The campaign has clearly malicious intent, like infostealers.
Campaign: 2025-07-vtk-osmesa
Reasons (based on the campaign):
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exfiltration-env-variables
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The package overrides the install command in setup.py to execute malicious code during installation.
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The package contains code to exfiltrate basic data from the system, like IP or username. It has a limited risk.
The OpenSSF Package Analysis project identified 'vtk-osmesa' @ 900.548.735 (pypi) as malicious.
It is considered malicious because:
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The package communicates with a domain associated with malicious activity.
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The package executes one or more commands associated with malicious behavior.
Malicious versions
Indicators of compromise (SHA-256)
Detection & response playbook
Credential / info stealerFind it
Search your lockfiles and build artifacts for vtk-osmesa (16 malicious versions).
If you installed it — respond
vtk-osmesa is built to steal secrets, so assume every credential the build or runtime could read is compromised. Remove it from your project and lockfile, then rotate ALL exposed secrets — npm/registry tokens, cloud keys, CI/CD secrets, SSH keys, and any .env values — from a known-clean machine. Audit logs for unauthorized use of those credentials.
Did it already run?
If vtk-osmesa 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)
- OpenSSF: Package Analysis · finder
Detect & block this
O3 blocks vtk-osmesa-class packages before install and in CI — and if it already ran, its runtime egress monitoring catches the credential exfiltration and severs the channel.