nspackPyPI
Advisory published Updated
nspack is a confirmed malicious PyPI package (MAL-2026-2115) that steals credentials and exfiltrates sensitive data (malicious versions 0.1.0, 0.1.2, 0.1.3…). Do not install it — remove it immediately and rotate any exposed credentials.
Malicious code in nspack (PyPI)
What this malware does
These packages are used as build dependencies of malicious packages in newer waves of the campaign 2026-02-urllib-slim. They are used to split the malicious action between dependencies and are not malicious alone, but are used together to: exfiltrate information through DNS, collect information about the processes and covering tracks by installing packages from local private repositories.
Package nspack additionally notifies upon importing a domain known for malicious activity with the package and hostname.
Category: MALICIOUS - The campaign has clearly malicious intent, like infostealers.
Campaign: 2026-03-geekennedy
Reasons (based on the campaign):
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The package contains code to exfiltrate basic data from the system, like IP or username. It has a limited risk.
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The malicious code is intentionally included in a dependency of the package
Malicious versions
Indicators of compromise (SHA-256)
Detection & response playbook
Credential / info stealerFind it
Search your lockfiles and build artifacts for nspack (8 malicious versions).
If you installed it — respond
nspack 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 nspack 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) · reporter
Detect & block this
O3 blocks nspack-class packages before install and in CI — and if it already ran, its runtime egress monitoring catches the credential exfiltration and severs the channel.