Malicious code in zlsrc (PyPI)
Malicious code was discovered in the zlsrc package on PyPI. The package was identified by the OpenSSF malicious-packages project and assigned identifier MAL-2025-6626.
- Disclosed
- Last updated
- Blast radius
- Unknown scope; all users of zlsrc package
- Ecosystems
- Attack vectors
- Affected entities
- zlsrcPyPI package
The zlsrc package on PyPI was found to contain malicious code. The discovery was credited to the OpenSSF's malicious-packages project, which maintains a catalog of known malicious packages in open-source ecosystems.\n\nThe incident was tracked under identifier MAL-2025-6626 and published as GitHub Advisory GHSA-393p-wgrw-6v84 on July 21, 2026. The malicious package posed a critical risk to any users who installed or used the zlsrc package.\n\nNo additional technical details regarding the nature of the malicious payload or affected versions are provided in the source material.
Indicators of compromise
- Packages
- zlsrc
Remediation
- Remove zlsrc from all environments and dependencies
- Audit systems where zlsrc was installed for signs of compromise
- Review package dependencies to ensure no reliance on zlsrc
- Update to a safe alternative if zlsrc functionality is required
Sources
- GitHub Advisory GHSA-393p-wgrw-6v84 · GitHub Advisory Database
Cite this entry
"Malicious code in zlsrc (PyPI)." supplychainattack.org, Supply Chain Attack Incident Catalog. Disclosed July 21, 2026; last updated July 21, 2026. https://supplychainattack.org/incident/malicious-code-in-zlsrc-pypi-tlsxo1
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