Malicious code in yt-yson-bindings (PyPI)
The yt-yson-bindings package on PyPI contained malicious code that exfiltrates basic host information (IP address, username) during installation. The package overrides the install command in setup.py to execute the malicious payload.
- Disclosed
- Last updated
- Blast radius
- All users who installed the malicious yt-yson-bindings package from PyPI
- Ecosystems
- Attack vectors
- Affected entities
- yt-yson-bindingsPyPI package containing malicious code
The yt-yson-bindings package published on PyPI was found to contain malicious code designed to exfiltrate basic system information from infected hosts. The malicious payload is executed during package installation by overriding the install command in setup.py.\n\nThe exfiltrated data includes basic host information such as IP addresses and usernames. According to the OpenSSF malicious packages database, this package was categorized as a typical pentest-style package with limited harm potential, though it still represents a genuine supply chain compromise.\n\nThe malicious code was identified and attributed to the source kam193 (commit 870d6e991bf31676829c84080af299f206568bc11d6f9b42bf5fe2dca50cb79d). The package has been documented in the OpenSSF's malicious packages repository under identifier MAL-2024-12371.
Indicators of compromise
- Packages
- yt-yson-bindings
Remediation
- Remove the yt-yson-bindings package from all systems where it was installed
- Audit system logs for any suspicious activity or data exfiltration following installation of this package
- Review network traffic logs for connections to unknown external hosts that may have occurred during or after package installation
- Consider the host potentially compromised and monitor for further malicious activity
- Do not install or use this package; use legitimate alternatives if the functionality is needed
Sources
- GitHub Advisory GHSA-m94q-8w5h-v8x9 · GitHub Advisory Database
Cite this entry
"Malicious code in yt-yson-bindings (PyPI)." supplychainattack.org, Supply Chain Attack Incident Catalog. Disclosed July 21, 2026; last updated July 21, 2026. https://supplychainattack.org/incident/malicious-code-in-yt-yson-bindings-pypi-zms5dt
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