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resolvedcritical

Malicious code in yc-as-client (PyPI)

The PyPI package yc-as-client version 11.11.3 was identified as malicious by the OpenSSF Package Analysis project. The malicious code communicates with a domain associated with malicious activity.

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Disclosed
Last updated
Blast radius
Unknown; depends on adoption of yc-as-client 11.11.3
Ecosystems
PyPI
Attack vectors
Compromised package
Affected entities
  • yc-as-client · 11.11.3

The OpenSSF Package Analysis project identified yc-as-client version 11.11.3 on PyPI as containing malicious code. The package was flagged for communicating with a domain associated with malicious activity.

The malicious package was published to PyPI and could have been installed by users of the yc-as-client library. The incident was documented in the OpenSSF malicious-packages repository under identifier MAL-2023-1422.

Users who installed yc-as-client 11.11.3 should immediately remove the package and audit their systems for any suspicious activity or data exfiltration.

Indicators of compromise

Packages
  • yc-as-client==11.11.3

Remediation

  • Immediately uninstall yc-as-client version 11.11.3 from all systems
  • Audit systems for signs of compromise or data exfiltration
  • Review network logs for connections to the malicious domain
  • Use only trusted versions of yc-as-client from PyPI after verification
  • Monitor for any updates or patches from the legitimate package maintainer

Sources

  1. GitHub Advisory GHSA-xh86-cchh-g9v3 · GitHub Advisory Database

Cite this entry

"Malicious code in yc-as-client (PyPI)." supplychainattack.org, Supply Chain Attack Incident Catalog. Disclosed July 21, 2026; last updated July 21, 2026. https://supplychainattack.org/incident/malicious-code-in-yc-as-client-pypi-93tjdw

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