Malicious code in yhaplo1 (PyPI)
Malicious package yhaplo1 was published to PyPI as a dependency confusion attack. The package contained code to exfiltrate basic system information but did not perform active exfiltration. The attacker identified themselves as a HackerOne user conducting a bug bounty test.
- Disclosed
- Last updated
- Blast radius
- Low; package was identified as a dependency confusion attempt with limited exfiltration capability and no evidence of widespread adoption.
- Ecosystems
- Attack vectors
- Affected entities
- yhaplo1Malicious package published to PyPI containing code for basic system data exfiltration (IP, username)
A malicious package named yhaplo1 was published to PyPI as part of a dependency confusion attack. The package contained code designed to exfiltrate basic system data such as IP addresses and usernames from infected systems.\n\nThe attacker identified themselves as a HackerOne user and stated the package was created for the purpose of a bug bounty program. According to the OpenSSF malicious packages database, the package did not contain active exfiltration functionality, limiting its actual harm potential.\n\nThe incident was classified as a low-risk pentest-style package under the GENERIC-hackerone-bugbounty campaign. The package has been identified and cataloged by the OpenSSF malicious packages project (MAL-2026-2536).
Indicators of compromise
- Packages
- yhaplo1
Remediation
- Remove yhaplo1 from any Python environments where it may have been installed
- Audit systems that may have installed yhaplo1 for signs of compromise or data exfiltration
- Review PyPI package dependencies to identify and remove any unintended dependency confusion attacks
- Monitor for similar dependency confusion attempts targeting legitimate package names
Sources
- GitHub Advisory GHSA-6q25-qwrp-28hc · GitHub Advisory Database
Cite this entry
"Malicious code in yhaplo1 (PyPI)." supplychainattack.org, Supply Chain Attack Incident Catalog. Disclosed July 21, 2026; last updated July 21, 2026. https://supplychainattack.org/incident/malicious-code-in-yhaplo1-pypi-1pc8tf
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