{"id":"MAL-2026-18096","title":"Malicious code in workalender (PyPI)","summary":"Malicious code in workalender (PyPI)","severity":"critical","exploited":true,"vendor":"workalender","product":"workalender","ecosystem":"pip","affected":["workalender"],"published":"2026-10-20","updated":"2026-10-20","sourceUpdated":"2026-10-20T14:30:03.703176593Z","source":"OSV","sourceUrl":"https://osv.dev/vulnerability/MAL-2026-18096","references":[{"url":"https://bad-packages.kam193.eu/pypi/package/workalender"}],"tags":["osv","pip","malware"],"ingestedAt":"2026-10-21T11:54:42.740Z","slug":"MAL-2026-18096","body":"## Overview\n\n\n---\n_-= Per source details. Do not edit below this line.=-_\n\n## Source: kam193 (bb4f2824499fd64a22d9dfdb23c454bbb8797422f5281fdd5f454ea64095853a)\nInstalling the package or importing the module exfiltrates basic information about the host, and the package has no other purpose.\n\n\n---\n\nCategory: PROBABLY_PENTEST - Packages looking like typical pentest packages, but also anything that looks like testing, exploring pre-prepared kits, research & co, with clearly low-harm possibilities.\n\n\nCampaign: GENERIC-standard-pypi-install-pentest\n\n\nReasons (based on the campaign):\n\n\n - The package contains code to exfiltrate basic data from the system, like IP or username. It has a limited risk.\n\n\n - The package overrides the install command in setup.py to execute malicious code during installation.\n\n\n## Affected packages\n\n- `workalender`\n\n## Remediation\n\nRefer to the advisory for the patched release.","depth":"abyssal","depthScore":70,"depthScoreParts":{"impact":52.3,"likelihood":0,"exploitation":18,"ransomware":0},"changes":[]}