MAL-2026-18093Critical▾ Abyssal⚠ Exploited in the wildMalicious code in workcalender (PyPI)
▾ Abyssal zone — Critical with a public exploit or in-the-wild use
impact 52.3 · likelihood 0 · exploitation 18
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This package contains a stub build-time helper, which in another package of the same uploader was already turned into a backdoor installation. While this package does not yet contain malicious code, it is clear it was uploaded with such intention and likely exploits dependency confusion.
Category: MALICIOUS - The campaign has clearly malicious intent, like infostealers.
Campaign: 2026-10-test-workalendar-internal
Reasons (based on the campaign):
backdoor
The package overrides the install command in setup.py to execute malicious code during installation.
workcalenderRefer to the advisory for the patched release.