MAL-2026-18096

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/pypi/workalender/MAL-2026-18096.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-18096
Published
2026-10-20T13:36:11Z
Modified
2026-10-20T14:30:03Z
Summary
Malicious code in workalender (PyPI)
Details

-= Per source details. Do not edit below this line.=-

Source: kam193 (bb4f2824499fd64a22d9dfdb23c454bbb8797422f5281fdd5f454ea64095853a)

Installing the package or importing the module exfiltrates basic information about the host, and the package has no other purpose.

Category: 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.

Campaign: GENERIC-standard-pypi-install-pentest

Reasons (based on the campaign):

  • The package contains code to exfiltrate basic data from the system, like IP or username. It has a limited risk.

  • The package overrides the install command in setup.py to execute malicious code during installation.

Database specific 
{
    "malicious-packages-origins":  [
        {
            "id":  "pypi/GENERIC-standard-pypi-install-pentest/workalender",
            "import_time":  "2026-10-20T14:18:32.482923489Z",
            "modified_time":  "2026-10-20T13:36:14.492931Z",
            "sha256":  "bb4f2824499fd64a22d9dfdb23c454bbb8797422f5281fdd5f454ea64095853a",
            "source":  "kam193",
            "versions":  [
                "17.1.0.dev0"
            ]
        }
    ]
}
References
Credits

Affected packages

PyPI / workalender

Package

Name
workalender
View open source insights on deps.dev
Purl
pkg:pypi/workalender

Affected ranges

Affected versions

17.*
17.1.0.dev0

Database specific

source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/pypi/workalender/MAL-2026-18096.json"