MAL-2026-18093

See a problem?
Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/pypi/workcalender/MAL-2026-18093.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-18093
Published
2026-10-20T13:05:17Z
Modified
2026-10-20T13:30:03Z
Summary
Malicious code in workcalender (PyPI)
Details

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

Source: kam193 (9a336c0fa7a5b3ee5f036d678c8c0f0d549135a08d05549ee92cb11b1a7f78fa)

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.

Database specific 
{
    "malicious-packages-origins":  [
        {
            "id":  "pypi/2026-10-test-workalendar-internal/workcalender",
            "import_time":  "2026-10-20T13:19:32.323344399Z",
            "modified_time":  "2026-10-20T13:05:17.498518Z",
            "sha256":  "9a336c0fa7a5b3ee5f036d678c8c0f0d549135a08d05549ee92cb11b1a7f78fa",
            "source":  "kam193",
            "versions":  [
                "17.1.0.dev0"
            ]
        }
    ]
}
References
Credits

Affected packages

PyPI / workcalender

Package

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

Affected ranges

Affected versions

17.*
17.1.0.dev0

Database specific

source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/pypi/workcalender/MAL-2026-18093.json"