MAL-2026-3090

See a problem?
Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/pypi/bytedecs/MAL-2026-3090.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-3090
Published
2026-04-27T05:23:50Z
Modified
2026-04-27T06:19:38.327028Z
Summary
Malicious code in bytedecs (PyPI)
Details

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

Source: kam193 (33034832d7823023eca4d7640030b040b26d4d5274e222bf294b7cf0be28430c)

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": [
        {
            "sha256": "33034832d7823023eca4d7640030b040b26d4d5274e222bf294b7cf0be28430c",
            "id": "pypi/GENERIC-standard-pypi-install-pentest/bytedecs",
            "source": "kam193",
            "modified_time": "2026-04-27T05:23:50.219843Z",
            "import_time": "2026-04-27T06:03:59.042600272Z",
            "versions": [
                "99.9.9"
            ]
        }
    ]
}
References
Credits

Affected packages

PyPI / bytedecs

Package

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

Affected ranges

Affected versions

99.*
99.9.9

Database specific

source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/pypi/bytedecs/MAL-2026-3090.json"