MAL-2026-864

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/pypi/marshmellow/MAL-2026-864.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-864
Published
2026-02-12T07:10:57Z
Modified
2026-02-19T22:58:23Z
Summary
Malicious code in marshmellow (PyPI)
Details

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

Source: kam193 (dbf6f50353e6489a831a2575831b93fd5f99a9cbd60cc30260fd13838beda73f)

Package is a typosquatting or dependency confusion attempt with a low-harm local-only action, like leaving a flag file.

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-local-typosquatting

Reasons (based on the campaign):

  • dependency-confusion

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

  • typosquatting

Source: ossf-package-analysis (385a79bb53771282b64601f5a3b17f0d7a3d735efbf863584f0dd2755bc2bf08)

The OpenSSF Package Analysis project identified 'marshmellow' @ 1.1.0 (pypi) as malicious.

It is considered malicious because:

  • The package executes one or more commands associated with malicious behavior.
Database specific 
{
    "malicious-packages-origins": [
        {
            "id": "pypi/GENERIC-local-typosquatting/marshmellow",
            "import_time": "2026-02-12T09:22:04.906442978Z",
            "modified_time": "2026-02-12T08:43:45.578698Z",
            "sha256": "dbf6f50353e6489a831a2575831b93fd5f99a9cbd60cc30260fd13838beda73f",
            "source": "kam193",
            "versions": [
                "1.0.0",
                "1.1.0"
            ]
        },
        {
            "import_time": "2026-02-19T22:45:34.187993225Z",
            "modified_time": "2026-02-12T07:27:12Z",
            "sha256": "385a79bb53771282b64601f5a3b17f0d7a3d735efbf863584f0dd2755bc2bf08",
            "source": "ossf-package-analysis",
            "versions": [
                "1.1.0"
            ]
        },
        {
            "import_time": "2026-02-19T22:45:34.068136728Z",
            "modified_time": "2026-02-12T07:10:57Z",
            "sha256": "f4aaf04cc47fc8c3690dc509c889e05ca1a17673a00bf32579c76b629c6b58c5",
            "source": "ossf-package-analysis",
            "versions": [
                "1.0.0"
            ]
        }
    ]
}
References
Credits

Affected packages

PyPI / marshmellow

Package

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

Affected ranges

Affected versions

1.*
1.0.0
1.1.0

Database specific

source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/pypi/marshmellow/MAL-2026-864.json"