MAL-2026-4828

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/pypi/hmacsync/MAL-2026-4828.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-4828
Published
2026-05-26T21:05:05Z
Modified
2026-05-26T22:15:55.176072714Z
Summary
Malicious code in hmacsync (PyPI)
Details

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

Source: kam193 (d361ffcded0fc3d88b5095d800b13b3f8a07a581e8003c30bfcf9887eb71243f)

The package is a new version of the previously removed libhmac. The key parts, a malicious payload to inject into hijacked browser extensions, is not included in the package. The code allows hijacking browser extensions to - based on previous package - exfiltrate credentials. This package also contains code to create hidden SSH access to the machine with hardcoded credentials.

Category: MALICIOUS - The campaign has clearly malicious intent, like infostealers.

Campaign: 2026-05-libhmac

Reasons (based on the campaign):

  • crypto-related

  • exfiltration-credentials

  • exfiltration-crypto

  • exfiltration-browser-data

Database specific 
{
    "malicious-packages-origins": [
        {
            "versions": [
                "1.0.0"
            ],
            "modified_time": "2026-05-26T21:05:05.282919Z",
            "sha256": "d361ffcded0fc3d88b5095d800b13b3f8a07a581e8003c30bfcf9887eb71243f",
            "id": "pypi/2026-05-libhmac/hmacsync",
            "source": "kam193",
            "import_time": "2026-05-26T22:04:15.989374562Z"
        }
    ]
}
References
Credits

Affected packages

PyPI / hmacsync

Package

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

Affected ranges

Affected versions

1.*
1.0.0

Database specific

source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/pypi/hmacsync/MAL-2026-4828.json"