MAL-2026-6422

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/leo-config/MAL-2026-6422.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-6422
Published
2026-06-24T23:04:55Z
Modified
2026-06-25T08:01:28.547200152Z
Summary
Malicious code in leo-config (npm)
Details

The leo-config npm package was compromised as part of the Miasma worm campaign targeting the LeoPlatform npm ecosystem. On June 24, 2026, 20 LeoPlatform packages were published within a 3-second window by a threat actor who had taken over the npm account czirker belonging to the LeoPlatform organization.

The malicious payload is triggered automatically during npm install via a binding.gyp file using node-gyp command expansion (<!(node index.js > /dev/null 2>&1 && echo stub.c)), which bypasses lifecycle script scanners. The replaced index.js (~5.2 MB, obfuscated with ROT-N + AES-128-GCM encryption) deploys a multi-stage worm with the following capabilities:

  • Credential theft: Targets npm, GitHub, PyPI, RubyGems, Kubernetes, HashiCorp Vault, AWS (IAM keys, Secrets Manager, IMDS), 1Password, JFrog Artifactory, and SSH keys.
  • AI tool targeting: Exfiltrates configuration files for Claude, Cursor, Gemini, and VS Code.
  • Worm propagation: Enumerates npm packages and auto-publishes version bumps to spread to other maintainers in the ecosystem.
  • GitHub persistence: Creates orphan snapshot-<hex> branches with fake "Dependabot Updates" workflows to maintain access after initial compromise.

Any system that installed this version should be considered fully compromised. Rotate all secrets immediately from a separate, clean machine. See the linked SafeDep report for full payload analysis, indicators of compromise, and remediation guidance.

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

Source: amazon-inspector (97cc6912b16110de3edb6578ad95543fa4f46f38833aa907470ea957d83f50d8)

The package ships a binding.gyp containing GYP command-expansion syntax (<!(...)) at line 6 within the targets/sources fields. npm implicitly runs node-gyp rebuild whenever a binding.gyp is present — even without any declared install/postinstall script — and GYP evaluates <!(...) as a shell command during the configure step. This causes the embedded command to execute automatically on npm install. The package does not appear to ship genuine native source files matching a real native-addon build, so the binding.gyp's only practical purpose is to run the embedded shell command at install time. This is functionally identical to a malicious lifecycle hook and constitutes install-time arbitrary code execution on any machine that installs this package.

Database specific 
{
    "iocs": {
        "urls": [
            "https://safedep.io/miasma-worm-hits-leoplatform-20-npm-packages/"
        ]
    },
    "malicious-packages-origins": [
        {
            "sha256": "97cc6912b16110de3edb6578ad95543fa4f46f38833aa907470ea957d83f50d8",
            "import_time": "2026-06-25T07:47:50.646245576Z",
            "source": "amazon-inspector",
            "modified_time": "2026-06-25T06:30:29Z",
            "versions": [
                "1.1.1"
            ],
            "id": "IN-MAL-2026-007469"
        }
    ]
}
References
Credits

Affected packages

npm / leo-config

Package

Name
leo-config
View open source insights on deps.dev
Purl
pkg:npm/leo-config

Affected ranges

Affected versions

1.*
1.1.1

Database specific

source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/leo-config/MAL-2026-6422.json"
cwes 
[
    {
        "name": "Embedded Malicious Code",
        "description": "The product contains code that appears to be malicious in nature.",
        "cweId": "CWE-506"
    },
    {
        "name": "Embedded Malicious Code",
        "description": "The product contains code that appears to be malicious in nature.",
        "cweId": "CWE-506"
    }
]
indicators 
{
    "evidence_files": [
        {
            "tlsh": "48c08c3ca9380d1029d958285168d402a4b142a3494e2a81fade60284fa840b2898bad",
            "sha256": "32d1bc728d8e504952083a6adc488c309a401c7df4dc8f47b382ce32e4aebe21",
            "path": "binding.gyp"
        }
    ],
    "package_integrity": [
        {
            "filename": "leo-config-1.1.1.tgz",
            "hashes": {
                "sha1": "ed9a17d6567101fa4f9f552a4a52cfcca88fa662",
                "sha512_sri": "sha512-iAXJM+DMPfpLeG219xDI/FtevMLKgOShJodzCD+80piswJJ9onNQRbtkgD7r/DmRXegETk9GeV1Lh7tnm0RSBw=="
            }
        }
    ]
}