MAL-2026-6188

See a problem?
Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/eslint-helper-1/MAL-2026-6188.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-6188
Aliases
  • GHSA-35c7-535m-jhv6
Published
2026-06-19T03:59:03Z
Modified
2026-06-23T13:32:56.952909530Z
Summary
Malicious code in eslint-helper-1 (npm)
Details

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

Source: amazon-inspector (cfadd6e70cf70ee03d7aae8bfcaa916d29073c5e09ca614bfcb4538c3efc1832)

Package masquerades as an ESLint helper but contains code in index.js that decodes base64 blobs through Buffer.from(..., 'base64').toString() and pipes the resulting strings into execSync('bash...') and execSync('zsh...'). This is the canonical obfuscated-shell-dropper shape: hidden payload bytes are reconstituted at runtime and handed to a shell interpreter, giving the author arbitrary command execution on the installer's machine. The name (eslint-helper-1) and lack of any legitimate ESLint integration are consistent with a typosquat / brand-impersonation lure for a credential-stealing or remote-execution payload.

Source: ghsa-malware (23672dd67920b4f2b3f8b38573128757ad0ee885cd0e9c35a2e0b3c2e4258f0e)

Any computer that has this package installed or running should be considered fully compromised. All secrets and keys stored on that computer should be rotated immediately from a different computer. The package should be removed, but as full control of the computer may have been given to an outside entity, there is no guarantee that removing the package will remove all malicious software resulting from installing it.

Database specific 
{
    "malicious-packages-origins": [
        {
            "sha256": "cfadd6e70cf70ee03d7aae8bfcaa916d29073c5e09ca614bfcb4538c3efc1832",
            "id": "IN-MAL-2026-007043",
            "import_time": "2026-06-19T05:16:48.362267462Z",
            "modified_time": "2026-06-19T03:59:03Z",
            "versions": [
                "5.0.4"
            ],
            "source": "amazon-inspector"
        },
        {
            "sha256": "23672dd67920b4f2b3f8b38573128757ad0ee885cd0e9c35a2e0b3c2e4258f0e",
            "id": "GHSA-35c7-535m-jhv6",
            "import_time": "2026-06-23T13:16:55.898887665Z",
            "modified_time": "2026-06-23T12:15:37Z",
            "ranges": [
                {
                    "events": [
                        {
                            "introduced": "0"
                        }
                    ],
                    "type": "SEMVER"
                }
            ],
            "source": "ghsa-malware"
        }
    ]
}
References
Credits

Affected packages

npm / eslint-helper-1

Package

Name
eslint-helper-1
View open source insights on deps.dev
Purl
pkg:npm/eslint-helper-1

Affected ranges

Type
SEMVER
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

5.*
5.0.4

Database specific

indicators 
{
    "evidence_files": [
        {
            "sha256": "417f814a3838ff76700a5fec27c2a50ff4e8785e96556669448a5d252ac5fed7",
            "tlsh": "4fe166a901162126d6f1e7f8eb560016f7ded2137202c742b6ac4ac92f77528e1d2fec",
            "path": "index.js"
        }
    ],
    "package_integrity": [
        {
            "filename": "eslint-helper-1-5.0.4.tgz",
            "hashes": {
                "sha512_sri": "sha512-zhGVI/O1ntBOjasIyxNGf5651zIrH+hwNlheD1JtDlRf6xfTf66jjpfE5bHGTDyEPdj26NOM4/w3kjc7wsmhcw==",
                "sha1": "3778147696b0f533b0fd61d26d1eefce31f0d212"
            }
        }
    ]
}
cwes 
[
    {
        "cweId": "CWE-506",
        "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."
    }
]
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/eslint-helper-1/MAL-2026-6188.json"