MAL-2026-11518

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/exnesss/MAL-2026-11518.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-11518
Published
2026-08-04T09:10:31Z
Modified
2026-08-04T23:05:05.220353369Z
Summary
Malicious code in exnesss (npm)
Details

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

Source: amazon-inspector (184796b4aafee8400786643e9f43338886de2166171c62879cfd4c023655b487)

Package name 'exnesss' typosquats 'exness'. The package.json declares scripts.postinstall: 'node./postinstall.js', and postinstall.js issues an HTTPS GET to a hardcoded Burp Collaborator subdomain (hteimcuxkeb6pacscuexz4d9y04rshg6.oastify.com) on every install. This fires automatically on npm install, contacting an out-of-band interaction host that reveals the installer's network/DNS metadata to the operator of that Collaborator instance. The package provides no advertised functionality to the installer beyond the beacon.

Source: ossf-package-analysis (9547bba265ba397413387555d1bf269b1072ec4aba26409f22c72654c110cbf1)

The OpenSSF Package Analysis project identified 'exnesss' @ 0.0.1 (npm) as malicious.

It is considered malicious because:

  • The package communicates with a domain associated with malicious activity.
Database specific 
{
    "malicious-packages-origins": [
        {
            "import_time": "2026-08-04T09:29:26.285906671Z",
            "sha256": "9547bba265ba397413387555d1bf269b1072ec4aba26409f22c72654c110cbf1",
            "modified_time": "2026-08-04T09:10:31Z",
            "versions": [
                "0.0.1"
            ],
            "source": "ossf-package-analysis"
        },
        {
            "versions": [
                "0.0.1"
            ],
            "import_time": "2026-08-04T22:30:06.924400373Z",
            "sha256": "184796b4aafee8400786643e9f43338886de2166171c62879cfd4c023655b487",
            "modified_time": "2026-08-04T21:53:21Z",
            "id": "IN-MAL-2026-011245",
            "source": "amazon-inspector"
        }
    ]
}
References
Credits

Affected packages

npm / exnesss

Package

Name
exnesss
View open source insights on deps.dev
Purl
pkg:npm/exnesss

Affected ranges

Affected versions

0.*
0.0.1

Database specific

cwes 
[
    {
        "description": "The product contains code that appears to be malicious in nature.",
        "cweId": "CWE-506",
        "name": "Embedded Malicious Code"
    }
]
indicators 
{
    "package_integrity": [
        {
            "hashes": {
                "sha512_sri": "sha512-2u2p2/XLT7Q+HIqJeV4vpb4ixTJlxWam7LguIMcdphapnnC8RQCP66gmuJvaXYQPo3GGclGfRiaKFKgb+VJjlg==",
                "sha1": "f8fede0ac2f9603d5e07fcea8fd7b0c55aa8f922"
            },
            "filename": "exnesss-0.0.1.tgz"
        }
    ],
    "evidence_files": [
        {
            "path": "postinstall.js",
            "sha256": "5588be6b21a3476a1cabfb5fcd7567482ebdb8c8ce3f3e4fa5b003254acbf170",
            "tlsh": "edf024e879f2603816ebe8ece607ec8bb14301173494d590bace10204f876b866f12c0"
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/exnesss/MAL-2026-11518.json"