MAL-2026-19224

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/helper-agent/MAL-2026-19224.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-19224
Published
2026-11-13T03:55:49Z
Modified
2026-11-13T04:30:04Z
Summary
Malicious code in helper-agent (npm)
Details

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

Source: amazon-inspector (4ab651b6042b8ef6c2c986a58d276931d9353d723fd914c9b7c728cac5cf0fc9)

The package declares a postinstall script node probe.cjs that fires on every npm install. On execution it POSTs install-start and status markers to a hardcoded webhook.site dead-drop (https://webhook.site/a4bf0f9f-6d96-46e6-80ac-b76a5329f481), then scans several localhost ports (1337, 80, 3000, 8080, 5000) for a specific JSON API and, when a matching record (id ECT-987654) is found, issues a PUT that overwrites that service's manifest with an author-chosen status string. Both the outbound beacon destination and the local mutation target are hardcoded and not user-configurable. The package.json self-describes as an "Authorized HTB dependency-resolution canary" and the mutation path is gated to a narrow challenge record, but the install-time outbound beacon and localhost scanning fire unconditionally for any installer, confirming installer execution to a third-party collector and granting the author write access to a matching local service on the installer's host.

Database specific 
{
    "malicious-packages-origins": [
        {
            "id": "IN-MAL-2026-022767",
            "import_time": "2026-11-13T04:13:31.350640292Z",
            "modified_time": "2026-11-13T03:55:58Z",
            "sha256": "4ab651b6042b8ef6c2c986a58d276931d9353d723fd914c9b7c728cac5cf0fc9",
            "source": "amazon-inspector",
            "versions": [
                "1.0.4"
            ]
        },
        {
            "id": "IN-MAL-2026-022766",
            "import_time": "2026-11-13T04:13:31.247913509Z",
            "modified_time": "2026-11-13T03:55:49Z",
            "sha256": "f01dff7c435620ecbed6343306f78e4402baebad429485c0946687951bd98ea3",
            "source": "amazon-inspector",
            "versions": [
                "1.0.1"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / helper-agent

Package

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

Affected ranges

Affected versions

1.*
1.0.1
1.0.4

Database specific

cwes 
[
    {
        "cweId": "CWE-506",
        "description": "The product contains code that appears to be malicious in nature.",
        "name": "Embedded Malicious Code"
    },
    {
        "cweId": "CWE-506",
        "description": "The product contains code that appears to be malicious in nature.",
        "name": "Embedded Malicious Code"
    }
]
indicators 
{
    "evidence_files": [
        {
            "path": "probe.cjs",
            "sha256": "5637bf88c6a410be78fba1205a14b7f4cd4e0101a44d2d1a87f8fd8f762f58c7",
            "tlsh": "5851559c14fb101902efe575ebbb7026b3769503208d8f007b9e43552f892a99da56ce"
        }
    ],
    "package_integrity": [
        {
            "filename": "helper-agent-1.0.4.tgz",
            "hashes": {
                "sha1": "f2fada4070081fc6d794f6c39bb7b947f2f7f569",
                "sha512_sri": "sha512-uuI4u/4f2bneAvPAncFrludreIugY3J6B8rq0FspoyhuQ3IhHcK/4iIp96QkxmJWeln/OW3cNkY6FeM11ujTTQ=="
            }
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/helper-agent/MAL-2026-19224.json"