MAL-2026-6396

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/signup-embedder/MAL-2026-6396.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-6396
Aliases
  • GHSA-8j4q-hx83-pfq9
Published
2026-06-24T14:05:10Z
Modified
2026-06-25T03:31:24.479992563Z
Summary
Malicious code in signup-embedder (npm)
Details

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

Source: amazon-inspector (c48f398f700b78d1893db4570d5d6f16985d937ee79677aab97e673a1cf86e7e)

signup-embedder@99.99.99-poc2 ships preinstall.js and postinstall.js lifecycle scripts that auto-execute on npm install. preinstall.js collects hostname, current working directory, pid, Node version, platform/arch, user, and the list of environment variable names, and POSTs them as JSON to https://webhook.site/f83b073c-a04a-4ac5-8930-507051bd22f7; it also performs a DNS lookup against <timestamp>.callbacks.report for out-of-band confirmation. postinstall.js POSTs a similar host fingerprint (host, cwd, pid, node, platform) to the same webhook.site URL. The package's own description and comments label it a 'HubSpot dependency confusion PoC', and the 99.99.99-poc2 version is the canonical high-version shape used to win resolution against an internal package of the same name. Regardless of the 'PoC' framing, the package is published on the public npm registry and any installer (CI, developer machine, internal build) that resolves the name will have its host identifiers and environment variable names beaconed to an attacker-controlled collector and DNS sink, enabling internal-network mapping and follow-on targeting.

Source: ghsa-malware (8595830013c2298b23fd077af3a2e8ce9722520fdfff68d04ef8135ce11173ca)

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": "c48f398f700b78d1893db4570d5d6f16985d937ee79677aab97e673a1cf86e7e",
            "import_time": "2026-06-24T15:01:17.731382219Z",
            "source": "amazon-inspector",
            "modified_time": "2026-06-24T14:05:10Z",
            "versions": [
                "99.99.99-poc2"
            ],
            "id": "IN-MAL-2026-007435"
        },
        {
            "sha256": "40e099c9ff8cac8636bf152cfd90311c15fc38418e8095f813f06cd97f339b1a",
            "id": "IN-MAL-2026-007450",
            "source": "amazon-inspector",
            "modified_time": "2026-06-25T00:24:57Z",
            "versions": [
                "99.99.99-poc3"
            ],
            "import_time": "2026-06-25T00:57:07.030050542Z"
        },
        {
            "sha256": "8595830013c2298b23fd077af3a2e8ce9722520fdfff68d04ef8135ce11173ca",
            "import_time": "2026-06-25T03:23:52.147345005Z",
            "ranges": [
                {
                    "type": "SEMVER",
                    "events": [
                        {
                            "introduced": "0"
                        }
                    ]
                }
            ],
            "modified_time": "2026-06-25T02:16:09Z",
            "id": "GHSA-8j4q-hx83-pfq9",
            "source": "ghsa-malware"
        }
    ]
}
References
Credits

Affected packages

npm / signup-embedder

Package

Name
signup-embedder
View open source insights on deps.dev
Purl
pkg:npm/signup-embedder

Affected ranges

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

Affected versions

99.*
99.99.99-poc2
99.99.99-poc3

Database specific

source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/signup-embedder/MAL-2026-6396.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"
    },
    {
        "name": "Embedded Malicious Code",
        "description": "The product contains code that appears to be malicious in nature.",
        "cweId": "CWE-506"
    }
]
indicators 
{
    "evidence_files": [
        {
            "tlsh": "462111d5d0e8b75406f2f7d0d1aa121165fbd8159a4269f19011a2a33fa667803638ed",
            "sha256": "41313c196b7d939fa62548a1db6949d3e599decef5c8e3b8e7df831e03c316a2",
            "path": "preinstall.js"
        },
        {
            "tlsh": "a101f1d094e4a7641771f784d1f9122612bfc819eb075df4d01583673f5512c03268ad",
            "sha256": "9fa18174543325644f9a5fb47c15e7fb826a46ff45f70120ce8416cc9c095135",
            "path": "postinstall.js"
        },
        {
            "sha256": "0f5b8ef96004fcad96c7836ebcabd0661dee33e7746d24da01cb444b11fb7421",
            "tlsh": "b1e068304801f7327cc4ebe69913401a21ed4c45c33409b862c30082238e5bd987f012",
            "path": "package.json"
        }
    ],
    "package_integrity": [
        {
            "filename": "signup-embedder-99.99.99-poc2.tgz",
            "hashes": {
                "sha1": "f5d75f93e3481ce8148d3989d38e45a76407a0e9",
                "sha512_sri": "sha512-5KckNEj3mfAYTEkKTpfaQqovpx8dFG9D2zfrY4qsZZ7Njf6ALZjPj5FpBoVfZLA9Jmfqfnk4tQJ4TUt4R7hOxg=="
            }
        }
    ]
}