MAL-2026-12143

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/beaver-ui-breadcrumbs/MAL-2026-12143.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-12143
Published
2026-08-05T08:52:53Z
Modified
2026-08-05T10:05:49.364752500Z
Summary
Malicious code in beaver-ui-breadcrumbs (npm)
Details

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

Source: amazon-inspector (d4d5ebbbd036f50f2c29c885260a8b513897fcae3614f714585723f45ad492cd)

On require() of the package, index.js loads compat.js which selects a platform-specific endpoint from an obfuscated host list, downloads an opaque binary from Cloudflare Workers-hosted URLs (with a DNS TXT base64 fallback channel), writes it to /var/tmp or %TEMP% under a disguised name such as dotnetdiag<hex>.exe or.cache<hex>, chmods it 0755, and spawns it detached via /bin/sh -c or cmd /c start /b. Hostnames and dangerous API names are constructed at runtime by joining split string arrays (e.g. reassembling 'oob-worker.cf...workers.dev' and require('child_'+'process'), fs['chmod'+'Sync']) to evade static analysis. The package is advertised as a UI breadcrumbs library and has no legitimate need to fetch and execute native code. A parallel dropper implementation is also shipped in lib/telemetry.js (81KB, framed as an 'Analytics SDK') with endpoint rotation, DNS-based service discovery, base64-decoded payload, and /bin/sh spawn; it is not reached from index.js in this version but is staged in the tarball.

Database specific 
{
    "malicious-packages-origins": [
        {
            "id": "IN-MAL-2026-014454",
            "import_time": "2026-08-05T09:28:12.966917081Z",
            "sha256": "a9d1032ebbf7a1d4822db515b34988c17e9331f1f82360f9912788fcd683acc8",
            "modified_time": "2026-08-05T08:52:53Z",
            "versions": [
                "33.1.6"
            ],
            "source": "amazon-inspector"
        },
        {
            "versions": [
                "0.0.2"
            ],
            "import_time": "2026-08-05T09:28:13.562521471Z",
            "sha256": "d4d5ebbbd036f50f2c29c885260a8b513897fcae3614f714585723f45ad492cd",
            "modified_time": "2026-08-05T08:53:26Z",
            "id": "IN-MAL-2026-014458",
            "source": "amazon-inspector"
        }
    ]
}
References
Credits

Affected packages

npm / beaver-ui-breadcrumbs

Package

Name
beaver-ui-breadcrumbs
View open source insights on deps.dev
Purl
pkg:npm/beaver-ui-breadcrumbs

Affected ranges

Affected versions

0.*
0.0.2
33.*
33.1.6

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 
{
    "package_integrity": [
        {
            "hashes": {
                "sha512_sri": "sha512-Y2EhCivbylN+L70yZxCwhdEYRv6f5vOJV8AWzxkNtBJ4dMdJnxK/J5ex6W7AFFEzpn+dZpy33VyOcV/hGL/aAw==",
                "sha1": "87b5e14fa6d3bd58ff6808c8d16e678fee80fe6f"
            },
            "filename": "beaver-ui-breadcrumbs-33.1.6.tgz"
        }
    ],
    "evidence_files": [
        {
            "path": "_compat.js",
            "sha256": "9df983983dd772dd2582bde4ed2462feecbb1262c303e55e872eca1712159d8b",
            "tlsh": "0da1a79a16a971198bb0dbe487178415f65bf6633380c294fb9ca9885f731248372efc"
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/beaver-ui-breadcrumbs/MAL-2026-12143.json"