MAL-2026-12763

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/devplatform-spa-plugin-cobrowsing/MAL-2026-12763.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-12763
Published
2026-08-05T13:42:59Z
Modified
2026-08-05T14:36:59.543853565Z
Summary
Malicious code in devplatform-spa-plugin-cobrowsing (npm)
Details

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

Source: amazon-inspector (96860be3701b6237d300a1c6e6bc23ff724f14557543451e221b255aff08a29e)

On require() of the package, index.js loads runtime.js which selects a platform-specific endpoint, downloads an opaque binary over HTTPS from obfuscated Cloudflare Workers hosts (hostnames assembled at runtime via array-join, e.g. 'oob-worker.cf<NNN>-<hex>.workers.dev'), with a DNS TXT-record fallback channel under 'c.<domain>' / 'N.<domain>' that returns base64-encoded chunks decoded into the payload. The downloaded bytes are written to /tmp/.cache<rand> (chmod 0755) on Unix or %TEMP%/dotnetdiag<rand>.exe on Windows, and spawned detached via cp.spawn('/bin/sh',['-c',fp+' &'],{detached:true}).unref() or a cmd equivalent. Destinations are unrelated to the package's stated cobrowsing purpose, hostnames are obfuscated to defeat static analysis, and the payload is executed with no integrity check.

Database specific 
{
    "malicious-packages-origins": [
        {
            "sha256": "96860be3701b6237d300a1c6e6bc23ff724f14557543451e221b255aff08a29e",
            "import_time": "2026-08-05T14:19:52.331696634Z",
            "source": "amazon-inspector",
            "versions": [
                "35.4.4"
            ],
            "id": "IN-MAL-2026-015010",
            "modified_time": "2026-08-05T13:42:59Z"
        }
    ]
}
References
Credits

Affected packages

npm / devplatform-spa-plugin-cobrowsing

Package

Name
devplatform-spa-plugin-cobrowsing
View open source insights on deps.dev
Purl
pkg:npm/devplatform-spa-plugin-cobrowsing

Affected ranges

Affected versions

35.*
35.4.4

Database specific

source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/devplatform-spa-plugin-cobrowsing/MAL-2026-12763.json"
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": "sha512-5PL4LOIN70DVs8KRSaAIFKv6kbZ3yMtCGlS/hX5Kd8k8VNXqfn+By6FH4RX7MlFUKyeWF2lHePHlFl8xJBvqPQ==",
                "sha1": "0197b0039208febf10d910c48bdccad1b54c445e"
            },
            "filename": "devplatform-spa-plugin-cobrowsing-35.4.4.tgz"
        }
    ],
    "evidence_files": [
        {
            "path": "_runtime.js",
            "sha256": "eda17797c89d18229275a9413030bea9898ca9ce7b1afce0ad133483c24d0ac2",
            "tlsh": "1fa1b76a156630188b70d7e5c7175416f65bf6637780c298fb9ca5d80fb222883b2efc"
        }
    ]
}