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
Aliases
  • GHSA-49hq-jqjw-mhr7
Published
2026-08-05T13:42:59Z
Modified
2026-08-24T15:30:28Z
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-.workers.dev'), with a DNS TXT-record fallback channel under 'c.' / 'N.' that returns base64-encoded chunks decoded into the payload. The downloaded bytes are written to /tmp/.cache (chmod 0755) on Unix or %TEMP%/dotnet_diag_.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.

Source: ghsa-malware (aa1e66a1340ad906053aaac4b55743c6d3e7efd724f6db8b8b81b7921962eb02)

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": [
        {
            "id": "IN-MAL-2026-015010",
            "import_time": "2026-08-05T14:19:52.331696634Z",
            "modified_time": "2026-08-05T13:42:59Z",
            "sha256": "96860be3701b6237d300a1c6e6bc23ff724f14557543451e221b255aff08a29e",
            "source": "amazon-inspector",
            "versions": [
                "35.4.4"
            ]
        },
        {
            "id": "GHSA-49hq-jqjw-mhr7",
            "import_time": "2026-08-24T15:27:39.250167605Z",
            "modified_time": "2026-08-24T15:05:33Z",
            "ranges": [
                {
                    "events": [
                        {
                            "introduced": "0"
                        }
                    ],
                    "type": "SEMVER"
                }
            ],
            "sha256": "aa1e66a1340ad906053aaac4b55743c6d3e7efd724f6db8b8b81b7921962eb02",
            "source": "ghsa-malware"
        }
    ]
}
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

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

Affected versions

35.*
35.4.4

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": "_runtime.js",
            "sha256": "eda17797c89d18229275a9413030bea9898ca9ce7b1afce0ad133483c24d0ac2",
            "tlsh": "1fa1b76a156630188b70d7e5c7175416f65bf6637780c298fb9ca5d80fb222883b2efc"
        }
    ],
    "package_integrity": [
        {
            "filename": "devplatform-spa-plugin-cobrowsing-35.4.4.tgz",
            "hashes": {
                "sha1": "0197b0039208febf10d910c48bdccad1b54c445e",
                "sha512_sri": "sha512-5PL4LOIN70DVs8KRSaAIFKv6kbZ3yMtCGlS/hX5Kd8k8VNXqfn+By6FH4RX7MlFUKyeWF2lHePHlFl8xJBvqPQ=="
            }
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/devplatform-spa-plugin-cobrowsing/MAL-2026-12763.json"