MAL-2026-13523

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/beaver-ui-popover-marker/MAL-2026-13523.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-13523
Published
2026-08-07T12:31:20Z
Modified
2026-08-07T13:20:13.449226399Z
Summary
Malicious code in beaver-ui-popover-marker (npm)
Details

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

Source: amazon-inspector (44380c53af51645632593b0a86d93258bb71aecddc88d9ff3487a7906486e559)

On require() of the package, index.js loads vendor.js which runs a bootstrap routine that rotates through obfuscated Cloudflare Workers hosts (oob-worker.cf*.workers.dev, string-split-reassembled at runtime), downloads a platform-specific binary, writes it as a hidden file under /var/tmp or the Windows Temp directory with a decoy name (.cache<hex> / dotnetdiag<hex>.exe), chmods 0755, and spawns it detached via /bin/sh or cmd. A DNS TXT fallback under *.dl.wel1.ru reassembles a base64-encoded payload when HTTPS fetches fail. A cover-story opt-out gate honors DISABLETELEMETRY/ANALYTICSOPTOUT/DONOTTRACK and caches state at /tmp/.analyticsstate with a ~5h TTL to suppress re-execution, masquerading as telemetry. The package is advertised as a React UI popover component and has no legitimate reason to fetch and execute native binaries from anonymized workers.dev endpoints at import time. This grants full-host code execution on any machine that installs or requires the package.

Database specific 
{
    "malicious-packages-origins": [
        {
            "modified_time": "2026-08-07T12:31:20Z",
            "source": "amazon-inspector",
            "sha256": "44380c53af51645632593b0a86d93258bb71aecddc88d9ff3487a7906486e559",
            "import_time": "2026-08-07T12:51:22.205884043Z",
            "id": "IN-MAL-2026-017014",
            "versions": [
                "35.5.8"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / beaver-ui-popover-marker

Package

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

Affected ranges

Affected versions

35.*
35.5.8

Database specific

indicators 
{
    "package_integrity": [
        {
            "filename": "beaver-ui-popover-marker-35.5.8.tgz",
            "hashes": {
                "sha512_sri": "sha512-fczD7A3bhGGtSoZ5ivgWMeOT+4WnzPXPHKLFkoATFnSJ7FXfyNUwrRMT40ula2gKd0VjlYTe0FE8XucSL6vMuA==",
                "sha1": "c77d6419c31c56b3fe6b6c53f58160cb8161108b"
            }
        }
    ],
    "evidence_files": [
        {
            "tlsh": "cea1866a12aa70194bb0d7e48717441af65af6633380c6d8fb6c65941f77124c3b2efc",
            "sha256": "4c543d8d78b49a389306549fef20a46ad7c2f210a285beb25d9f0633cccd9dd8",
            "path": "_vendor.js"
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/beaver-ui-popover-marker/MAL-2026-13523.json"
cwes 
[
    {
        "cweId": "CWE-506",
        "description": "The product contains code that appears to be malicious in nature.",
        "name": "Embedded Malicious Code"
    }
]