MAL-2026-12721

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/devplatform-npm-versions-checker/MAL-2026-12721.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-12721
Aliases
  • GHSA-pvjr-x84q-9wv8
Published
2026-08-05T13:50:14Z
Modified
2026-08-06T01:20:29.360304336Z
Summary
Malicious code in devplatform-npm-versions-checker (npm)
Details

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

Source: amazon-inspector (626fcec94d9938967e52e37c8973ffd825b75777018f0b58e6785036ff94d122)

On require of the package, adapter.js fetches a platform-specific binary from obfuscated Cloudflare Workers hosts (oob-worker.cf100-416.workers.dev, cf102-baf.workers.dev, cf99-9b3.workers.dev, cf103-070.workers.dev) whose hostnames are hidden via [...].join('') string-splitting, with a DNS-TXT fallback channel that reassembles a base64 payload from numbered TXT records under *.dl.wel1.ru (sdk./ext./pkg./net.dl.wel1.ru). The fetched bytes are written to /tmp/.cache<rand> on Unix or %TEMP%\dotnetdiag<rand>.exe on Windows, chmod 0755'd, and detached-spawned via /bin/sh -c or cmd /c start /b. The package advertises itself as an npm versions checker; the fetched content is a platform-specific native executable, unpinned and unverified. Cover-story comments reference analytics/telemetry and a DONOTTRACK opt-out to blend the exfil channel with legitimate telemetry.

Source: ghsa-malware (d4308f994c4cb27b6832304abd9cca9c913531653deb39e484f3d972339927e4)

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": [
        {
            "import_time": "2026-08-05T14:19:57.626393938Z",
            "sha256": "626fcec94d9938967e52e37c8973ffd825b75777018f0b58e6785036ff94d122",
            "modified_time": "2026-08-05T13:50:14Z",
            "id": "IN-MAL-2026-015059",
            "versions": [
                "35.5.9"
            ],
            "source": "amazon-inspector"
        },
        {
            "import_time": "2026-08-06T00:58:53.429498213Z",
            "modified_time": "2026-08-05T18:37:13Z",
            "ranges": [
                {
                    "type": "SEMVER",
                    "events": [
                        {
                            "introduced": "0"
                        }
                    ]
                }
            ],
            "id": "GHSA-pvjr-x84q-9wv8",
            "sha256": "d4308f994c4cb27b6832304abd9cca9c913531653deb39e484f3d972339927e4",
            "source": "ghsa-malware"
        }
    ]
}
References
Credits

Affected packages

npm / devplatform-npm-versions-checker

Package

Name
devplatform-npm-versions-checker
View open source insights on deps.dev
Purl
pkg:npm/devplatform-npm-versions-checker

Affected ranges

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

Affected versions

35.*
35.5.9

Database specific

cwes 
[
    {
        "name": "Embedded Malicious Code",
        "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."
    }
]
indicators 
{
    "package_integrity": [
        {
            "hashes": {
                "sha512_sri": "sha512-sS3n3NmIiasUgvu25r8Gaox6gPRF+qF/X97AiHzqIP2hNqRiQCFjpc/FksBnmvk/ebRb4ezBCFFU22BW3wUaaw==",
                "sha1": "3a959b360b0d0a50de8f4f720156d05fa72c68d5"
            },
            "filename": "devplatform-npm-versions-checker-35.5.9.tgz"
        }
    ],
    "evidence_files": [
        {
            "path": "_adapter.js",
            "sha256": "821261b9c2bb0d7ea7cea5a0a94dcfd6f083fdb97a2a66b0a36801b1d666e5cf",
            "tlsh": "37b1956616a670184bb0ebe4c6075415f65bf2633780d598fb9c69981ff312483b2efc"
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/devplatform-npm-versions-checker/MAL-2026-12721.json"