MAL-2026-14529

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/baileys-mbuilder/MAL-2026-14529.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-14529
Aliases
  • GHSA-8m87-xx52-4rjw
Published
2026-08-26T13:28:03Z
Modified
2026-08-27T04:00:13.738808583Z
Summary
Malicious code in baileys-mbuilder (npm)
Details

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

Source: amazon-inspector (508ded2b926100712d9abf255683432d44a917c067f9d69b14b4c678918ce8bb)

package.json declares "postinstall": "node lib/index.js --install", and lib/index.js is a single ~6.3 MB JSFuck-style eval() expression that reconstructs its source character-by-character from boolean/array coercions and %-unescape. The same file is the package's main, and lib/index.mjs re-requires it, so both npm install and any subsequent require/import of the package execute the obfuscated payload. The README documents that the postinstall step downloads MessageBuilder.js from a remote repository and that MB.enableAutoUpdate(ms, cb) periodically re-fetches remote JavaScript, hash-compares it, and on mismatch dynamic-import()s the new module, rebinding the default export via a Proxy so consumers transparently run the newly fetched code. The fetch destination, pinning, and any integrity checks are hidden inside the JSFuck blob and are not visible to static review. The obfuscation scale (6 MB of JSFuck for a message-builder library) has no legitimate purpose and defeats scanner and reviewer inspection of what actually executes on installer machines.

Source: ghsa-malware (396af19b57be005328e2697ade736320c214b8f997f5deca03911df68b4c7e63)

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": "GHSA-8m87-xx52-4rjw",
            "ranges": [
                {
                    "type": "SEMVER",
                    "events": [
                        {
                            "introduced": "0"
                        }
                    ]
                }
            ],
            "modified_time": "2026-08-26T13:28:11Z",
            "import_time": "2026-08-26T13:38:10.45188626Z",
            "source": "ghsa-malware",
            "sha256": "396af19b57be005328e2697ade736320c214b8f997f5deca03911df68b4c7e63"
        },
        {
            "id": "IN-MAL-2026-018792",
            "modified_time": "2026-08-27T03:00:47Z",
            "import_time": "2026-08-27T03:55:28.254933218Z",
            "source": "amazon-inspector",
            "sha256": "508ded2b926100712d9abf255683432d44a917c067f9d69b14b4c678918ce8bb",
            "versions": [
                "4.7.0-lts"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / baileys-mbuilder

Package

Name
baileys-mbuilder
View open source insights on deps.dev
Purl
pkg:npm/baileys-mbuilder

Affected ranges

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

Affected versions

4.*
4.7.0-lts

Database specific

cwes 
[
    {
        "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",
        "cweId": "CWE-506"
    }
]
indicators 
{
    "evidence_files": [
        {
            "path": "lib/index.js",
            "tlsh": "2556caae41137f51f50b95e880665e644b0e0ac7e8d097997b7ce0fa8d9edfed183022",
            "sha256": "59cdece50f9e37c7e88bd64374e4e1be739c97c845516db3dfac5312dd184271"
        },
        {
            "path": "README.md",
            "tlsh": "30d121b12c92f5347a33d36da003a556fe26716e7a06a464344e31f943ce2b10edd93b",
            "sha256": "b6e4c9c0e15f96d60616cadaa614f7935b3e5e542a9c9a45e5b8282d7282bf16"
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/baileys-mbuilder/MAL-2026-14529.json"