MAL-2026-19041

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/yazxz/MAL-2026-19041.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-19041
Published
2026-10-27T00:00:00Z
Modified
2026-11-09T23:15:38Z
Summary
Malicious code in yazxz (npm)
Details

yazxz is a fork of the Baileys WhatsApp Web library that silently subscribes the installer's own WhatsApp account to WhatsApp Channels chosen by the publisher. When the socket connects, code in lib/Socket/newsletter.js sends the WhatsApp w:mex FOLLOW query for the channel ID(s) 120363403463420361@newsletter, 120363405622645148@newsletter, 120363406290651839@newsletter, 120363422741438435@newsletter, using the victim's authenticated session and without telling them. Same behaviour as the PhantomSub family (MAL-2026-17342).

Database specific 
{
    "iocs": {
        "domains": [],
        "files": [
            {
                "digests": {
                    "sha256": "5f3d24ef85938dcf67da19adb801b62a8b78e687603971c00d61574680d44ee6"
                },
                "paths": [
                    "lib/Socket/newsletter.js"
                ]
            },
            {
                "digests": {
                    "sha256": "a7613d62822168b4d5d734b732d424543112322870f018e1900dc4413c37df22"
                },
                "paths": [
                    "lib/Socket/newsletter.js"
                ]
            }
        ],
        "ips": [],
        "urls": []
    }
}
References
Credits

Affected packages

npm / yazxz

Package

Name
yazxz
View open source insights on deps.dev
Purl
pkg:npm/yazxz

Affected ranges

Affected versions

3.*
3.0.0
5.*
5.0.0

Database specific

cwes 
[
    {
        "cweId": "CWE-506",
        "description": "The product contains code that appears to be malicious in nature.",
        "name": "Embedded Malicious Code"
    }
]
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/yazxz/MAL-2026-19041.json"