MAL-2026-11543

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/simple-date-formatter-new-5/MAL-2026-11543.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-11543
Published
2026-08-04T22:05:23Z
Modified
2026-08-04T23:05:29.552346160Z
Summary
Malicious code in simple-date-formatter-new-5 (npm)
Details

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

Source: amazon-inspector (204253c08cc90b592f9c086ada633879141aee2bdf27e7286007c709f3b866ab)

Package advertised as a date-formatting utility performs supply-chain attack behavior. package.json declares a postinstall shell one-liner that, on npm install, collects kernel version, IP addresses, Kubernetes API probes, cloud instance metadata (AWS 169.254.169.254 and Alibaba 100.100.100.200), an internal /24 TCP scan, ARP/DNS data, and a listing of /var/run/secrets/kubernetes.io/serviceaccount/, then POSTs the aggregated output via curl to http://safjhdvsfwzhieemkdzbgr54r0yjhrmok.oast.fun/escinfo9. The main module (index.js) additionally enumerates ~/.ssh for key files on require() and issues an HTTPS POST containing the directory listing plus username and platform to hardcoded IP 124.221.154.135:443/post. The advertised formatDate export is a trivial cover for the exfiltration code paths.

Database specific 
{
    "malicious-packages-origins": [
        {
            "source": "amazon-inspector",
            "modified_time": "2026-08-04T22:05:23Z",
            "sha256": "204253c08cc90b592f9c086ada633879141aee2bdf27e7286007c709f3b866ab",
            "id": "IN-MAL-2026-011326",
            "versions": [
                "1.0.0"
            ],
            "import_time": "2026-08-04T22:30:11.06936734Z"
        }
    ]
}
References
Credits

Affected packages

npm / simple-date-formatter-new-5

Package

Name
simple-date-formatter-new-5
View open source insights on deps.dev
Purl
pkg:npm/simple-date-formatter-new-5

Affected ranges

Affected versions

1.*
1.0.0

Database specific

cwes 
[
    {
        "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-IbE1yMMMGyXoalQPvl8rWhltIx7mHHM7E8rt1IUZRbQ1TBG6nnhJwfsj17cs3LrLzW/3IHBjP+cM7TG3/EyzfA==",
                "sha1": "90cb2d0e3ea44253400435aca5ad26d7796a7d94"
            },
            "filename": "simple-date-formatter-new-5-1.0.0.tgz"
        }
    ],
    "evidence_files": [
        {
            "path": "package.json",
            "sha256": "965ce6eabe579444ceffd11e37f9dbb1276312d03ee79ad4b018f053f1dd129b",
            "tlsh": "e9210c98f060ac33af8dda19de23168bb647948f1eb53d1cc5c38c2c864cbe1157c665"
        },
        {
            "path": "index.js",
            "sha256": "1d5404dbbd7f6a35142bc11e276bcff7b334f927a198399e6b0d9aa09ecfd098",
            "tlsh": "8cc08c94a716b2866326122096a74100be5cc2300b9a6a62b88ec0c00144c12805ef8c"
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/simple-date-formatter-new-5/MAL-2026-11543.json"