MAL-2026-14345

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/express-session-handler/MAL-2026-14345.json
JSON Data
https://api.test.osv.dev/v1/vulns/MAL-2026-14345
Published
2026-08-21T03:56:39Z
Modified
2026-08-21T05:01:52.373899020Z
Summary
Malicious code in express-session-handler (npm)
Details

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

Source: amazon-inspector (0e94450f5541b39d8310a8b640dee027b0970db6e7cf724352726d49393bfb77)

The package advertises itself as an Express session middleware but on module load unconditionally invokes an initPlugin() routine in index.js that performs an HTTPS fetch to https://api.jsonbin.io/v3/b/6a4f5816f5f4af5e29762c92, parses the response, extracts the record.cerookie field, and passes the resulting string to Function.constructor with require bound as an argument, executing attacker-controlled JavaScript in the installer's Node.js process. The remote document is mutable and controlled by whoever owns that jsonbin bin, so the code executed on any host that requires this module can be changed at any time. The file is prefaced with a '/*! normalize-path (ES6 safe version) */' header and ships an unused normalizePath helper alongside the loader, presenting a cover story unrelated to the actual behavior.

Database specific 
{
    "malicious-packages-origins": [
        {
            "id": "IN-MAL-2026-018494",
            "versions": [
                "2.3.3"
            ],
            "modified_time": "2026-08-21T03:56:39Z",
            "sha256": "0e94450f5541b39d8310a8b640dee027b0970db6e7cf724352726d49393bfb77",
            "import_time": "2026-08-21T04:19:06.268270265Z",
            "source": "amazon-inspector"
        }
    ]
}
References
Credits

Affected packages

npm / express-session-handler

Package

Name
express-session-handler
View open source insights on deps.dev
Purl
pkg:npm/express-session-handler

Affected ranges

Affected versions

2.*
2.3.3

Database specific

indicators 
{
    "evidence_files": [
        {
            "sha256": "d5fb9d5f33e208b9ba37dc361cfc2dbf51a2c64ed0c5a890c95bd2da587a0cca",
            "path": "index.js",
            "tlsh": "4a41e1d924fa6115c1a3e1810e8f8409f22be1133359dac5b98c53546fd07b8a7f2b8a"
        }
    ],
    "package_integrity": [
        {
            "hashes": {
                "sha512_sri": "sha512-WpGlAwr+QSerdM3G4sP7UzGUgGoIKvADToUf4pCQ9wHWngCiK+2bGSQHH7COcp/LlOM1o2+PGatORN92ARXRJQ==",
                "sha1": "d9baf7f930c9aeffa22dc99ccd07feed6d3fe308"
            },
            "filename": "express-session-handler-2.3.3.tgz"
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/express-session-handler/MAL-2026-14345.json"
cwes 
[
    {
        "name": "Embedded Malicious Code",
        "description": "The product contains code that appears to be malicious in nature.",
        "cweId": "CWE-506"
    }
]