MAL-2026-2419

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/express-session-js/MAL-2026-2419.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-2419
Published
2026-04-02T09:56:44Z
Modified
2026-04-07T14:53:51.605527Z
Summary
Malicious code in express-session-js (npm)
Details

Package impersonates legitimate express-session package; initPlugin() downloads and executes attacker-controlled remote code on startup via new Function.constructor()

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

Source: amazon-inspector (853f35820c1bfb3bd8be7548debc48dbf86de52a43e91d7b586a9b1ce86a54c7)

The package express-session-js was found to contain malicious code.

Database specific 
{
    "malicious-packages-origins": [
        {
            "ranges": [
                {
                    "type": "SEMVER",
                    "events": [
                        {
                            "introduced": "0"
                        }
                    ]
                }
            ],
            "sha256": "853f35820c1bfb3bd8be7548debc48dbf86de52a43e91d7b586a9b1ce86a54c7",
            "source": "amazon-inspector",
            "modified_time": "2026-04-07T14:24:50Z",
            "import_time": "2026-04-07T14:39:24.981649905Z"
        }
    ]
}
References
Credits

Affected packages

npm / express-session-js

Package

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

Affected ranges

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

Database specific

source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/express-session-js/MAL-2026-2419.json"