MAL-2026-10182

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/express-guardian/MAL-2026-10182.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-10182
Published
2026-07-10T22:42:45Z
Modified
2026-07-10T23:01:53.717524481Z
Summary
Malicious code in express-guardian (npm)
Details

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

Source: amazon-inspector (2c911dfdf99f0c6e13cb9e55883a5c2e17cca0b78d3149e38c0cafb6320ea742)

The package advertises itself as Express security middleware (XSS/SQLi protection, input sanitization) but the middleware returned to Express is a no-op that only calls next(). The real behavior is triggered when the exported expressSecurity() is invoked (e.g. via the README-recommended app.use(expressSecurity())): index.js spawns a detached node lib/caller.js child process (stdio ignored, detached=true so it survives the parent). caller.js fetches a hardcoded plain-HTTP endpoint at http://server-genimi-check.vercel.app/defy/v3 and, on a 404 response, passes the response body's token field to new (Function.constructor)("require", res.token) and invokes it with the real require bound — executing attacker-supplied JavaScript in the installer's Node process with full module access. A secondary payload URL is base64-hidden in lib/const.js (DEVAPIKEY decodes to https://jsonkeeper.com/b/4NAKK, a public paste service used as a mutable config/C2 channel). The security-middleware name, README, and no-op middleware shim are cover for the remote code loader; the plain-HTTP transport and paste-hosted secondary channel let the operator swap the executed payload at any time without republishing.

Database specific 
{
    "malicious-packages-origins": [
        {
            "sha256": "2c911dfdf99f0c6e13cb9e55883a5c2e17cca0b78d3149e38c0cafb6320ea742",
            "id": "IN-MAL-2026-009723",
            "import_time": "2026-07-10T22:50:18.600658286Z",
            "modified_time": "2026-07-10T22:42:45Z",
            "versions": [
                "1.4.1"
            ],
            "source": "amazon-inspector"
        },
        {
            "sha256": "a6fbd1787c7c3cefe11d36ee93ac2ff8f29ee74fbd1d9bdd0505e071f43c1142",
            "id": "IN-MAL-2026-009724",
            "modified_time": "2026-07-10T22:42:53Z",
            "versions": [
                "1.4.3"
            ],
            "import_time": "2026-07-10T22:50:18.704665508Z",
            "source": "amazon-inspector"
        }
    ]
}
References
Credits

Affected packages

npm / express-guardian

Package

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

Affected ranges

Affected versions

1.*
1.4.1
1.4.3

Database specific

indicators 
{
    "evidence_files": [
        {
            "sha256": "0939feeda737b0951f6e37d690d65ecfdc5482ae1e1486734aaf59fb2497fcef",
            "tlsh": "af11256528fa7125067594ee8b0b98323522f5233615d4c1b28ccb821fe79ddcab77cd",
            "path": "lib/caller.js"
        },
        {
            "sha256": "d2111c9e5b260a52308693e5d3c8903064204655b68d017749ffa2b8bd7e8902",
            "tlsh": "34213f8175f11198065cd9c8a569e53638e3c4377207b9b0e9ec87862bcf20c4272ad7",
            "path": "index.js"
        },
        {
            "sha256": "d10853dde92fdc48d8cb5505d89e0030fd35e1416a16a820fe5ec4aceef01c4f",
            "tlsh": "b9c08c8351f0684b04301bb3a50ca991f2a1d26f0884160231f564844b396a92848fb7",
            "path": "lib/const.js"
        }
    ],
    "package_integrity": [
        {
            "filename": "express-guardian-1.4.1.tgz",
            "hashes": {
                "sha512_sri": "sha512-stRiKsasGBjQLKXqNO2iv+p44u/OIy4IXEWDKx5lgn4u0kTVbgYVeucecHoWWcos19k6VwNIdBbb4375wPfvuA==",
                "sha1": "615b2b97da6f81928eefc291fdfa040c557c15f3"
            }
        }
    ]
}
cwes 
[
    {
        "cweId": "CWE-506",
        "name": "Embedded Malicious Code",
        "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."
    }
]
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/express-guardian/MAL-2026-10182.json"