MAL-2026-13703

See a problem?
Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/chai-as-promised-plus/MAL-2026-13703.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-13703
Published
2026-08-10T12:31:42Z
Modified
2026-08-10T13:04:59.853944668Z
Summary
Malicious code in chai-as-promised-plus (npm)
Details

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

Source: amazon-inspector (be02bee1e19ad24ae6091f0793dc22af62e54030388bbdc7d1aa29b078ac17a5)

The package name mimics the widely-used chai-as-promised assertion helper and reuses its README/description. lib/chai-as-promised-plus.js defines the legitimate plugin factory and then overwrites module.exports with require('./config/config'), so any consumer that imports the package loads lib/config/config.js. That file is a 3,546,568-byte single-line javascript-obfuscator.io bundle (rotated string array of length 20721, two decoder functions, control-flow-flattening dispatcher of the form while(!![]){try{...}catch(o){y.push(y.shift())}}, hex-keyed object literals). A test-assertion helper has no legitimate need to ship a multi-megabyte obfuscated blob that replaces its exports at load time; the concealed payload runs in the consumer's Node.js process on require, which is the standard shape of a typosquat supply-chain attack delivering attacker-controlled code to the installer.

Database specific 
{
    "malicious-packages-origins": [
        {
            "import_time": "2026-08-10T12:51:45.228011785Z",
            "modified_time": "2026-08-10T12:31:42Z",
            "versions": [
                "6.1.3"
            ],
            "source": "amazon-inspector",
            "id": "IN-MAL-2026-017270",
            "sha256": "be02bee1e19ad24ae6091f0793dc22af62e54030388bbdc7d1aa29b078ac17a5"
        }
    ]
}
References
Credits

Affected packages

npm / chai-as-promised-plus

Package

Name
chai-as-promised-plus
View open source insights on deps.dev
Purl
pkg:npm/chai-as-promised-plus

Affected ranges

Affected versions

6.*
6.1.3

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/chai-as-promised-plus/MAL-2026-13703.json"
indicators 
{
    "evidence_files": [
        {
            "path": "lib/chai-as-promised-plus.js",
            "sha256": "d0066243633f49a6a37f582bf948d380a22645c021fa66b35a23203d01d078e4",
            "tlsh": "966212195aa35d230067b37c738f6406e1398a275034ee907afc93596f0692cd6a3bf9"
        },
        {
            "path": "lib/config/config.js",
            "sha256": "1e3f9c43442ed0d25dcaa88833a12cf68ab3865c55031308fe4b5e8ec29c3a92",
            "tlsh": "70f5b8487971e03783dd1767be4a1fece63a186694c8a52b8558bd9f39bc107c1a3ce0"
        }
    ],
    "package_integrity": [
        {
            "hashes": {
                "sha1": "c0e63a51feeb5a4d4f00ba5bb34b1e1046953c2f",
                "sha512_sri": "sha512-fbSoV8jKtWb+QcJdWqJQhlhd1teMNrVlJhd/3iUtxtp428c0nURVR22FRCwje5mOsz9kXVB5RAws3DrI57aENw=="
            },
            "filename": "chai-as-promised-plus-6.1.3.tgz"
        }
    ]
}