MAL-2026-17482

See a problem?
Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/css-logical-prop-shim/MAL-2026-17482.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-17482
Published
2026-10-04T23:14:12Z
Modified
2026-10-04T23:30:06Z
Summary
Malicious code in css-logical-prop-shim (npm)
Details

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

Source: amazon-inspector (d0ffba65f80ee8f200199c8c90ebb6297b8590537c80ea50bb34874d91665b5f)

The package ships thunderboltRegistry.js which imports child_process and invokes execSync with curl commands at multiple sites (lines 30, 39, 47, 48). The declared purpose of the package is a CSS logical-property shim, which has no legitimate need to spawn shells or make outbound curl requests. The co-location of child_process + repeated execSync('curl...') calls in a package whose stated purpose is a frontend CSS polyfill is the shape of a dropper or exfiltration helper rather than library code, and the file name 'thunderboltRegistry' is unrelated to any CSS functionality.

Database specific 
{
    "malicious-packages-origins":  [
        {
            "id":  "IN-MAL-2026-020886",
            "import_time":  "2026-10-04T23:16:30.429895784Z",
            "modified_time":  "2026-10-04T23:14:12Z",
            "sha256":  "d0ffba65f80ee8f200199c8c90ebb6297b8590537c80ea50bb34874d91665b5f",
            "source":  "amazon-inspector",
            "versions":  [
                "1.0.0"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / css-logical-prop-shim

Package

Name
css-logical-prop-shim
View open source insights on deps.dev
Purl
pkg:npm/css-logical-prop-shim

Affected ranges

Affected versions

1.*
1.0.0

Database specific

cwes 
[
    {
        "cweId":  "CWE-506",
        "description":  "The product contains code that appears to be malicious in nature.",
        "name":  "Embedded Malicious Code"
    }
]
indicators 
{
    "evidence_files":  [
        {
            "path":  "thunderboltRegistry.js",
            "sha256":  "38ab2710c4bcd5da44b6d85296d82643b997b2538870780520ec6707a7b57dfe",
            "tlsh":  "a3a176a8b686b1215e9779385b3f600fe1b789832c8ceec0b54949f13f3451956353f5"
        }
    ],
    "package_integrity":  [
        {
            "filename":  "css-logical-prop-shim-1.0.0.tgz",
            "hashes":  {
                "sha1":  "d65ccb03c01d7a0b8012d0b3fec9d35d10cf0e2b",
                "sha512_sri":  "sha512-EV5dTcoIc0LQPqgzF+dw3L56/G1ZK8GEV4Ac1nDEJ1egZjezIf2MdxjN6DJY/S7jweF2LeTQ8emVByxBtze/Ww=="
            }
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/css-logical-prop-shim/MAL-2026-17482.json"