MAL-2026-18186

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/net-codec-testmetest/MAL-2026-18186.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-18186
Published
2026-10-22T06:11:48Z
Modified
2026-10-22T06:45:05Z
Summary
Malicious code in net-codec-testmetest (npm)
Details

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

Source: amazon-inspector (7bf1dbafca56ccfcb849f9ebb80b7a1cdf42007fd12618492620e0f7660476b2)

The package has no native source files but ships a binding.gyp whose sole target is type:'none' and whose sources array uses GYP command expansion (<!(env node index.js...)) to execute index.js during node-gyp rebuild, which npm invokes automatically whenever a binding.gyp is present. index.js is a Caesar-cipher-obfuscated IIFE whose decoded body imports node:crypto, reads the shipped data.bin blob, AES-128-GCM-decrypts it with hardcoded key/iv/aad, brotli-decompresses the result into a temporary file, and spawns that file under the Bun runtime (declared as the package's only dependency). The combination — binding.gyp with no native sources used purely as an install-time execution smuggler, an obfuscated eval-based loader, and an opaque encrypted payload executed under an alternate runtime — is a packed dropper with no legitimate function for a stated utility library.

Database specific 
{
    "malicious-packages-origins":  [
        {
            "id":  "IN-MAL-2026-021578",
            "import_time":  "2026-10-22T06:30:24.841350261Z",
            "modified_time":  "2026-10-22T06:11:48Z",
            "sha256":  "7bf1dbafca56ccfcb849f9ebb80b7a1cdf42007fd12618492620e0f7660476b2",
            "source":  "amazon-inspector",
            "versions":  [
                "1.0.1"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / net-codec-testmetest

Package

Name
net-codec-testmetest
View open source insights on deps.dev
Purl
pkg:npm/net-codec-testmetest

Affected ranges

Affected versions

1.*
1.0.1

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":  "binding.gyp",
            "sha256":  "fda4df745212660faa56de9d1f20739402b418aab082401c38a4d3c1304123d3",
            "tlsh":  "e9c08c2cb838094539d91c3491a88402a4b242a3485a2d41fade60286fb841f288cb9d"
        },
        {
            "path":  "index.js",
            "sha256":  "b486d38715fdd26a182a04136e4d632cd53261b4a939445cea4273ade2a60444",
            "tlsh":  "b96264626b891fa561c80cf6b39d6503a5a0e84f39b07b68ffd25597bd3d522bc20370"
        }
    ],
    "package_integrity":  [
        {
            "filename":  "net-codec-testmetest-1.0.1.tgz",
            "hashes":  {
                "sha1":  "189851c3dda4bad3678c4e21eab85f83d44118b0",
                "sha512_sri":  "sha512-jyQhiT5Sdqpjfze+sJsvU6yxESYvFD34AzcGmQixMysYEV6DQc9A5AyAH7uxC83ZeXA3B7m2/cs2YtAcmde2/g=="
            }
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/net-codec-testmetest/MAL-2026-18186.json"