MAL-2026-11033

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/eth-codergen/MAL-2026-11033.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-11033
Aliases
  • GHSA-87w3-vjw9-8h4w
Published
2026-07-23T18:28:20Z
Modified
2026-08-04T23:05:04.753456139Z
Summary
Malicious code in eth-codergen (npm)
Details

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

Source: amazon-inspector (dda2a0fbfa98304482ef90da4f137c863775959e107fccd495311fcba4fd185c)

The package is advertised as an Ethereum ABI code generator but its index.js is a verbatim copy of the unrelated mongoose-lean-hooks plugin. Appended to the same line as module.exports = leanhooksPlugin; (padded with whitespace to push it off-screen) is a top-level Function("tQ4eR5v",...) call whose body is a custom hex/XOR-mixer decoder (constants 0x9e3779b9, 0x243f6a88, 0x6a09e667) that reconstructs an opaque payload from an encoded byte array and executes it. The obfuscated loader runs automatically whenever a consumer calls require('eth-codergen'), giving the publisher arbitrary code execution in the consumer's Node.js process. The package name differs by one letter from the legitimate eth-codegen package, and the README even instructs npm install --save-dev eth-codegen, indicating the package is positioned to catch developers who mistype the real package name. No Ethereum/ABI codegen functionality is present in the shipped code.

Source: ghsa-malware (69eee48bc43bf04d3a35021657809e8e2615ae84250ee1e7b229175969807a25)

Any computer that has this package installed or running should be considered fully compromised. All secrets and keys stored on that computer should be rotated immediately from a different computer. The package should be removed, but as full control of the computer may have been given to an outside entity, there is no guarantee that removing the package will remove all malicious software resulting from installing it.

Database specific 
{
    "malicious-packages-origins": [
        {
            "id": "GHSA-87w3-vjw9-8h4w",
            "modified_time": "2026-07-23T18:28:21Z",
            "ranges": [
                {
                    "events": [
                        {
                            "introduced": "0"
                        }
                    ],
                    "type": "SEMVER"
                }
            ],
            "sha256": "69eee48bc43bf04d3a35021657809e8e2615ae84250ee1e7b229175969807a25",
            "import_time": "2026-07-23T22:48:43.760148363Z",
            "source": "ghsa-malware"
        },
        {
            "id": "IN-MAL-2026-011156",
            "modified_time": "2026-08-04T21:40:34Z",
            "versions": [
                "1.0.2"
            ],
            "source": "amazon-inspector",
            "import_time": "2026-08-04T22:30:02.276038516Z",
            "sha256": "dda2a0fbfa98304482ef90da4f137c863775959e107fccd495311fcba4fd185c"
        },
        {
            "source": "amazon-inspector",
            "modified_time": "2026-08-04T21:45:59Z",
            "versions": [
                "1.0.1"
            ],
            "sha256": "f10eded6dcf01b6124157b32fa2341e4dab71dbac8292322433793df23fd0106",
            "id": "IN-MAL-2026-011194",
            "import_time": "2026-08-04T22:30:04.390192002Z"
        },
        {
            "sha256": "ff0a11feb828f0a0d4f2baf885ad43b74dc4fb8ed2223c9cb3bbcc8ceeba53a9",
            "modified_time": "2026-08-04T21:45:51Z",
            "versions": [
                "1.0.0"
            ],
            "source": "amazon-inspector",
            "id": "IN-MAL-2026-011193",
            "import_time": "2026-08-04T22:30:04.223363718Z"
        }
    ]
}
References
Credits

Affected packages

npm / eth-codergen

Package

Name
eth-codergen
View open source insights on deps.dev
Purl
pkg:npm/eth-codergen

Affected ranges

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

Affected versions

1.*
1.0.0
1.0.1
1.0.2

Database specific

cwes 
[
    {
        "cweId": "CWE-506",
        "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.",
        "name": "Embedded Malicious Code"
    },
    {
        "cweId": "CWE-506",
        "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.",
        "name": "Embedded Malicious Code"
    }
]
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/eth-codergen/MAL-2026-11033.json"
indicators 
{
    "evidence_files": [
        {
            "path": "index.js",
            "sha256": "38de1f04d737182b9c5f87d7aff8b0e6f778fe14c1407c38b915e8da2fb610fb",
            "tlsh": "0ae3bb4029927428a90dc1e245b88ffec747599ea748b85fe142e4daf1f4bf354fca18"
        },
        {
            "path": "package.json",
            "sha256": "f2142414d1b0c033b7534cf7394ddda10a71f19026b34ef5070f6db99b019bb1",
            "tlsh": "2e012400d828ae3705dda5a55869419ba1349c0b9948bc1d3387835d4b4d82f22b9a5e"
        }
    ]
}