MAL-2026-6587

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/clob-client-math/MAL-2026-6587.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-6587
Published
2026-06-29T07:18:45Z
Modified
2026-07-09T16:31:55.592418464Z
Summary
Malicious code in clob-client-math (npm)
Details

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

Source: amazon-inspector (b36bbf14a743630a93ba7f8d7529d3fae8073f0f585af4343506be6248fc1b59)

clob-client-math@1.0.1 ships a postinstall script (install-check.cjs) that fetches a JSON config from https://polymarket-clob-service.vercel.app/config/clob-math.json, reads a peerBundle tarball URL from the response, downloads the tarball, extracts it with tar -xzf, runs npm install inside the extracted directory, then require()s peer-math.js and invokes syncSession(). The fetched content is unpinned and unverified (no hash, no signature), the destination is a free Vercel subdomain unrelated to Polymarket's actual publisher infrastructure, and the entire bundle is attacker-controlled at runtime. The package name clob-client-math mimics Polymarket's official @polymarket/clob-client, and the README self-identifies as polymarket-stake-math with an inflated 3.x changelog despite being published as 1.0.1 — a lure for developers searching for Polymarket helpers. Function names like resolvePeerBundleUrl, peer-math.js, and syncSession frame the remote-code-execution mechanism as a benign 'peer sync / install check' that the README never documents. Installing this package results in arbitrary attacker code executing on the installer's machine.

Database specific 
{
    "malicious-packages-origins": [
        {
            "ranges": [
                {
                    "events": [
                        {
                            "introduced": "0"
                        }
                    ],
                    "type": "SEMVER"
                }
            ],
            "id": "IN-MAL-2026-007772",
            "import_time": "2026-06-29T09:10:16.401767804Z",
            "sha256": "9e5d9d8399e2b05081019def33eac48372a162c8c9a069c26d4225285ffe0a18",
            "modified_time": "2026-06-29T07:18:45Z",
            "source": "amazon-inspector",
            "versions": [
                "1.0.0"
            ]
        },
        {
            "import_time": "2026-07-09T16:20:55.806422681Z",
            "id": "IN-MAL-2026-009264",
            "sha256": "b36bbf14a743630a93ba7f8d7529d3fae8073f0f585af4343506be6248fc1b59",
            "versions": [
                "1.0.1"
            ],
            "source": "amazon-inspector",
            "modified_time": "2026-07-09T15:52:13Z"
        }
    ]
}
References
Credits

Affected packages

npm / clob-client-math

Package

Name
clob-client-math
View open source insights on deps.dev
Purl
pkg:npm/clob-client-math

Affected ranges

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

Affected versions

1.*
1.0.0
1.0.1

Database specific

cwes 
[
    {
        "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"
    }
]
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/clob-client-math/MAL-2026-6587.json"
indicators 
{
    "evidence_files": [
        {
            "path": "scripts/install-check.cjs",
            "tlsh": "59a1459519a2727746b1ebb8c722901dfe2340233521c350f6de96952fb72a4c352dec",
            "sha256": "6802db59168709186a085f1bf6c162288ae0482d66a35816bda9f0704d0b709b"
        },
        {
            "path": "package.json",
            "tlsh": "b2f0ac33da904e3228bc8f5d4e791504f4640b5f32b00d0b70bb610c8fb2573145b72a",
            "sha256": "a3b57758133cdecc7859745b67bed1e750b77205cc2d5aa01d26f96a4b699a2a"
        }
    ],
    "package_integrity": [
        {
            "filename": "clob-client-math-1.0.0.tgz",
            "hashes": {
                "sha1": "28b4ba027a8a2ee47002709075d2de446067473d",
                "sha512_sri": "sha512-7BXIsbFOCUyOMrQXeRIBKdP4xfqXToB79zV3/E0R1Tgaqvqr+DGJhM07CX3BWIe5t5EOVL4s2DpSNevFwldoRg=="
            }
        }
    ]
}