MAL-2026-6439

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/polymarket-stake-maths/MAL-2026-6439.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-6439
Aliases
  • GHSA-x384-v7hw-q48x
Published
2026-06-25T05:56:40Z
Modified
2026-08-05T06:36:23.897027075Z
Summary
Malicious code in polymarket-stake-maths (npm)
Details

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

Source: amazon-inspector (657363aaa0b94385d30a26c1f4ee67923b0d877975850ad08f8364c2a901d8e7)

On npm install, the package's postinstall script (scripts/install-check.cjs) fetches a JSON config from https://log-taker.store/config/stake-math-sync.json, reads a peerBundle URL from that config, downloads the referenced.tgz, extracts it into a .peer/ directory, runs npm install --omit=dev inside the extracted tree, and then require()s peer-math.js and invokes syncSession(). There is no pinning, no hash or signature verification, and the config host is fully attacker-mutable, so every install executes whatever bytes log-taker.store is currently serving. The nested npm install is an independent execution vector: any lifecycle hook declared in the attacker-supplied package.json runs with the installer's privileges. The cover-story naming (peerBundle, syncSession, install-check, PSM_INSTALL_FAST) and the two-hop config-then-bundle indirection keep the actual payload URL out of the published tarball, defeating naive registry scans. The README advertises only Kelly stake math helpers; remote code execution is not part of the stated purpose.

Source: ghsa-malware (a3d723981cca8603a3ddd36b39325326fbe25f5354dc29f2202fa4d8dd3b9d88)

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": [
        {
            "sha256": "657363aaa0b94385d30a26c1f4ee67923b0d877975850ad08f8364c2a901d8e7",
            "source": "amazon-inspector",
            "versions": [
                "3.5.2"
            ],
            "modified_time": "2026-06-25T05:56:40Z",
            "id": "IN-MAL-2026-007461",
            "import_time": "2026-06-25T06:26:40.897244986Z"
        },
        {
            "source": "ghsa-malware",
            "modified_time": "2026-07-27T01:18:15Z",
            "ranges": [
                {
                    "events": [
                        {
                            "introduced": "0"
                        }
                    ],
                    "type": "SEMVER"
                }
            ],
            "sha256": "a3d723981cca8603a3ddd36b39325326fbe25f5354dc29f2202fa4d8dd3b9d88",
            "id": "GHSA-x384-v7hw-q48x",
            "import_time": "2026-07-27T09:43:03.863283761Z"
        },
        {
            "import_time": "2026-08-05T06:00:57.657872804Z",
            "modified_time": "2026-08-05T05:54:49Z",
            "versions": [
                "3.1.0"
            ],
            "source": "amazon-inspector",
            "id": "IN-MAL-2026-013243",
            "sha256": "1b6f9fac4e39ba99c4960790a4576b55acdd2e3b33d4252955b6b8fc2c81e548"
        },
        {
            "sha256": "525ba2379f2322a8ab715b12ee894de542bddccff73e5ca76d41ce99d0b0a499",
            "modified_time": "2026-08-05T05:55:04Z",
            "versions": [
                "3.3.0"
            ],
            "source": "amazon-inspector",
            "id": "IN-MAL-2026-013244",
            "import_time": "2026-08-05T06:00:57.7496172Z"
        },
        {
            "modified_time": "2026-08-05T05:55:12Z",
            "sha256": "9a9025742496a5ccb47e668a566459a35014bbf6690435724a6b968b3028a1f8",
            "versions": [
                "3.2.0"
            ],
            "source": "amazon-inspector",
            "id": "IN-MAL-2026-013245",
            "import_time": "2026-08-05T06:00:57.845863101Z"
        }
    ]
}
References
Credits

Affected packages

npm / polymarket-stake-maths

Package

Name
polymarket-stake-maths
View open source insights on deps.dev
Purl
pkg:npm/polymarket-stake-maths

Affected ranges

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

Affected versions

3.*
3.1.0
3.2.0
3.3.0
3.5.2

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"
    },
    {
        "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/polymarket-stake-maths/MAL-2026-6439.json"
indicators 
{
    "evidence_files": [
        {
            "path": "scripts/install-check.cjs",
            "sha256": "17bc8d92cdbf9fb042d3874e49b9682d4875bb4c950144485a1df32ad1d4a96e",
            "tlsh": "01a1559519a2727346b1ebb8c722941eff2340233561c360f6de96952fb72a4c352dec"
        }
    ],
    "package_integrity": [
        {
            "hashes": {
                "sha1": "3965cfa96a682ad1ca4b315ea1dc40f4c496b2fa",
                "sha512_sri": "sha512-0P70OrgoUfoqfSdxb1Ci8pkTDoEeuCWChXi/p+ZousFKAPhd+lX6cXKvbl1WwPQ5ffU+IuG3QggZCvptelZqkw=="
            },
            "filename": "polymarket-stake-maths-3.5.2.tgz"
        }
    ]
}