MAL-2026-6587

    Dashboard / Malicious Package / MAL-2026-6587

    MAL-2026-6587

    Published: 29 Jun 2026Last Modified: 9 Jul 2026

    Summary: Malicious code in clob-client-math (npm)

    Details: Source: amazon-inspector (b36bbf14a743630a93ba7f8d7529d3fae8073f0f585af4343506be6248fc1b59) [email protected] 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.

    References: https://www.npmjs.com/package/clob-client-math/v/1.0.0, https://www.npmjs.com/package/clob-client-math/v/1.0.1

    Affected packages

    Package

    Name: clob-client-math

    Purl: pkg:npm/clob-client-math

    Affected ranges

    Type: SEMVER

    Events:

    Introduced- 0
    Fixed -None

    Affected versions

    1.0.0
    1.0.1
    MAL-2026-6587 | CVE-DB