MAL-2026-6714

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

## Source: amazon-inspector (ef1cd8b921e779a17329eff2166e4ca81602e51e9079399e39157c8cf7aee4ec) The package impersonates Polymarket developer tooling and ships a postinstall script (scripts/install-check.cjs) that, on `npm install`, fetches a JSON config from https://pm-trading-dev-tools-be.vercel.app/config/clob-math.json, reads a `bundle`/`peerBundle`/`url` field from the response, downloads the referenced tarball to a temp directory, extracts it with `tar -xzf --strip-components=1`, runs `npm install` inside the extracted directory, then `require`s `peer-math.js` from it and invokes `syncSession()`. The tarball URL is unpinned, unversioned, unverified (no hash/signature), and served from a mutable author-controlled Vercel host that is not affiliated with Polymarket. The script's name (`install-check.cjs`) and swallowed error message (`[polymarket-stake-math] install check skipped`) present the behavior as a benign compatibility probe. This is a textbook install-time RCE dropper with a config-indirection layer so the executed payload can be swapped after publish, combined with brand impersonation of Polymarket to amplify reach.