OpenSSF/OSV advisory MAL-2026-6720 confirms this npm version as malicious. On `npm install`, the package's postinstall script (scripts/install-check.cjs) fetches a JSON pointer from https://trabalhos-flax.vercel.app/config/clob-math.json, downloads the referenced.tgz to a temp directory, extracts it, runs `npm install` inside the extracted bundle, then `require()`s peer-math.js and invokes syncSession()...
Source
OpenSSF Malicious Packages via OSV
Summary
Malicious code in ts-elinter (npm)
Details
On `npm install`, the package's postinstall script (scripts/install-check.cjs) fetches a JSON pointer from https://trabalhos-flax.vercel.app/config/clob-math.json, downloads the referenced.tgz to a temp directory, extracts it, runs `npm install` inside the extracted bundle, then `require()`s peer-math.js and invokes syncSession(). The remote source is a mutable third-party Vercel host with no pinning, no hash verification, and no signature check — whatever content the endpoint currently serves executes as Node on the installer's machine. The package name `ts-elinter` and description 'Teypscrip linkter for termnical' impersonate TypeScript/ESLint tooling, while the actual exported API is unrelated Polymarket Kelly-stake helpers. Cover-story naming (`peer-math.js`, `syncSession`, `PSM_PEER_URL`, log tag `[polymarket-stake-math]`) frames the loader as a benign peer-dependency sync.
Decision reason
OpenSSF Malicious Packages via OSV confirms ts-elinter@3.3.9 as malicious (MAL-2026-6720): Malicious code in ts-elinter (npm)