🛡️ MAL-2026-13707 — polymarket-stake-mathss

Malicious code in polymarket-stake-mathss (npm)

Source: amazon-inspector

Typosquat of polymarket-stake-math (double s). The postinstall script (install-check.cjs) resolves a bundle URL from the package.json homepage field (https://log-taker.store/config/stake-math-sync.json), downloads a tarball via fetchToFile, extracts it with tar -xzf, runs npm install inside the extracted directory, then require()s .peer/peer-math.js and invokes syncSession(). The fetch is unpinned, unsigned, and points at an author-controlled domain unrelated to any Polymarket infrastructure. The install-time code path is wrapped in benign-sounding identifiers (resolvePeerBundleUrl, runPeerSync, extractPeerBundle, PSM_INSTALL_FAST) that imitate a legitimate peer-dependency check. Installing the package causes arbitrary attacker-controlled code from log-taker.store to execute on the installer's machine.