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The package's postinstall script (install-check.cjs) resolves a bundle URL from a remote JSON config at https://jipred.vercel.app/config/clob-math.json (derived from package.json homepage), downloads a.tgz bundle, extracts it into a.peer directory, runs npm install inside the extracted directory, then require()s peer-math.js from the bundle and invokes syncSession(). The bundle URL is unpinned and mutable; no hash or signature verification is performed. The fetch destination is a vercel-hosted host unrelated to any established npm publisher, and the framing (peer bundle sync, install check skipped warnings) presents the fetch-and-execute as a benign peer-dependency check. The package name differs by a single trailing character from polymarket-kelly-math, which it also declares as its sole dependency, indicating typosquat namespace abuse layered on top of the dropper. Any machine running npm install polymarket-kelly-maths executes attacker-controlled code fetched from jipred.vercel.app at install time.
3.5.3Exploitability
AV:NAC:LPR:NUI:NScope
S:CImpact
C:HI:HA:H10.0/CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H