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Malicious package

ts-clob-math-v2npm

Advisory published Updated

ts-clob-math-v2 is a confirmed malicious npm package (MAL-2026-6719) that typosquats a legitimate package to trick installs (malicious version 2.0.1). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in ts-clob-math-v2 (npm)

MAL-2026-6719
Immediate action
Remove the package, then rotate any secrets the build/runtime could reach.
npm uninstall ts-clob-math-v2

What this malware does

On npm install, the postinstall script scripts/install-check.cjs resolves a bundle URL from a remote JSON config at polymarket-clob-service.vercel.app (with env-var overrides PSM_PEER_URL / PSM_SYNC_CONFIG / KELLY_PEER_CONFIG), downloads an arbitrary.tgz to a temp directory, extracts it into a hidden .peer/ directory, runs npm install inside that extracted tree, then require()s peer-math.js from the fetched bundle and invokes syncSession(). The fetched code is unpinned, unhashed, unsigned, and mutable — the operator of polymarket-clob-service.vercel.app can serve any payload to every installer at any time. Errors are swallowed via console.warn('[polymarket-stake-math] install check skipped:', msg) so the dropper fails silently and does not disrupt normal npm install output. Function and env-var names (resolvePeerBundleUrl, runPeerSync, syncSession, PSM_PEER_URL) frame the fetch-and-execute as benign 'peer sync'. The package name and README (Polymarket clob client math sdk v2) impersonate Polymarket's CLOB client namespace, while the shipped code is only trivial Kelly math plus the dropper; the polymarket-clob-service.vercel.app host is not on a Polymarket-owned domain.

Malicious versions

1 flagged
2.0.1

Indicators of compromise (SHA-256)

99f4cf4a66881bb3bf0a0695b3cf021902b46a8c82c99102c27a779139437de9

Detection & response playbook

Typosquat

  1. Find it

    Search your lockfiles and build artifacts for ts-clob-math-v2 (version 2.0.1).

  2. If you installed it — respond

    ts-clob-math-v2 is a typosquat — you almost certainly intended a legitimately-named package. Remove ts-clob-math-v2, install the correct package, and rotate any secrets exposed during the install since post-install scripts may have already run.

  3. Did it already run?

    If ts-clob-math-v2 was installed, its post-install payload may already have run. Removing the package does not undo that — check outbound connections and credential use from the install window onward.

Frequently asked questions

No. ts-clob-math-v2 on npm has been identified as a malicious package (version 2.0.1 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

IN-MAL-2026-007881

References

Credits

  • Amazon Inspector · finder

Detect & block this

O3 blocks ts-clob-math-v2-class packages before install and in CI — and if it already ran, its runtime egress monitoring catches the malicious outbound activity and severs the channel.

Malware detection Runtime egress monitoring

Explore

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ts-clob-math-v2 (npm) malicious package — MAL-2026-6719 | O3 Security