polymarket-clob-client
Hyperliquid API SDK for all major JS runtimes, written in TypeScript.
This report shows the evidence for polymarket-clob-client@2.1.1, the only known version.
OpenSSF/OSV Malicious Advisory
imported 4mo ago · by OpenSSF/OSVOpenSSF/OSV advisory MAL-2026-4643 confirms this npm version as malicious.
Advisory
MAL-2026-4643
Source
OpenSSF Malicious Packages via OSV
Summary
Malicious code in polymarket-clob-client (npm)
Details
The package is published as `polymarket-clob-client`, an unscoped lookalike of the legitimate `@polymarket/clob-client` maintained by Polymarket, but the shipped code is the third-party Hyperliquid SDK targeting a completely different exchange. `package.json` declares `"description": "Hyperliquid API SDK for all major JS runtimes..."` and the homepage points at `github.com/nktkas/hyperliquid`. The HTTP transport in `script/transport/http/mod.js` hardcodes `https://api.hyperliquid.xyz` as the default mainnet endpoint (`exports.MAINNET_API_URL = "https://api.hyperliquid.xyz"`). A developer who installs this package believing they are integrating with Polymarket's CLOB will instead be signing wallet messages and submitting trading orders to Hyperliquid. The structural signals — a clear name-squat of a well-known DeFi brand combined with code that silently routes wallet signatures and order intent to an unrelated venue — present concrete installer harm: misdirected funds and trading actions, regardless of whether the misnaming is intentional or negligent.
References
Source & flagged code
0 flagged · loading sourceNo flagged code excerpts are attached to this scan.
Findings
1 High
HighOsv Malicious Advisory
Affected versions and remediation
This report applies to polymarket-clob-client@2.1.1.
The versions list below shows the verdict for each recorded version.
- Avoid installing polymarket-clob-client@2.1.1. Remove it from direct dependencies and check your lockfile for transitive copies.
- Choose an independently verified alternative or release. This report does not establish that other versions are safe.
- If this version ran, investigate the affected machine and build environment. Rotate credentials it could access and rebuild from a trusted environment.
Evidence last updated: .
Source advisory published: .
This report uses published external intelligence. The advisory does not provide a separate source-code analysis for each listed version.
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