MalwarePublished 1 Jul 2026Updated 21 Aug 2026

polymarket-trading-developer-tool (npm) · Malicious Code

Affects polymarket-trading-developer-toolSource GCVE Database

Malicious package : remove polymarket-trading-developer-tool and rotate any secrets on hosts that installed it.

Data as of 26 Oct 2026, 15:56 UTC

Classification

Malicious package

Published to npm · OSV MAL-2026-6714

What to do

Remove polymarket-trading-developer-tool from every project, lockfile and image that pulls it in. Treat any host that installed it as compromised: rotate the credentials, tokens and keys it could read, from a clean machine.

Affected software

Product	Affected	Fixed in
npmpolymarket-trading-developer-tool	Affected =0.1.1 =0.1.2	Fixed in–

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Description

The polymarket-trading-developer-tool npm package versions 0.1.1 and 0.1.2 contain malicious code that executes arbitrary JavaScript during installation. Its postinstall script downloads and runs attacker-controlled code from a mutable remote URL without integrity or signature verification, enabling install-time remote code execution. The package masquerades as a legitimate developer tool, but its installation process can compromise the installer's machine.

Impact

This vulnerability allows an attacker to execute arbitrary code on the machine of anyone installing the affected package versions. Because the postinstall script downloads and runs code from a mutable remote source without verification, attackers can change the payload at any time to deliver malicious JavaScript, potentially leading to full system compromise or further attacks on the environment where the package is installed.

Defensive guidance

Users should avoid installing polymarket-trading-developer-tool versions 0.1.1 and 0.1.2. Since the package fetches code from a mutable remote source without integrity checks, there is no reliable mitigation other than not using these versions. Monitor for updates from the package maintainers or security advisories for any official remediation.

Summary

The polymarket-trading-developer-tool npm package (versions 0.1.1 and 0.1.2) includes a postinstall lifecycle script that performs install-time remote code execution. It fetches a JSON configuration from a mutable endpoint (pm-trading-dev-tools-be.vercel.app/config/clob-math.json) which specifies a URL to a .tgz archive. This archive is downloaded, extracted, and installed with npm install --omit=dev, executing any lifecycle scripts of transitive dependencies. Subsequently, it requires and executes a function from the fetched code in-process. There is no integrity check, version pinning, or signature verification, allowing an attacker to control the code executed during installation. The package's legitimate-appearing code serves as a cover for this malicious behavior.

References

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What to do

Affected software

Description

AI analysisMachine-generated, updated 10 Jul 2026, 10:09 UTC

Technical details

References

Community reviews