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Incident

Attackers hijack Jscrambler NPM credentials to distribute Rust infostealer targeting AI tools

Attackers compromised Jscrambler's NPM credentials and published malicious versions 8.14.0 through 8.20.0 containing a Rust-based infostealer. The malware executes via a preinstall hook, scanning for Cursor and Claude Desktop configurations to steal API keys and developer history. The attack exploits NPM's lifecycle script permissions, affecting any developer running npm install.

3 engagement·1 source·Mon, Jul 13, 2026, 04:13 AM
On July 13, 2026, the Jscrambler NPM package was compromised via credential theft. Malicious versions 8.14.0 through 8.20.0 were released, each containing an undocumented preinstall hook that downloads and executes a native, cross-platform Rust binary. The infostealer specifically targets local folder configurations of Cursor and Claude Desktop, harvesting API keys and developer history. The attack leverages a structural flaw in NPM where lifecycle scripts execute arbitrary binaries with the same permissions as the developer. Remediation involves upgrading to a patched version beyond 8.20.0.

Entities

Cursor(tool)Claude Desktop(tool)Jscrambler(company)NPM(tool)Rust infostealer(concept)

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