🛡️ MAL-2026-10045 — chai-as-sharpened

Malicious code in chai-as-sharpened (npm)

Source: amazon-inspector

On require, the package spawns a detached background node process running lib/initializeCaller.js. That script base64-decodes a hardcoded URL (https://tomato-brunhilda-40.tiiny.site/index.json), fetches JSON from it, and executes the returned cookie field through new Function.constructor('require', response)(require) — giving the remote payload full require access on the installer's host. The endpoint URL and request header key/value are hidden inside base64 strings assigned to a locally-shadowed process.env object and decoded via atob() at runtime, obfuscating the C2 destination. The package additionally impersonates two well-known libraries: the name chai-as-sharpened mimics chai-as-promised, and the README badges/links point to pino and pinojs/pino, using name confusion as the delivery vector. Import triggers unconditional RCE against any consumer.