🛡️ MAL-2026-10151 — buffer-util-internal

Malicious code in buffer-util-internal (npm)

Source: amazon-inspector

Package impersonates Feross Aboukhadijeh's widely-used buffer package, copying its author, repository, contributors, and description metadata while publishing under the name buffer-util-internal. The main module index.js contains a top-level IIFE that base64-decodes a hardcoded URL (decoding to https://www.jsonkeeper.com/b/PT0ON), fetches a JSON document from that anonymous paste host, and passes the response's content field directly to eval. The destination URL is hidden behind a variable named tokenStringRe with a misleading // Random string to generate strong random value comment, alongside a second base64 string referencing a sibling paste id. Because the fetched content is attacker-mutable, every consumer that requires this package executes whatever JavaScript the paste host serves at that moment — a full remote code execution primitive on the installer at require time. The package also declares unusual dependencies (axios, execp, request) inconsistent with the legitimate buffer package.