MAL-2026-11661 Malicious code in @onereach/ui-components-common (npm)

npm/@onereach/ui-components-common is affected by the large-scale, self-propagating npm supply-chain worm of 2026-08-04 (the "Shai-Hulud: Here We Go Again" wave) — the same campaign that began with the compromise of the keyv and cacheable maintainer account. The listed version(s) were trojanized and republished by the worm after it reached an npm publish token belonging to a maintainer in this namespace; the payload enumerates every package a stolen token controls and republishes each with the same hook, so many packages under this scope were poisoned in the same short window. Every poisoned release adds a preinstall hook ("preinstall": "node setup.mjs") that runs on a bare npm install, before any project code. setup.mjs downloads a standalone Bun runtime and runs a byte-identical, heavily obfuscated ~728 KB second-stage credential stealer (shipped as Math_Symbol.js / math_init.js). It harvests GitHub, npm, AWS, GCP, Azure, HashiCorp Vault and Kubernetes credentials plus generic secrets and private keys (TruffleHog-style sweep), reads CI/CD secrets and identifies build runners, then republishes further packages the stolen token can reach. Rather than a fixed command-and-control host, it exfiltrates stolen findings to attacker-created GitHub repositories (descriptions reading "Shai-Hulud: Here We Go Again") and over DNS. Treat any environment that installed an affected version (with install scripts enabled) as compromised: rotate and revoke all reachable credentials (npm and GitHub tokens, cloud keys, Vault/Kubernetes secrets, and CI org/repo secrets). Part of the August 2026 npm worm that poisoned 400+ packages across many organizations.

The package declares a preinstall hook (node setup.mjs) that runs on npm install. setup.mjs is obfuscated with obfuscator.io-style _0xNNNN identifier mangling and per-function string dictionaries containing tokens like ldd, /etc/os-release, Alpine, powershell, -ExecutionPolicy, and Expand-Archive — indicating cross-platform (Linux/Alpine/Windows) environment detection. It downloads the Bun runtime from https://github.com/oven-sh/bun/releases/download/bun-v<version>/..., extracts it to a temp directory, chmods it executable, and then execFileSyncs Bun against a sibling file math_init.js. math_init.js is a 727 KB single-line Bun-compiled bundle (// @bun @bun-cjs) with a scrambled string-array constant pool, a rotation function that permutes the array, and a custom alphabet-remap decoder — its behavior cannot be inspected without executing the decoder. math_init.js is not listed in package.json files (["dist","src","./shims.d.ts","./tsconfig.components.json"]) yet ships in the tarball root. The advertised purpose is a Vue UI-components library, which has no legitimate need to fetch a second language runtime at install time solely to execute a bundled opaque script. The alternate-runtime choice bypasses Node-based install-time scanners; the obfuscation on both the loader and the payload conceals the ultimate behavior. This is the alternate-runtime-dropper pattern executing arbitrary attacker-controlled code on the installer's machine at npm install time.

Any computer that has this package installed or running should be considered fully compromised. All secrets and keys stored on that computer should be rotated immediately from a different computer. The package should be removed, but as full control of the computer may have been given to an outside entity, there is no guarantee that removing the package will remove all malicious software resulting from installing it.