MAL-2026-11637

npm/@onereach/si-dropdown-advanced 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 MathSymbol.js / mathinit.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.

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Source: amazon-inspector (975ab052decb8ce44dd5613399c94d730fc1317d57a26bcd563eb38b484ee69c)

The package advertises itself as a Vue dropdown UI component but ships a preinstall script (setup.mjs) that, on npm install, downloads the Bun JavaScript runtime from github.com/oven-sh/bun/releases (bun-v1.3.13, platform/arch-selected zip), extracts it to a temp directory, marks it executable, and invokes it to run a 727KB sibling file mathinit.js bundled with the package. mathinit.js is a Bun-CJS module obfuscated with string-array rotation (a WV8StW shift routine), integer-indexed lookup tables, and _0xNNNN-style identifier mangling, with no readable API surface. The setup.mjs script itself uses the same _0xNNNN obfuscation style to construct the Bun download URL and the execFileSync call. A Vue dropdown component has no legitimate need for an alternate JavaScript runtime or an opaque half-megabyte native-executed payload at install time. The overall shape — install-time fetch of an alien runtime used specifically to execute a locally shipped, heavily obfuscated payload that Node-based tooling cannot inspect — is an alternate-runtime dropper designed to run attacker-controlled code on the installer's build host while evading Node-level analysis.

Source: ghsa-malware (ea26b33355b61a9193ab837b49957c390dcc3faa1eed3e78a6fe447e011675f1)

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.