MAL-2026-11605

npm/@onereach/idw-ui-components 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 (31a3e4ddc00fec14f6d8972757e768d6b7743225a6313f0a0048c1d90a4ba9b5)

package.json declares scripts.preinstall = 'node setup.mjs'. setup.mjs is itself obfuscated with obfuscator.io-style hex identifiers (0x... variables, per-function alias tables mapping method calls and string constants such as '--version', '/etc/os-release', 'Alpine'). It constructs a URL of the form https://github.com/oven-sh/bun/releases/download/bun-v<version>/<platform>.zip, downloads the Bun runtime binary, chmods it 0755, and then execFileSyncs the Bun binary against a bundled sibling file mathinit.js in the package directory. mathinit.js is a ~730 KB single-line file tagged '// @bun @bun-cjs' with mangled identifiers, a ~thousand-entry string/number constant table, and a rotation function (WV8StW) that shifts that table — a heavily obfuscated Bun-compiled payload. The package is advertised as a UI-components library and has no functional need for an alternate JavaScript runtime; the effect of npm install @onereach/idw-ui-components is to fetch a runtime specifically to execute a concealed payload that Node-based scanners do not inspect. Both the preinstall dropper and the executed payload are obfuscated, and the payload's name ('mathinit') is unrelated to the stated UI purpose.

Source: ghsa-malware (1eace483be8eea721e54ca46b6c2e0a3a9a5b48bed630479af3ee5eaf483f2e2)

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.