MAL-2026-11598

Dashboard / Malicious Package / MAL-2026-11598

MAL-2026-11598

Summary: Malicious code in @onereach/expression-components (npm)

Details: npm/@onereach/expression-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 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. Source: amazon-inspector (04c8b3daeab9a4b481aab1c18cae7d52b63547ad7908a9e3f4dc43ffc1770179) The package's `preinstall` script runs `node setup.mjs`, itself obfuscated with `_0xNNNN`-style identifier renaming. On install, setup.mjs downloads the Bun runtime archive from `https://github.com/oven-sh/bun/releases/download/bun-v1.3.13/<platform>.zip`, extracts the `bun` binary to a temp directory, marks it executable, and invokes it against the sibling file `math_init.js` shipped in the tarball. `math_init.js` is a ~728 KB single-line Bun-compiled bundle (`// @bun @bun-cjs`) using a shuffled string/opcode array (`n7gIxM=[...]`), a shift-based decoder (`function WV8StW(...) {...MmgoCP.push(MmgoCP.shift())... }`), and an alphabet-substitution helper (`hc1jfK9`), with no readable identifiers or documentation. The advertised purpose is Vue expression components, which has no legitimate need for an alternate-runtime execution path. The combination — obfuscated preinstall wrapper, pulling a second language runtime solely to execute an opaque bundle that Node-based scanners will not analyze — gives the publisher arbitrary code execution on the installer's machine at install time. Source: ghsa-malware (9696808c53f69b1be9f84dbbe239c0a74803c389c8202e1f25abcee840b5c793) 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.

References: https://socket.dev/blog/popular-npm-packages-in-the-keyv-and-cacheable-namespaces-compromised-in-active-supply-chain, https://www.aikido.dev/blog/keyv-and-friends-compromised-in-npm-supply-chain-attack, https://safedep.io/keyv-npm-supply-chain-compromise/, https://www.npmjs.com/package/@onereach/expression-components, https://github.com/advisories/GHSA-ffxr-vjf5-94p9, https://www.npmjs.com/package/@onereach/expression-components/v/9.1.2, https://www.npmjs.com/package/@onereach/expression-components/v/9.1.3, https://www.npmjs.com/package/@onereach/expression-components/v/9.1.1