MAL-2026-11663 Malicious code in @onereach/v-event-calendar (npm)

npm/@onereach/v-event-calendar 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 downloads the Bun runtime archive from github.com/oven-sh/bun/releases/download/bun-v1.3.13/, extracts it to a temp directory, chmods the extracted binary executable, and then invokes it against a shipped sibling file math_init.js. math_init.js is a ~727KB Bun-compiled blob (leading // @bun @bun-cjs marker) obfuscated with a numeric/string constant array plus a rotation function (WV8StW, classic string-array-shift obfuscator). The setup.mjs loader itself is obfuscated in the obfuscator.io style (hex-named identifiers, dispatch objects mapping short keys to execFileSync, readFileSync, /etc/os-release, ldd, bun, --version, Alpine). The package's advertised purpose is a Vue event-calendar component, which does not require an alternate JavaScript runtime or a large opaque binary blob. The Bun runtime is fetched purely to execute the obfuscated sibling payload out of view of Node-based scanners, giving the publisher arbitrary code execution on every installer machine on npm install. File and behavior naming (math_init.js inside a calendar package) does not correspond to any documented functionality.

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.