MAL-2026-12129 Malicious code in accounts-appointment (npm)
Malicious package
Published
MAL-2026-12129 is a malicious package: accounts-appointment (npm). Every version was published to cause harm.
Task:
1. Search this repository's dependency manifests and lockfiles for the package, including transitive dependencies.
2. If it is present, remove it, regenerate the lockfile with the project's package manager, and replace whatever it was used for.
3. List any CI runners, developer machines or containers that installed it, so their secrets can be rotated.
4. If the package is not used anywhere, say so and change nothing.
Reference: https://insights.sbomify.com/MAL-2026-12129/ (Markdown: https://insights.sbomify.com/MAL-2026-12129/index.md)
- Package
- accounts-appointment
- Registry
- npm
What is MAL-2026-12129?
MAL-2026-12129 is a malicious package in accounts-appointment, published on 5 Aug 2026.
Official description
index.js unconditionally requires./setup, which on load selects a platform-specific payload path, fetches bytes over HTTPS from Cloudflare workers.dev subdomains (oob-worker.cf99-9b3.workers.dev and siblings cf100-416/cf101-adf/cf103-070.workers.dev) with a DNS TXT-record fallback channel under *.dl.well1.site, writes the payload to /var/tmp or %TEMP% under decoy names resembling.NET diagnostic files (.cache_<hex> / dotnet_diag_<hex>.exe), chmods 0755 on unix, and spawns the file detached via /bin/sh -c or cmd.exe /c start. Endpoint hostnames are assembled via array-join string concatenation to evade static string search, and a secondary DNS TXT loader queries c.<domain> for a chunk count and reassembles base64 chunks from N.<domain> TXT records. The dropper fires on any require/import of the package and executes attacker-controlled code on the installer's host.
What should I do about MAL-2026-12129?
Remove the package from your dependencies and lockfiles, then rotate any secrets on machines where it was installed.