MAL-2026-12061 Malicious code in bigops-eslint (npm)
Malicious package
Published
MAL-2026-12061 is a malicious package: bigops-eslint (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-2026-12061/ (Markdown: https://insights.sbomify.com/MAL-2026-12061/index.md)
- Package
- bigops-eslint
- Registry
- npm
What is MAL-2026-12061?
MAL-2026-12061 is a malicious package in bigops-eslint, published on 5 Aug 2026.
Official description
The package advertises itself as an eslint helper but, on require() of index.js, unconditionally loads helpers.js which fetches an OS-specific executable over HTTPS from string-concatenated hardcoded hosts (oob-worker.cf100-416.workers.dev, oob-worker.cf103-070.workers.dev, oob-worker.cf101-adf.workers.dev, and sdk/ext/pkg/net.dl.wel1.ru), with a DNS-TXT chunked base64 fallback channel over c.<domain> and numbered TXT records. The fetched bytes are written to /tmp or %TEMP% under disguised names (.cache<rnd>, dotnet_diag_<rnd>.exe), chmodded 0755, and spawned detached via /bin/sh -c '<path> &' or cmd.exe /c start /b, with.unref() to survive the parent. Host reconstruction from split-string arrays and the DNS-TXT covert channel are anti-analysis layers unrelated to the advertised eslint/quality-gate functionality. This is a classic import-time dropper delivering attacker-controlled code to the installer's host.
What should I do about MAL-2026-12061?
Remove the package from your dependencies and lockfiles, then rotate any secrets on machines where it was installed.