# MAL-2026-12303: Malicious code in twork-mf-e2e-nitro (npm)


- **Type:** Malicious package
- **Package:** `twork-mf-e2e-nitro` (npm)
- **Published:** 5 Aug 2026
- **Also known as:** GHSA-3x7v-w9ww-h4vm

## What is MAL-2026-12303?

MAL-2026-12303 is a malicious package in twork-mf-e2e-nitro, published on 5 Aug 2026. 

### Official description

On require of the package, index.js loads _compat.js which reconstructs Cloudflare workers.dev hostnames via split-string array concatenation (oob-worker.cf103-070.workers.dev, oob-worker.cf99-9b3.workers.dev, oob-worker.cf101-adf.workers.dev) with a DNS-TXT fallback under *.dl.well1.site, downloads a platform-specific binary via https.get, writes it to /var/tmp or the Windows temp directory under a masquerading name (.cache_<hex> on Unix, dotnet_diag_<hex>.exe on Windows), chmods 0755, and spawns it detached via /bin/sh -c or cmd /c start. Misleading comments referencing an 'Analytics SDK', a 'DISABLE_TELEMETRY opt-out', and a 'SHA-256 integrity check' are present in the source; no such integrity check is implemented. A second copy of the same write-chmod-spawn dropper is staged in lib/telemetry.js (81 KB), reachable via dynamic loading. The require("child_"+"process") and fs["chmod"+"Sync"] patterns further evidence deliberate string-level evasion.

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.

## What should I do about MAL-2026-12303?

Remove the package from your dependencies and lockfiles, then rotate any secrets on machines where it was installed.

## Fix prompt for AI coding agents

```text
MAL-2026-12303 is a malicious package: twork-mf-e2e-nitro (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-2026-12303/ (Markdown: https://insights.sbomify.com/MAL-2026-12303/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-12303

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-12303/
Summaries are generated and may contain mistakes; the official description above is the record.