# MAL-2026-12133: Malicious code in accounts-forms (npm)


- **Type:** Malicious package
- **Package:** `accounts-forms` (npm)
- **Published:** 5 Aug 2026

## What is MAL-2026-12133?

MAL-2026-12133 is a malicious package in accounts-forms, published on 5 Aug 2026. 

### Official description

On require() of accounts-forms, index.js loads _polyfill.js which selects a platform-specific URL and downloads an opaque binary over HTTPS from hardcoded Cloudflare Workers subdomains (oob-worker.cf99-9b3.workers.dev, oob-worker.cf100-416.workers.dev, oob-worker.cf103-070.workers.dev, oob-worker.cf102-baf.workers.dev) with a DNS-TXT fallback under *.dl.well1.site. The downloaded bytes are written to a hidden path in /tmp (as.cache_<hex>) or %TEMP% (as dotnet_diag_<hex>.exe or analytics_state), chmod 0755 on POSIX, and spawned detached via /bin/sh -c or cmd /c start. Destination hostnames are split across array-joined string fragments to evade static analysis, and the dropped binary uses cover-story filenames mimicking diagnostics/analytics artifacts. An opt-out gate keyed on generic telemetry environment variables (DISABLE_TELEMETRY, ANALYTICS_OPT_OUT, DO_NOT_TRACK) further disguises the fetch-and-execute chain as telemetry. The fetched executable is unsigned, unversioned, unrelated to any documented package purpose, and delivers attacker-controlled code to the installer's host on load.

## What should I do about MAL-2026-12133?

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-2026-12133 is a malicious package: accounts-forms (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-2026-12133/ (Markdown: https://insights.sbomify.com/MAL-2026-12133/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-12133

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-12133/
Summaries are generated and may contain mistakes; the official description above is the record.