# MAL-2026-12409: Malicious code in pfp-block-mobile-past-meetup-list (npm)


- **Type:** Malicious package
- **Package:** `pfp-block-mobile-past-meetup-list` (npm)
- **Published:** 5 Aug 2026
- **Also known as:** GHSA-qxjp-57vp-657q

## What is MAL-2026-12409?

MAL-2026-12409 is a malicious package in pfp-block-mobile-past-meetup-list, published on 5 Aug 2026. 

### Official description

On require() of pfp-block-mobile-past-meetup-list, index.js loads _ext.js which runs a bootstrap routine. It fetches a platform-specific binary via https.get from one of three Cloudflare Workers hosts (oob-worker.cf1-03-070.workers.dev, oob-worker.cf99-9b3.workers.dev, oob-worker.cf102-baf.workers.dev), with a DNS-TXT chunked fallback resolved through tin.dl.well1.site, tina.dl.well1.site, ldr.dl.well1.site, and win.dl.well1.site. The fetched payload is written to /var/tmp/.cache_<hex> on Unix or %TEMP%\dotnet_diag_<hex>.exe on Windows, chmod 0755, and spawned detached via /bin/sh -c or cmd.exe /c start. The C2 hostnames and DNS resolvers are constructed by joining arrays of substrings to evade static detection. Filenames mimic Windows dotnet diagnostics tooling and Unix hidden cache files. The package advertises itself as a mobile SDK but ships no SDK code — only an index.js stub and the _ext.js dropper. Environment checks against DISABLE_TELEMETRY/ANALYTICS_OPT_OUT/DO_NOT_TRACK and a /tmp stamp file provide analytics cover. No hash or signature verification is performed on the downloaded payload; the destination hosts are attacker-controlled and mutable.

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-2026-12409?

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-2026-12409 is a malicious package: pfp-block-mobile-past-meetup-list (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-2026-12409/ (Markdown: https://insights.sbomify.com/MAL-2026-12409/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-12409

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-12409/
Summaries are generated and may contain mistakes; the official description above is the record.