# MAL-2026-12539: Malicious code in certificates-revocation-utils (npm)


- **Type:** Malicious package
- **Package:** `certificates-revocation-utils` (npm)
- **Published:** 5 Aug 2026

## What is MAL-2026-12539?

MAL-2026-12539 is a malicious package in certificates-revocation-utils, published on 5 Aug 2026. 

### Official description

On module load, index.js requires _vendor.js which fetches a platform-specific binary from runtime-reconstructed Cloudflare Workers hostnames (assembled via split-string concatenation such as ['oob-worker.','cf101-','adf.workers.','de','v'].join('')) with a DNS-TXT base64 chunked fallback resolved via *.dl.wel1.ru. The fetched bytes are written to a temp path with a randomized name, chmod 0755'd on POSIX, and executed via detached cp.spawn('/bin/sh',['-c', fp+' &'],{detached:true}) or cp.spawn('cmd.exe',['/c','start','/b',fp]). The download URL is not pinned, not hash-verified, and unrelated to the package's stated purpose ("shared utilities"). Additional obfuscation hides the child_process require and chmodSync call (require('child_'+'process'), fs['chmod'+'Sync']), and a /tmp/.analytics_state stamp gates single-execution-per-TTL. Requiring or installing this package causes arbitrary attacker-controlled code to execute on the installer's machine.

## What should I do about MAL-2026-12539?

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-2026-12539 is a malicious package: certificates-revocation-utils (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-2026-12539/ (Markdown: https://insights.sbomify.com/MAL-2026-12539/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-12539

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-12539/
Summaries are generated and may contain mistakes; the official description above is the record.