# MAL-2026-13911: Malicious code in @years20/n8n-nodes-utils-helper-c (npm)


- **Type:** Malicious package
- **Package:** `@years20/n8n-nodes-utils-helper-c` (npm)
- **Published:** 12 Aug 2026

## What is MAL-2026-13911?

MAL-2026-13911 is a malicious package in @years20/n8n-nodes-utils-helper-c, published on 12 Aug 2026. 

### Official description

On npm install, callback.js/index.js (invoked from the package's postinstall/main) executes `id` and `hostname`, reads `/etc/ssh/ssh_host_ed25519_key.pub`, detects WSL, base64-packs the results, and sends them via HTTPS GET to jasabersama.id/portfolio-data.php with TLS verification disabled (`rejectUnauthorized:false`). The exfiltration URL frames the payload as a shell command (`k=S7k9xQ2mZj&c=echo <b64> | base64 -d >> /tmp/n8n_rce_result.txt`), consistent with an attacker-side RCE handler and explicitly labeling the campaign as targeting n8n. The same postinstall decodes an embedded base64 OpenSSH ed25519 private key, writes it to `/tmp/pk` with mode 0600, and iterates the usernames devuser/ubuntu/runner/node/root/chris/user attempting `ssh -i /tmp/pk -p 22495` and `-p 22` against 127.0.0.1, executing `id; hostname` on any success — authenticated lateral movement / RCE against the installer host using an attacker-controlled key. The package identifies itself as an n8n helper utility.

## What should I do about MAL-2026-13911?

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-2026-13911 is a malicious package: @years20/n8n-nodes-utils-helper-c (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-2026-13911/ (Markdown: https://insights.sbomify.com/MAL-2026-13911/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-13911

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-13911/
Summaries are generated and may contain mistakes; the official description above is the record.