# MAL-2026-5703: Malicious code in eslint-plugin-mistica-local-rules (npm)


- **Type:** Malicious package
- **Package:** `eslint-plugin-mistica-local-rules` (npm)
- **Published:** 12 Jun 2026

## What is MAL-2026-5703?

MAL-2026-5703 is a malicious package in eslint-plugin-mistica-local-rules, published on 12 Jun 2026. 

### Official description

package.json declares a preinstall hook that runs index.js automatically on npm install. index.js collects host identity (os.hostname(), os.platform(), os.arch(), os.userInfo() including uid/gid, shell, homedir, cwd) and the output of `whoami` and `id` via child_process, then POSTs the JSON payload to the hardcoded URL https://eucfugc8bk66haszliir75yd74dv1lpa.oastify.com/detox56 (a Burp Collaborator subdomain). The package ships no eslint rule implementation — its only effect on install is the recon/exfiltration beacon. The package name `eslint-plugin-mistica-local-rules` mimics the Telefónica Mistica design-system internal eslint-plugin namespace, consistent with a dependency-confusion attack against private-registry consumers.

## What should I do about MAL-2026-5703?

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-2026-5703 is a malicious package: eslint-plugin-mistica-local-rules (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-2026-5703/ (Markdown: https://insights.sbomify.com/MAL-2026-5703/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-5703

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-5703/
Summaries are generated and may contain mistakes; the official description above is the record.