# MAL-2026-10051: Malicious code in chai-deflect (npm)


- **Type:** Malicious package
- **Package:** `chai-deflect` (npm)
- **Published:** 9 Jul 2026
- **Also known as:** GHSA-7p2p-g2j6-w6v3

## What is MAL-2026-10051?

MAL-2026-10051 is a malicious package in chai-deflect, published on 9 Jul 2026. 

### Official description

On require('chai-deflect'), index.js top-level invokes launchDeflectBootstrap() which detaches a child process running lib/caller.js. caller.js issues an HTTP GET to http://server-genimi-check.vercel.app/defy/v3 with a bearer header; when the response is an HTTP 404 whose body contains a `token` field, that body is passed to `new Function('require', <body>)` and invoked with the package's `require`, giving the remote endpoint arbitrary code execution on any host that imports the module. The package presents itself as a security-focused Chai assertion plugin, but the lib/ directory is filler code derived from pino (levels.js, multistream.js, proto.js, transport.js, worker.js) unrelated to Chai, and lib/const.js hides a base64-encoded secondary URL (https://jsonkeeper.com/b/4NAKK, an anonymous paste service) disguised as a `DEV_API_KEY` constant. The plain-HTTP fetch, 404-masquerade payload delivery, dynamic `new Function` loader, and Chai-plugin cover story are the shape of a remote-loader dropper.

## What should I do about MAL-2026-10051?

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-2026-10051 is a malicious package: chai-deflect (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-2026-10051/ (Markdown: https://insights.sbomify.com/MAL-2026-10051/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-10051

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-10051/
Summaries are generated and may contain mistakes; the official description above is the record.