# MAL-2026-11518: Malicious code in exnesss (npm)


- **Type:** Malicious package
- **Package:** `exnesss` (npm)
- **Published:** 4 Aug 2026

## What is MAL-2026-11518?

MAL-2026-11518 is a malicious package in exnesss, published on 4 Aug 2026. 

### Official description

Package name 'exnesss' typosquats 'exness'. The package.json declares scripts.postinstall: 'node./postinstall.js', and postinstall.js issues an HTTPS GET to a hardcoded Burp Collaborator subdomain (hteimcuxkeb6pacscuexz4d9y04rshg6.oastify.com) on every install. This fires automatically on `npm install`, contacting an out-of-band interaction host that reveals the installer's network/DNS metadata to the operator of that Collaborator instance. The package provides no advertised functionality to the installer beyond the beacon.

The OpenSSF Package Analysis project identified 'exnesss' @ 0.0.1 (npm) as malicious.

It is considered malicious because:

- The package communicates with a domain associated with malicious activity.

## What should I do about MAL-2026-11518?

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-2026-11518 is a malicious package: exnesss (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-2026-11518/ (Markdown: https://insights.sbomify.com/MAL-2026-11518/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-11518

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-11518/
Summaries are generated and may contain mistakes; the official description above is the record.