# MAL-2026-17437: Malicious code in @bluewin/utils (npm)


- **Type:** Malicious package
- **Package:** `@bluewin/utils` (npm)
- **Published:** 1 Oct 2026

## What is MAL-2026-17437?

MAL-2026-17437 is a malicious package in @bluewin/utils, published on 1 Oct 2026. 

### Official description

@bluewin/utils is a dependency-confusion package: it describes itself as a "PoC package for dependency confusion testing" and claims the `@bluewin` scope, so a build that resolves that scope from the public registry runs its code instead of the intended private package. Its postinstall script runs `node postinstall.js` on npm install, which sends an HTTPS request to `https://5w2cezr3af2i0rvm72x74empvg18pzdo.oastify.com/bluewin/utils`, a Burp Collaborator endpoint, disclosing the installing host's IP address and that it installed the package. It collects no further data, but unreviewed code from an outside publisher has run with the installing user's privileges. The npm account securityresearch1 published it on 2026-10-01.

@bluewin/utils@1.0.0 ships a postinstall lifecycle script that performs an HTTPS GET to a hardcoded Burp Collaborator subdomain at https://5w2cezr3af2i0rvm72x74empvg18pzdo.oastify.com/bluewin/utils on every install. The request path embeds the package coordinate, and the outbound DNS resolution and HTTP hit confirm code execution on the installer's machine and disclose the installer's resolver/egress IP to the operator of the oastify.com subdomain. The @bluewin scope and utility name are consistent with a dependency-confusion probe targeting an internal package namespace: any build system that resolves @bluewin/utils from the public npm registry instead of a private registry will fetch and run this beacon at install time. Although the behavior is a reconnaissance beacon rather than a full payload, it establishes attacker-side confirmation of exploitability and leaks environment metadata without consent.

## What should I do about MAL-2026-17437?

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-2026-17437 is a malicious package: @bluewin/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-2026-17437/ (Markdown: https://insights.sbomify.com/MAL-2026-17437/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-17437

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-17437/
Summaries are generated and may contain mistakes; the official description above is the record.