# MAL-2026-5288: Malicious code in uisp-connector (npm)


- **Type:** Malicious package
- **Package:** `uisp-connector` (npm)
- **Published:** 6 Jun 2026

## What is MAL-2026-5288?

MAL-2026-5288 is a malicious package in uisp-connector, published on 6 Jun 2026. 

### Official description

package.json declares `preinstall: node index.js || true`, causing index.js to run automatically on `npm install`. index.js issues a DNS resolution and HTTPS GET to a unique subdomain under `oast.online` (an Interactsh out-of-band collection server). The callback reveals the installer's resolver IP, egress IP, and the fact that an internal build system fetched a package matching this name — the canonical dependency-confusion exfiltration signal. The README self-identifies the package as security research, and the version string contains `security-research`, but an installer cannot distinguish authorized research from real exploitation: the network beacon and information disclosure happen identically in both cases, and whoever controls the Interactsh subdomain receives the data.

The OpenSSF Package Analysis project identified 'uisp-connector' @ 99.0.0 (npm) as malicious.

It is considered malicious because:

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

## What should I do about MAL-2026-5288?

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-2026-5288 is a malicious package: uisp-connector (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-2026-5288/ (Markdown: https://insights.sbomify.com/MAL-2026-5288/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-5288

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-5288/
Summaries are generated and may contain mistakes; the official description above is the record.