# MAL-2026-17808: Malicious code in @s4yhiitestpoc/r2-https-b (npm)


- **Type:** Malicious package
- **Package:** `@s4yhiitestpoc/r2-https-b` (npm)
- **Published:** 12 Oct 2026
- **Also known as:** GHSA-h99w-8693-g33v

## What is MAL-2026-17808?

MAL-2026-17808 is a malicious package in @s4yhiitestpoc/r2-https-b, published on 12 Oct 2026. 

### Official description

On npm install, postinstall.js automatically collects installer-side identifying data — hostname, username, home directory, non-internal network interface addresses, DNS servers, current working directory, install directory, and the value of npm_config_registry (which discloses the installer's internal/private npm registry URL) — and POSTs it as JSON over HTTPS to the hardcoded author endpoint collector.oob.s4yhii.com at path /_npm-poc/beacon. In parallel, the script performs a DNS lookup against a unique per-run subdomain under oob.s4yhii.com (dns.lookup of <label>.db03o8lag74hsugsg2j091t8mfcf437h3.oob.s4yhii.com), providing an out-of-band DNS confirmation channel that works even when outbound HTTPS is blocked. The dual-channel beacon, the capture of internal registry configuration, and the fully automated install-time trigger match the fingerprint of a dependency-confusion probe. The package's self-description as a proof-of-concept does not change the behavior: installer-side host and internal-infrastructure data leaves the host to an attacker-controlled destination without opt-in.

Any computer that has this package installed or running should be considered fully compromised. All secrets and keys stored on that computer should be rotated immediately from a different computer. The package should be removed, but as full control of the computer may have been given to an outside entity, there is no guarantee that removing the package will remove all malicious software resulting from installing it.

## What should I do about MAL-2026-17808?

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-2026-17808 is a malicious package: @s4yhiitestpoc/r2-https-b (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-2026-17808/ (Markdown: https://insights.sbomify.com/MAL-2026-17808/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-17808

---
From sbomify Insights: https://insights.sbomify.com/MAL-2026-17808/
Summaries are generated and may contain mistakes; the official description above is the record.