Am I affected by Malicious code in nebula-llm (npm)? What should I do?

Question

The npm package nebula-llm@1.0.0 ships a preinstall lifecycle script (preinstall.cjs) that embeds a ~257KB Windows PE binary as a base64+zlib-compressed string literal.

Affected: nebula-llm 1.0.0. Fixed in: no fix reported yet. What should you check, and what should you do about it?

Full incident page with sources: https://agentarmorhq.com/incidents/2026/09/mal-2026-17227-nebula-llm

AgentArmor team · Accepted Answer

**Am I affected?**
Affected: nebula-llm 1.0.0. Fixed in: no fix reported yet.
- Check your version: run `npm ls nebula-llm`. Versions 1.0.0 of nebula-llm are affected.

**What to do now**
1. Remove the package if it is installed: run `npm uninstall nebula-llm`.
2. No fix is available yet.

General practice, not from the source: if the affected software could read tokens or credentials, rotate them after upgrading; pin versions and review changes before updating tools your agents run.

**Sources**
- OSV (Open Source Vulnerabilities): https://osv.dev/MAL-2026-17227

Full incident page: https://agentarmorhq.com/incidents/2026/09/mal-2026-17227-nebula-llm

Am I affected by Malicious code in nebula-llm (npm)? What should I do?

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