Malicious code in nebula-llm (npm)
- Product
- npm
- Affected
- nebula-llm 1.0.0
- Fixed in
- No fix yet
Last verified against sources: October 26, 2026
Am I affected?
npm: affected nebula-llm 1.0.0. No fix has been reported yet.
- Check your version: run
npm ls nebula-llm. Versions = 1.0.0 of nebula-llm are affected. [1]
What to do now
- Remove the package if it is installed: run
npm uninstall nebula-llm. [1] - No fixed version is available yet, so there is no upgrade to make. [1]
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.
What happened
- The npm package nebula-llm version 1.0.0 contains malicious code. [1]
- It ships a preinstall script, which is a small program that runs by itself when the package is installed. [1]
- On Windows, that script writes a hidden program into the user's local app data folder and starts it in the background. [1]
- The program is named conhost.exe, so it looks like the real Windows Console Host file. [1]
Impact
- Installing the package runs a program from the package author on the user's computer, with no user action and for no stated package purpose. [1]
- The program keeps running after the install finishes. [1]
- The source describes the program as consistent with a persistent remote-access implant, meaning an attacker could keep access to the machine. [1]
What was done
Sources
- GHSA-5ph8-m4r7-g739 — GitHub Advisory Database
Every statement above was checked against these sources before publishing. Spotted an error? Tell us and we will correct it with a dated note.
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Malicious code in nebula-llm (npm)
Product: npm | Affected: nebula-llm 1.0.0 | Fixed in: No fix yet
Summary: The npm package nebula-llm version 1.0.0 contains malicious code.
Source & remediation on AgentArmorHQ: https://agentarmorhq.com/incidents/2026/09/ghsa-5ph8-m4r7-g739-npmCorrections
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