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Malicious code in calculator-preinstall-hook-demo (npm)

GHSA-c6pj-8fr8-qq3c

What to do

Vendor response not established. Follow the primary source's mitigation guidance and check back for a fix.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

  • npm calculator-preinstall-hook-demo

    Affected
    every version
    Fixed in
    no fixed version recorded

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
not scored
EPSS
No dated EPSS signal available.
Source description

As published by the source; long descriptions are shortened.

calculator-preinstall-hook-demo@1.1.2 presents itself as a test fixture for npm lifecycle hooks. Its preinstall script runs `node preinstall.js` on npm install, which POSTs the machine's hostname and the OS username to the Discord webhook `https://discord.com/api/webhooks/1566215853794394162/xsqpEbSn-cc3DU2AKWdzqWnXX5hjTfV-gUePQZ4evrHGlZctMd40TKCrN42qnJd7moc1`. It was published by the npm account bigdevin55 together with calculator-preinstall-chain-demo@1.1.2, which pulls it in as a dependency. --- _-= Per source details. Do not edit below this line.=-_

Source: ghsa-malware (db06ea25b6b764475357882b39d46919c5c083785f24d7ab2a264085acb01d81) 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…

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 1 · created ·

    Published from osv record MAL-2026-18454

Agent brief

Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.

# Patch Next advisory brief: GHSA-c6pj-8fr8-qq3c

Advisory: Malicious code in calculator-preinstall-hook-demo (npm)
IDs: GHSA-c6pj-8fr8-qq3c
Record: https://patchnext.com/advisories/mal-2026-18454 (revision 1, source checked 3 Nov 2026, 06:00 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Unrated
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor response not established. A vendor fix does not mean a deployment is fixed.

## Affected components
- npm calculator-preinstall-hook-demo: affected every version

## Suggested inspection (read-only)
- `npm ls calculator-preinstall-hook-demo --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.

## Supported action
No complete vendor fix is recorded. Follow the primary source's mitigation guidance and check this record again before closing anything.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on calculator-preinstall-hook-demo.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/MAL-2026-18454 (OSV record MAL-2026-18454 lists affected ranges: npm calculator-preinstall-hook-demo >=0)

Commands are suggestions: review each one before running it.

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