Malicious Package in yeoman-genrator

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

9.8 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS

No dated EPSS signal available.

As published by the source; long descriptions are shortened.

Version 2.0.2 of yoeman-generator contains malicious code as a preinstall script. The package is malware designed to take advantage of users making a mistake when typing the name of a module to install. When installed, the package downloads a file from a remote server, executes it and opens a backdoor. Recommendation 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.

Published by the source

3 Sep 2020, 21:06 UTC

Last modified by the source

9 Jan 2023, 05:03 UTC

Source last checked

26 Oct 2026, 12:08 UTC

1. Revision 2 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-f7g4-fm4c-54m9

2. Revision 1 · created · 24 Oct 2026

   Published from osv record GHSA-f7g4-fm4c-54m9

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# Patch Next advisory brief: GHSA-f7g4-fm4c-54m9

Advisory: Malicious Package in yeoman-genrator
IDs: GHSA-f7g4-fm4c-54m9
Record: https://patchnext.com/advisories/ghsa-f7g4-fm4c-54m9 (revision 2, source checked 26 Oct 2026, 12:08 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Critical (CVSS 9.8)
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 yeoman-genrator: affected every version

## Suggested inspection (read-only)
- `npm ls yeoman-genrator --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 yeoman-genrator.
- 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/GHSA-f7g4-fm4c-54m9 (OSV record GHSA-f7g4-fm4c-54m9 lists affected ranges: npm yeoman-genrator >=0.0.0)
- Verified: https://github.com/advisories/GHSA-f7g4-fm4c-54m9 (GitHub-reviewed advisory GHSA-f7g4-fm4c-54m9 lists affected ranges: npm yeoman-genrator >=0.0.0)

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