v4.22.1

Kieirra/murmurev4.22.1Dec 1, 2025by jonchurch

AI Summary

This is the 4.x equivalent of the v5.2.1 hotfix, completely reverting a breaking change introduced in v4.22.0 concerning the extended query parser.

Key Highlights

  • Reverts erroneous breaking change from v4.22.0 related to the extended query parser
  • CVE-2024-51999 has been rejected; no actual security vulnerability exists
  • Fully reverts the change in this release

Full Release Notes

## What's Changed

> [!IMPORTANT]  
> The prior release (4.22.0) included an erroneous breaking change related to the extended query parser. There is no actual security vulnerability associated with this behavior (CVE-2024-51999 has been rejected). The change has been fully reverted in this release.

* Release: 4.22.1 by @UlisesGascon in https://github.com/expressjs/express/pull/6934


**Full Changelog**: https://github.com/expressjs/express/compare/4.22.0...v4.22.1