In Spring Framework versions 6.0.0 - 6.0.6, 5.3.0 - 5.3.25, 5.2.0.RELEASE - 5.2.22.RELEASE, and older unsupported versions, it is possible for a user to provide a specially crafted SpEL expression that may cause a denial-of-service (DoS) condition.

• Spring Framework
  • 6.0.0 to 6.0.6
  • 5.3.0 to 5.3.25
  • 5.2.0.RELEASE to 5.2.22.RELEASE
  • Older, unsupported versions are also affected

Users of affected versions should apply the following mitigation: 6.0.x users should upgrade to 6.0.7+. 5.3.x users should upgrade to 5.3.26+. 5.2.x users should upgrade to 5.2.23.RELEASE+. Users of older, unsupported versions should upgrade to 6.0.7+ or 5.3.26+. No other steps are necessary. Releases that have fixed this issue include:

• Spring Framework
  • 6.0.7+
  • 5.3.26+
  • 5.2.23.RELEASE+

This vulnerability was initially discovered and responsibly reported by the Google OSS-Fuzz team from Code Intelligence.