In Spring Framework versions 6.0.15 and 6.1.2, it is possible for a user to provide specially crafted HTTP requests that may cause a denial-of-service (DoS) condition.

Specifically, an application is vulnerable when all of the following are true:

• the application uses Spring MVC
• Spring Security 6.1.6+ or 6.2.1+ is on the classpath

Typically, Spring Boot applications need the org.springframework.boot:spring-boot-starter-web and org.springframework.boot:spring-boot-starter-security dependencies to meet all conditions.

Spring Framework

• 6.0.15
• 6.1.2

Older versions are not affected.

Those versions are respectively being used by Spring Boot 3.1.7 and 3.2.1.

Users of affected versions should apply the following mitigation.

• Spring Framework 6.0.15 users should upgrade to 6.0.16.
• Spring Framework 6.1.2 users should upgrade to 6.1.3.

No other steps are necessary.

The issue was identified and responsibly reported by

• Aleksander Blomskøld
• LiveOverflow (hextree.io), ZetaTwo, anasbekar, zzgoon, 0xLegacyy, xyzeva, AcroTiger