DoS Attack via Range Requests

Summary

Spring Framework, version 5.1, versions 5.0.x prior to 5.0.10, versions 4.3.x prior to 4.3.20, and older unsupported versions on the 4.2.x branch provide support for range requests when serving static resources through the ResourceHttpRequestHandler, or starting in 5.0 when an annotated controller returns an org.springframework.core.io.Resource. A malicious user (or attacker) can add a range header with a high number of ranges, or with wide ranges that overlap, or both, for a denial of service attack. This vulnerability affects applications that depend on either spring-webmvc or spring-webflux. Such applications must also have a registration for serving static resources (e.g. JS, CSS, images, and others), or have an annotated controller that returns an org.springframework.core.io.Resource. Spring Boot applications that depend on spring-boot-starter-web or spring-boot-starter-webflux are ready to serve static resources out of the box and are therefore vulnerable.

Timeline

1. Oct 18, 2018, 10:00 PM UTCCVE published
2. Oct 8, 2026, 9:15 PM UTCCISA SSVC assessment

   Exploitation: none · Automatable: yes · Technical impact: partial

3. Oct 8, 2026, 9:24 PM UTCRecord last updated

Affected versions

• Pivotal Spring framework

  From 5.0.0 · through 5.0.9; From 4.3 · through 4.3.19

• org.springframework:spring-coreMaven

  From 5.1.0.RELEASE · fixed in 5.1.1.RELEASE

• org.springframework:spring-coreMaven

  From 5.0.0.RELEASE · fixed in 5.0.10.RELEASE

• org.springframework:spring-coreMaven

  From 4.2.0.RELEASE · fixed in 4.3.20.RELEASE

References 21