DevTools remote secret comparison is vulnerable to timing attacks

HIGH | APRIL 23, 2026 | CVE-2026-40972

Description

An attacker on the same network as the remote application may be able to utilize a timing attack to discover information about the remote secret. In extreme circumstances this could result in the attacker determining the secret and uploading changed classes, thereby achieving remote code execution in the remote application.

Affected Spring Products and Versions

Spring Boot:

  • 4.0.0 - 4.0.5
  • 3.5.0 - 3.5.13
  • 3.4.0 - 3.4.15
  • 3.3.0 - 3.3.18
  • 2.7.32 and earlier

Mitigation

Users of affected versions should upgrade to the corresponding fixed version.
Fix versionAvailability
4.0.6OSS
3.5.14OSS
3.4.16Enterprise Support Only
3.3.19Enterprise Support Only
2.7.33Enterprise Support Only

No further mitigation steps are necessary.

History

  • 2026-04-23: Initial vulnerability report published.

Get ahead

VMware offers training and certification to turbo-charge your progress.

Learn more

Get support

Tanzu Spring offers support and binaries for OpenJDK™, Spring, and Apache Tomcat® in one simple subscription.

Learn more

Upcoming events

Check out all the upcoming events in the Spring community.

View all