Apache Tomcat: AJP secret compared in non-constant time

Summary

Observable Timing Discrepancy vulnerability when comparing AJP secret in Apache Tomcat. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.21, from 10.1.0-M1 through 10.1.54, from 9.0.0.M1 through 9.0.117, from 8.5.0 through 8.5.100, from 7.0.0 through 7.0.109. Older unsupported versions may also be affected. Users are recommended to upgrade to version 11.0.22, 10.1.55 or 9.0.118 which fix the issue.

Timeline

1. May 12, 2026, 3:32 PM UTCCVE published
2. May 13, 2026, 5:22 PM UTCCISA SSVC assessment

   Exploitation: none · Automatable: no · Technical impact: partial

3. May 13, 2026, 5:22 PM UTCRecord last updated

Affected versions

• Apache Software Foundation Apache Tomcat

  From 11.0.0-M1 · through 11.0.21; From 10.1.0-M1 · through 10.1.54; From 9.0.0.M1 · through 9.0.117; From 8.5.0 · through 8.5.100; From 7.0.0 · through 7.0.109

• org.apache.tomcat.embed:tomcat-embed-coreMaven

  fixed in 9.0.118

• org.apache.tomcat.embed:tomcat-embed-coreMaven

  From 10.1.0-M1 · fixed in 10.1.55

• org.apache.tomcat.embed:tomcat-embed-coreMaven

  From 11.0.0-M1 · fixed in 11.0.22

• org.apache.tomcat:tomcatMaven

  fixed in 9.0.118

• org.apache.tomcat:tomcatMaven

  From 10.1.0-M1 · fixed in 10.1.55

• org.apache.tomcat:tomcatMaven

  From 11.0.0-M1 · fixed in 11.0.22

• org.apache.tomcat:tomcat-catalinaMaven

  fixed in 9.0.118

• org.apache.tomcat:tomcat-catalinaMaven

  From 10.1.0-M1 · fixed in 10.1.55

• org.apache.tomcat:tomcat-catalinaMaven

  From 11.0.0-M1 · fixed in 11.0.22

References 1