Apache Tomcat information disclosure

Summary

When serving resources from a network location using the NTFS file system, Apache Tomcat versions 10.0.0-M1 to 10.0.0-M9, 9.0.0.M1 to 9.0.39, 8.5.0 to 8.5.59 and 7.0.0 to 7.0.106 were susceptible to JSP source code disclosure in some configurations. The root cause was the unexpected behaviour of the JRE API File.getCanonicalPath() which in turn was caused by the inconsistent behaviour of the Windows API (FindFirstFileW) in some circumstances.

Timeline

1. Jan 14, 2021, 2:45 PM UTCCVE published
2. Oct 8, 2026, 8:57 PM UTCCISA SSVC assessment

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

3. Oct 8, 2026, 9:03 PM UTCRecord last updated
4. Oct 22, 2026EPSS reached 10%

   FIRST estimates at least a 10% chance of exploitation in the next 30 days

Affected versions

• Apache Software Foundation Apache Tomcat

  From Apache Tomcat 10 · fixed in 10.0.0-M10; From Apache Tomcat 9 · fixed in 9.0.40; From Apache Tomcat 8.5 · fixed in 8.5.60; From Apache Tomcat 7 · fixed in 7.0.106

• tomcatBitnami

  From 7.0.0 · fixed in 7.0.107; From 8.5.0 · fixed in 8.5.60; From 9.0.1 · fixed in 9.0.40

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

  From 10.0.0-M1 · fixed in 10.0.0-M10

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

  From 9.0.0 · fixed in 9.0.40

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

  From 8.5.0 · fixed in 8.5.60

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

  From 7.0.0 · fixed in 7.0.107

References 11