CVE-2026-93446 Apache Software Foundation CVE debrief

Who should care

Defenders and administrators of Apache Tomcat servers, particularly those using TLS 1.3, should assess exposure and upgrade to fixed versions to prevent potential connection failures.

Why it matters

CVE-2026-93446: Apache Tomcat incomplete cleanup vulnerability may cause TLS 1.3 connection failures, requiring defenders to assess exposure and upgrade to fixed versions.

• Potential TLS 1.3 connection failures may require verification and remediation efforts
• Defenders should assess exposure and upgrade to fixed versions to prevent connection failures
• Administrators may need to review and update affected versions to ensure secure connections

Technical summary

The incomplete cleanup vulnerability in Apache Tomcat could cause TLS 1.3 connections to fail intermittently, affecting versions 11.0.0-M21 through 11.0.26, 10.1.25 through 10.1.60, and 9.0.90 through 9.0.122. This issue requires defenders to assess exposure and upgrade to fixed versions to prevent connection failures. The vulnerability has a significant impact on TLS 1.3 connections, and upgrading to versions 11.0.27, 10.1.61, or 9.0.123 is recommended to fix the issue. Additionally, defenders should review and update affected versions to ensure secure connections.

Defensive priority

Upgrade to fixed versions 11.0.27, 10.1.61, or 9.0.123 to prevent TLS 1.3 connection failures

Recommended defensive actions

• Upgrade Apache Tomcat to version 11.0.27, 10.1.61, or 9.0.123
• Review and update affected versions 11.0.0-M21 through 11.0.26, 10.1.25 through 10.1.60, and 9.0.90 through 9.0.122
• Monitor for potential TLS 1.3 connection failures
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed
• Check relevant monitoring, detection, and logs for exposed assets that need extra review

Evidence notes

The CVE record and source item provide details on the incomplete cleanup vulnerability in Apache Tomcat, affecting versions 11.0.0-M21 through 11.0.26, 10.1.25 through 10.1.60, and 9.0.90 through 9.0.122.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.