CVE-2026-86243: CWE-126 Buffer over-read in Apache Software Foundation Apache Tomcat Native
A buffer over-read vulnerability exists in Apache Tomcat Native during the TLS handshake process. This flaw can be exploited by a malicious user to cause a denial of service (DoS) by crashing the Java Virtual Machine (JVM). The vulnerability affects Apache Tomcat Native versions from 2.0.0 through 2.0.15 and from 1.3.0 through 1.3.8. Upgrading to versions 1.3.9 or 2.0.16 resolves the issue.
AI Analysis
Technical Summary
CVE-2026-86243 is a buffer over-read vulnerability (CWE-126) in Apache Tomcat Native that occurs during the TLS handshake. This vulnerability allows an attacker to trigger a JVM crash, resulting in a denial of service condition. The affected versions are Apache Tomcat Native 1.3.0 through 1.3.8 and 2.0.0 through 2.0.15. The issue is fixed in versions 1.3.9 and 2.0.16.
Potential Impact
Exploitation of this vulnerability can cause the Java Virtual Machine to crash, leading to a denial of service. There is no indication of code execution or data disclosure. No known exploits are reported in the wild at this time.
Mitigation Recommendations
Users should upgrade Apache Tomcat Native to version 1.3.9 or 2.0.16 or later to remediate this vulnerability. No other mitigation is indicated by the vendor advisory.
CVE-2026-86243: CWE-126 Buffer over-read in Apache Software Foundation Apache Tomcat Native
Description
A buffer over-read vulnerability exists in Apache Tomcat Native during the TLS handshake process. This flaw can be exploited by a malicious user to cause a denial of service (DoS) by crashing the Java Virtual Machine (JVM). The vulnerability affects Apache Tomcat Native versions from 2.0.0 through 2.0.15 and from 1.3.0 through 1.3.8. Upgrading to versions 1.3.9 or 2.0.16 resolves the issue.
Affected software
Apache Software Foundation
Apache Tomcat Native
pkg:github/apache/tomcat-nativeRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-86243 is a buffer over-read vulnerability (CWE-126) in Apache Tomcat Native that occurs during the TLS handshake. This vulnerability allows an attacker to trigger a JVM crash, resulting in a denial of service condition. The affected versions are Apache Tomcat Native 1.3.0 through 1.3.8 and 2.0.0 through 2.0.15. The issue is fixed in versions 1.3.9 and 2.0.16.
Potential Impact
Exploitation of this vulnerability can cause the Java Virtual Machine to crash, leading to a denial of service. There is no indication of code execution or data disclosure. No known exploits are reported in the wild at this time.
Mitigation Recommendations
Users should upgrade Apache Tomcat Native to version 1.3.9 or 2.0.16 or later to remediate this vulnerability. No other mitigation is indicated by the vendor advisory.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- apache
- Date Reserved
- 2026-09-06T09:21:33.313Z
- State
- PUBLISHED
Threat ID: 6ab3ca9bf7a7c54106c73e0b
Added to database: 09/23/2026, 12:48:27 UTC
Last enriched: 09/23/2026, 13:03:23 UTC
Last updated: 09/23/2026, 13:52:38 UTC
Views: 6
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