CVE-2026-86243

Buffer over-read vulnerability in Apache Tomcat Native during the TLS handshake permits a malicious user to trigger a DoS via a JVM crash. This issue affects Apache Tomcat Native: from 2.0.0 through 2.0.15, from 1.3.0 through 1.3.8. Earlier, unsupported versions may also be affected. Users are recommended to upgrade to version 1.3.9 or 2.0.16, which fix the issue.

Score

CVSS 3.1 7.5 High

Status

Analyzed - security@apache.org

Published

2026-09-23

Last modified

2026-10-06

Weaknesses

CWE-126

Affected products

• Tomcat Native (Apache)
• Apache Tomcat Native (Apache Software Foundation)

References

• https://lists.apache.org/thread/8p4jf02w54m22x0cwpq2x53w3ov8o557
• http://www.openwall.com/lists/oss-security/2026/09/23/31