Buffer Over-read Vulnerability in Apache Tomcat Native Software
CVE-2026-86243

7.5HIGH

Key Information:

Vendor

Apache
Status
Apache Tomcat Native
Vendor
CVE Published:
23 September 2026

What is CVE-2026-86243?

A buffer over-read vulnerability exists in Apache Tomcat Native during the TLS handshake. This flaw allows hostile entities to exploit the system, potentially leading to a denial of service (DoS) through a Java Virtual Machine (JVM) crash. The affected versions range from 2.0.0 to 2.0.15 and 1.3.0 to 1.3.8, with earlier unsupported versions likely impacted as well. It is imperative for users to upgrade to version 1.3.9 or 2.0.16 where this issue is resolved.

Affected Version(s)

Apache Tomcat Native 2.0.0 <= 2.0.15

Apache Tomcat Native 1.3.0 <= 1.3.8

References

https://lists.apache.org/thread/8p4jf02w54m22x0cwpq2x53w3...
vendor-advisory

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.