Out-of-bounds read in Apache Tomcat Native - CVE-2026-86243
Published: September 24, 2026
Vulnerability identifier: #VU151964
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-86243
CWE-ID: CWE-125
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to a buffer over-read in Apache Tomcat Native during TLS handshaking when processing a TLS handshake. A remote attacker can initiate a TLS handshake to cause a denial of service.
Affected software
Apache Tomcat Native
How to mitigate CVE-2026-86243
Install security update from vendor's website.
Apache Tomcat Native - addressed in versions 1.3.9, 2.0.16