CVE-2026-86243

HighCVSS 7.5/10Last modified Oct 6, 2026

Description

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.

Metrics

CVSS 3.1 7.5/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weakness enumeration

CWE-126

Affected software

Vendor	Product	Versions
Apache Software Foundation	Apache Tomcat Native	>= 2.0.0, <= 2.0.15; >= 1.3.0, <= 1.3.8

References

https://lists.apache.org/thread/8p4jf02w54m22x0cwpq2x53w3ov8o557Vendor Advisory, Mailing List
http://www.openwall.com/lists/oss-security/2026/09/23/31Mailing List, Third Party Advisory

Timeline

Published: Sep 23, 2026
Last modified: Oct 6, 2026
NVD status: Analyzed

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