CVE-2026-86243

7.5 HIGH 0.6% exploit odds Fix listed Denial of service Server

What it is

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.

At a glance

Exploitability: Can be exploited over the network without logging in. High risk of service disruption.
Exploit odds: 0.6% chance of exploitation in the next 30 days (EPSS).
Fix: A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

2026-09-23 13:17 UTC PublishedDisclosed publicly on CVE.org and NVD
2026-10-06 13:53 UTC Last updatedMost recent change to the record

Details

Published: 2026-09-23 13:17 UTC
Last modified: 2026-10-06 13:53 UTC
Exploit probability: 0.6% · EPSS, next 30 days
Weakness: CWE-126
Record status: Analyzed

Affected

Apache Tomcat Native < 1.3.9
Apache Tomcat Native < 2.0.16

Attack profile CVSS 3.1 · 7.5

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None
Scope: Unchanged
Confidentiality: None
Integrity: None
Availability: High

Raw vector

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

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Fix and advisories

https://lists.apache.org/thread/8p4jf02w54m22x0cwpq2x53w3ov8o557

References

NVD record · CVE.org record