CVE-2026-86247
Published:September 23, 2026
Updated:October 13, 2026
Race condition within a thread vulnerability in Apache Tomcat Native allowed client certificate verification requirements to be down-graded for some configurations.
This issue affects Apache Tomcat Native: from 2.0.0 through 2.0.15, from 1.3.0 through 1.3.8. Unsupported versions may also be affected.
Users are recommended to upgrade to version 2.0.16 or 1.3.9, which fixes the issue.
Affected Packages
https://github.com/apache/tomcat-native.git (GITHUB):
Affected version(s) >=2.0.0 <2.0.16Fix Suggestion:
Update to version 2.0.16https://github.com/apache/tomcat-native.git (GITHUB):
Affected version(s) >=1.3.0 <1.3.9Fix Suggestion:
Update to version 1.3.9Related Resources (4)
Do you need more information?
Contact UsCVSS v4
Base Score:
9.1
Attack Vector
NETWORK
Attack Complexity
HIGH
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
HIGH
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
7.4
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
NONE
Weakness Type (CWE)
Race Condition within a Thread
EPSS
Base Score:
0.22