CVE-2026-86248
Published:September 23, 2026
Updated:October 10, 2026
CLIENT_CERT authentication does not fail as expected for some scenarios when soft fail is disabled vulnerability in Apache Tomcat.
This issue affects Apache Tomcat: from 11.0.0-M14 through 11.0.25, from 10.1.22 through 10.1.59, from 9.0.92 through 9.0.121.
Users are recommended to upgrade to version 11.0.26, 10.1.60 or 9.0.122, which fix the issue.
Affected Packages
https://github.com/apache/tomcat.git (GITHUB):
Affected version(s) >=10.1.22 <10.1.60Fix Suggestion:
Update to version 10.1.60https://github.com/apache/tomcat.git (GITHUB):
Affected version(s) >=9.0.92 <9.0.122Fix Suggestion:
Update to version 9.0.122https://github.com/apache/tomcat.git (GITHUB):
Affected version(s) >=11.0.0-M14 <11.0.26Fix Suggestion:
Update to version 11.0.26org.apache.tomcat:tomcat-coyote-ffm (JAVA):
Affected version(s) >=11.0.0-M22 <11.0.26Fix Suggestion:
Update to version 11.0.26org.apache.tomcat:tomcat-coyote-ffm (JAVA):
Affected version(s) >=9.0.93 <9.0.122Fix Suggestion:
Update to version 9.0.122org.apache.tomcat:tomcat-coyote-ffm (JAVA):
Affected version(s) >=10.1.26 <10.1.60Fix Suggestion:
Update to version 10.1.60Related Resources (2)
Do you need more information?
Contact UsCVSS v4
Base Score:
9.3
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
HIGH
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
9.8
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Weakness Type (CWE)
Improper Authentication
EPSS
Base Score:
0.39