Vulnerability DatabaseCVE-2026-43513
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CVE-2026-43513
Published:May 12, 2026
Updated:May 14, 2026
Improper Handling of Case Sensitivity vulnerability in LockOutRealm in Apache Tomcat. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.21, from 10.1.0-M1 through 10.1.54, from 9.0.0.M1 through 9.0.117, from 8.5.0 through 8.5.100, from 7.0.0 through 7.0.109. Older unsupported versions may also be affected. Users are recommended to upgrade to version 11.0.22, 10.1.55 or 9.0.118 which fix the issue.
Affected Packages
https://github.com/apache/tomcat.git (GITHUB):
Affected version(s) >=10.1.0-M1 <10.1.55
Fix Suggestion:
Update to version 10.1.55
https://github.com/apache/tomcat.git (GITHUB):
Affected version(s) >=9.0.0-M1 <9.0.118
Fix Suggestion:
Update to version 9.0.118
https://github.com/apache/tomcat.git (GITHUB):
Affected version(s) >=11.0.0-M1 <11.0.22
Fix Suggestion:
Update to version 11.0.22
org.apache.tomcat.embed:tomcat-embed-core (JAVA):
Affected version(s) >=9.0.0.M1 <9.0.118
Fix Suggestion:
Update to version 9.0.118
org.apache.tomcat:tomcat-catalina (JAVA):
Affected version(s) >=10.1.0-M1 <10.1.55
Fix Suggestion:
Update to version 10.1.55
org.apache.tomcat.embed:tomcat-embed-core (JAVA):
Affected version(s) >=11.0.0-M1 <11.0.22
Fix Suggestion:
Update to version 11.0.22
org.apache.tomcat.embed:tomcat-embed-core (JAVA):
Affected version(s) >=10.1.0-M1 <10.1.55
Fix Suggestion:
Update to version 10.1.55
org.apache.tomcat:tomcat-catalina (JAVA):
Affected version(s) >=9.0.0.M1 <9.0.118
Fix Suggestion:
Update to version 9.0.118
org.apache.tomcat:tomcat-catalina (JAVA):
Affected version(s) >=11.0.0-M1 <11.0.22
Fix Suggestion:
Update to version 11.0.22
Related Resources (2)
http://www.openwall.com/lists/oss-security/2026/05/12/9
https://lists.apache.org/thread/ytjcgldshj73lcnd1sh95od5hrghwogp
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CVSS v4
Base Score:
6.9
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
LOW
Vulnerable System Integrity
NONE
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
5.3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
NONE
Availability
NONE
Weakness Type (CWE)
Improper Handling of Case Sensitivity
CWE-178
EPSS
Base Score:
0.02