CVE-2026-43513 Details
Description
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.
A vulnerability exists in the LockOutRealm component of Apache Tomcat, where user names are treated as case-sensitive. This issue affects Apache Tomcat versions 11.0.0-M1 prior to 11.0.21, 10.1.0-M1 prior to 10.1.54, 9.0.0-M1 prior to 9.0.117, 8.5.0 prior to 8.5.100, and 7.0.0 prior to 7.0.109. Older unsupported versions may also be affected. The case sensitivity can reduce the effectiveness of the LockOutRealm in preventing brute force attacks on user passwords, particularly in realms where user names are case-insensitive.
Users should upgrade to Apache Tomcat 11.0.22 or later, 10.1.55 or later, or 9.0.118 or later.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed May 14, 2026References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| http://www.openwall.com/lists/oss-security/2026/05/12/9 | CVE | Mailing ListThird Party Advisory |
| https://lists.apache.org/thread/ytjcgldshj73lcnd1sh95od5hrghwogp | [email protected] | Mailing ListVendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-178 | Improper Handling of Case Sensitivity | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| apache tomcat | >= 7.0.0, <= 7.0.109 >= 8.5.0, <= 8.5.100 >= 9.0.0, < 9.0.118 >= 10.1.0, < 10.1.55 >= 11.0.0, < 11.0.22 |
CPE
Remediation
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Change History
6 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| May 15, 2026 | Initial Analysis | [email protected] |
| May 14, 2026 | CVE Modified | CISA-ADP |
| May 12, 2026 | CVE Modified | CVE |
| May 12, 2026 | New CVE Received | [email protected] |