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CVE-2026-43513

Apache Tomcat: LockOutRealm treats user names as case-sensitive

Published: May 12, 2026Updated: May 15, 2026 Sources: CVE List NVDCWE-178
NVD MITRE
7.5CVSSHIGH
EPSS Score
0.5%
Top 63.2%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:HI:NA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:NIntegrity
None
A:NAvailability
None
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Weaknesses

CWE-178

Affected Products

tomcatapache
On-premWeb App
Networking Infrastructure / load-balancer-proxy
Apache TomcatApache Software Foundation
On-premWeb App
Networking Infrastructure / load-balancer-proxy
apacheoss-projectUSWeb & CMS Pluginsaka apache http server, apache httpd
apache software foundationoss-projectUSWeb & CMS Pluginsaka apache foundation

Exploitability

Official Patch Available

References

https://lists.apache.org/thread/ytjcgldshj73lcnd1sh95od5hrghwogp
lists.apache.org
http://www.openwall.com/lists/oss-security/2026/05/12/9
openwall.com

Timeline

Published
May 12, 2026
Last Updated
May 15, 2026

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