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CVE-2026-43513 is an improper case-sensitivity handling vulnerability in Apache Tomcat's LockOutRealm. LockOutRealm treats user names as case-sensitive, which can cause inconsistent account-lockout and authentication behavior when the same account name is presented using different letter casing. Affected versions are Tomcat 11.0.0-M1 through 11.0.21, 10.1.0-M1 through 10.1.54, 9.0.0.M1 through 9.0.117, 8.5.0 through 8.5.100, and 7.0.0 through 7.0.109. Older unsupported releases may also be affected.
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37 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An Apache Tomcat Catalina flaw involving improper case-sensitivity handling in LockOutRealm.
A vulnerability addressed by an Oracle Linux 9 Tomcat package security update. The content does not describe the underlying flaw.
A vulnerability addressed by the Oracle Linux 10 Tomcat 9 security update.
An Apache Tomcat tomcat-catalina vulnerability involving improper handling of case sensitivity in LockOutRealm.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.