{"id":"CVE-2026-43513","summary":"Apache Tomcat: LockOutRealm treats user names as case-sensitive","details":"Improper Handling of Case Sensitivity vulnerability in LockOutRealm in Apache Tomcat.\n\nThis 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.\nOlder unsupported versions may also be affected.\n\nUsers are recommended to upgrade to version 11.0.22, 10.1.55 or 9.0.118 which fix the issue.","aliases":["BIT-tomcat-2026-43513","GHSA-5mp6-jrq3-r938"],"modified":"2026-07-08T08:09:36.336602393Z","published":"2026-05-12T15:26:25.599Z","related":["CGA-v62c-9pg8-2fcp","SUSE-SU-2026:22195-1","SUSE-SU-2026:22196-1","SUSE-SU-2026:22197-1","SUSE-SU-2026:2299-1","SUSE-SU-2026:2374-1","SUSE-SU-2026:2377-1","SUSE-SU-2026:2675-1","openSUSE-SU-2026:10925-1","openSUSE-SU-2026:10926-1","openSUSE-SU-2026:10927-1","openSUSE-SU-2026:21117-1","openSUSE-SU-2026:21121-1","openSUSE-SU-2026:21122-1"],"database_specific":{"cwe_ids":["CWE-178"],"cna_assigner":"apache","unresolved_ranges":[{"source":"AFFECTED_FIELD","extracted_events":[{"introduced":"11.0.0-M1"},{"last_affected":"11.0.21"},{"introduced":"10.1.0-M1"},{"last_affected":"10.1.54"},{"introduced":"9.0.0.M1"},{"last_affected":"9.0.117"},{"introduced":"8.5.0"},{"last_affected":"8.5.100"},{"introduced":"7.0.0"},{"last_affected":"7.0.109"}]},{"source":"DESCRIPTION","extracted_events":[{"introduced":"11.0.0-M1"},{"fixed":"11.0.21"},{"introduced":"10.1.0-M1"},{"fixed":"10.1.54"},{"introduced":"9.0.0.M1"},{"fixed":"9.0.117"},{"introduced":"8.5.0"},{"fixed":"8.5.100"},{"introduced":"7.0.0"},{"fixed":"7.0.109"}]}],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43513.json"},"references":[{"type":"WEB","url":"http://www.openwall.com/lists/oss-security/2026/05/12/9"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43513.json"},{"type":"ADVISORY","url":"https://lists.apache.org/thread/ytjcgldshj73lcnd1sh95od5hrghwogp"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-43513"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/apache/tomcat","events":[{"introduced":"e498667bd7811e846771a852b16ce9f1e524b81b"},{"introduced":"e37b977db6f47e4380ad67114a49e8568951c953"},{"introduced":"16bf392c67833ad549733b58c350ff92b5ee782a"},{"fixed":"b4aab5184c1cf1acc0e845e0fd7306dee578e16b"},{"introduced":"e9d17cddc285615807ec5fef09240777436b25dc"},{"fixed":"c70966726754f8b3ab63b5ac846a7e7cf6eb255a"},{"introduced":"56e547d387ab49f688c93fe9ca082b1b5d94deed"},{"fixed":"ccdf7a8c736bde0f4875a10667b21cddbd4be21f"}],"database_specific":{"cpe":"cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:*","source":"CPE_RANGE","extracted_events":[{"introduced":"7.0.0"},{"last_affected":"7.0.109"},{"introduced":"8.5.0"},{"last_affected":"8.5.100"},{"introduced":"9.0.0"},{"fixed":"9.0.118"},{"introduced":"10.1.0"},{"fixed":"10.1.55"},{"introduced":"11.0.0"},{"fixed":"11.0.22"}]}}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-43513.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"}]}