{
"id": "GHSA-5mp6-jrq3-r938",
"aliases": [
"CVE-2026-43513"
],
"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.",
"summary": "Apache Tomcat: LockOutRealm treats user names as case-sensitive",
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "9.0.118"
}
]
}
],
"package": {
"name": "org.apache.tomcat.embed:tomcat-embed-core",
"ecosystem": "Maven"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "10.1.0-M1"
},
{
"fixed": "10.1.55"
}
]
}
],
"package": {
"name": "org.apache.tomcat.embed:tomcat-embed-core",
"ecosystem": "Maven"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "11.0.0-M1"
},
{
"fixed": "11.0.22"
}
]
}
],
"package": {
"name": "org.apache.tomcat.embed:tomcat-embed-core",
"ecosystem": "Maven"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "9.0.118"
}
]
}
],
"package": {
"name": "org.apache.tomcat:tomcat",
"ecosystem": "Maven"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "10.1.0-M1"
},
{
"fixed": "10.1.55"
}
]
}
],
"package": {
"name": "org.apache.tomcat:tomcat",
"ecosystem": "Maven"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "11.0.0-M1"
},
{
"fixed": "11.0.22"
}
]
}
],
"package": {
"name": "org.apache.tomcat:tomcat",
"ecosystem": "Maven"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "9.0.118"
}
]
}
],
"package": {
"name": "org.apache.tomcat:tomcat-catalina",
"ecosystem": "Maven"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "10.1.0-M1"
},
{
"fixed": "10.1.55"
}
]
}
],
"package": {
"name": "org.apache.tomcat:tomcat-catalina",
"ecosystem": "Maven"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "11.0.0-M1"
},
{
"fixed": "11.0.22"
}
]
}
],
"package": {
"name": "org.apache.tomcat:tomcat-catalina",
"ecosystem": "Maven"
}
}
],
"modified": "2026-05-18T20:31:54Z",
"severity": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"
}
],
"published": "2026-05-12T18:30:38Z",
"references": [
{
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-43513",
"type": "ADVISORY"
},
{
"url": "https://github.com/apache/tomcat/commit/4a90d3fa93988c447cd5bb7482f76ff70d7f15c2",
"type": "WEB"
},
{
"url": "https://github.com/apache/tomcat/commit/6dd75beb55bd42fc5f78e929596b25018cd17717",
"type": "WEB"
},
{
"url": "https://github.com/apache/tomcat/commit/83f3e51df7b87f5f6e626951c575ded1a512e8ef",
"type": "WEB"
},
{
"url": "https://github.com/apache/tomcat",
"type": "PACKAGE"
},
{
"url": "https://lists.apache.org/thread/ytjcgldshj73lcnd1sh95od5hrghwogp",
"type": "WEB"
},
{
"url": "https://tomcat.apache.org/security-10.html",
"type": "WEB"
},
{
"url": "https://tomcat.apache.org/security-11.html",
"type": "WEB"
},
{
"url": "https://tomcat.apache.org/security-9.html",
"type": "WEB"
},
{
"url": "http://www.openwall.com/lists/oss-security/2026/05/12/9",
"type": "WEB"
}
],
"schema_version": "1.4.0",
"database_specific": {
"cwe_ids": [
"CWE-178"
],
"severity": "HIGH",
"github_reviewed": true,
"nvd_published_at": "2026-05-12T16:16:18Z",
"github_reviewed_at": "2026-05-18T20:31:54Z"
}
}