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CVE-2026-43513 Apache Tomcat: LockOutRealm treats user names as case-sensitive

🗓️ 12 May 2026 15:26:25Reported by apacheType 
cvelist
 cvelist
🔗 www.cve.org👁 52 Views

Apache Tomcat LockOutRealm case sensitivity flaw affects many versions; upgrade to fixes.

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Affected
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Family
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17 Jun 202615:33
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IBM Security Bulletins
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16 Jun 202617:54
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IBM Security Bulletins
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Tenable Nessus
Amazon Linux 2023 : tomcat9, tomcat9-admin-webapps, tomcat9-el-3.0-api (ALAS2023-2026-1770)
8 Jun 202600:00
nessus
Tenable Nessus
Amazon Linux 2023 : tomcat10, tomcat10-admin-webapps, tomcat10-el-5.0-api (ALAS2023-2026-1776)
8 Jun 202600:00
nessus
Tenable Nessus
Amazon Linux 2 : tomcat, --advisory ALAS2TOMCAT9-2026-026 (ALASTOMCAT9-2026-026)
8 Jun 202600:00
nessus
Tenable Nessus
Debian dla-4619 : libtomcat9-embed-java - security update
6 Jun 202600:00
nessus
Tenable Nessus
Debian dsa-6328 : libtomcat10-embed-java - security update
8 Jun 202600:00
nessus
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[
  {
    "defaultStatus": "unaffected",
    "product": "Apache Tomcat",
    "vendor": "Apache Software Foundation",
    "versions": [
      {
        "lessThanOrEqual": "11.0.21",
        "status": "affected",
        "version": "11.0.0-M1",
        "versionType": "semver"
      },
      {
        "lessThanOrEqual": "10.1.54",
        "status": "affected",
        "version": "10.1.0-M1",
        "versionType": "semver"
      },
      {
        "lessThanOrEqual": "9.0.117",
        "status": "affected",
        "version": "9.0.0.M1",
        "versionType": "semver"
      },
      {
        "lessThanOrEqual": "8.5.100",
        "status": "affected",
        "version": "8.5.0",
        "versionType": "semver"
      },
      {
        "lessThanOrEqual": "7.0.109",
        "status": "affected",
        "version": "7.0.0",
        "versionType": "semver"
      },
      {
        "lessThan": "7.00",
        "status": "unknown",
        "version": "0",
        "versionType": "semver"
      }
    ]
  }
]

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