Is CVE-2026-43513 in the CISA KEV catalog?

No. CVE-2026-43513 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-43513?

CVE-2026-43513 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2026-43513?

CVE-2026-43513 has an EPSS score of 0.47% (38th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-43513?

Upgrade tomcat10 on debian 12 to 10.1.55-1~deb12u1 or later. Fixes are available for 57 affected products.

CVE & CISA-KEV Catalog

CVE-2026-43513

HIGH

7.5

CVSS v3

NVD

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.

CWE-178

How to fix

Remediation Available

tomcat10Debian

Fixed in:10.1.55-1~deb12u1CVE-2026-43513

Fixed in:10.1.55-1~deb13u1CVE-2026-43513

Fixed in:10.1.55-1CVE-2026-43513

jws7-buildRocky

Fixed in:0:1-1.el10jwsRHSA-2026:39188

Fixed in:0:1-1.el8jwsRHSA-2026:39188

Fixed in:0:1-1.el9jwsRHSA-2026:39188

jws7-buildRed Hat / RHEL

Fixed in:0:1-1.el10jwsRHSA-2026:39188

Fixed in:0:1-1.el8jwsRHSA-2026:39188

Fixed in:0:1-1.el9jwsRHSA-2026:39188

jws7-ecjRocky

Fixed in:0:4.38.0-1.redhat_00001.1.el10jwsRHSA-2026:39188

Fixed in:0:4.38.0-1.redhat_00001.1.el8jwsRHSA-2026:39188

Fixed in:0:4.38.0-1.redhat_00001.1.el9jwsRHSA-2026:39188

jws7-ecjRed Hat / RHEL

Fixed in:0:4.38.0-1.redhat_00001.1.el10jwsRHSA-2026:39188

Fixed in:0:4.38.0-1.redhat_00001.1.el8jwsRHSA-2026:39188

Fixed in:0:4.38.0-1.redhat_00001.1.el9jwsRHSA-2026:39188

jws7-javapackages-filesystemRocky

Fixed in:0:6.0.0-1.el10jwsRHSA-2026:39188

Fixed in:0:6.0.0-1.el8jwsRHSA-2026:39188

Fixed in:0:6.0.0-1.el9jwsRHSA-2026:39188

jws7-javapackages-filesystemRed Hat / RHEL

Fixed in:0:6.0.0-1.el10jwsRHSA-2026:39188

Fixed in:0:6.0.0-1.el8jwsRHSA-2026:39188

Fixed in:0:6.0.0-1.el9jwsRHSA-2026:39188

jws7-javapackages-toolsRed Hat / RHEL

Fixed in:0:6.0.0-1.el10jwsRHSA-2026:39188

Fixed in:0:6.0.0-1.el8jwsRHSA-2026:39188

Fixed in:0:6.0.0-1.el9jwsRHSA-2026:39188

jws7-javapackages-toolsRocky

Fixed in:0:6.0.0-1.el10jwsRHSA-2026:39188

Fixed in:0:6.0.0-1.el8jwsRHSA-2026:39188

Fixed in:0:6.0.0-1.el9jwsRHSA-2026:39188

jws7-jboss-loggingRed Hat / RHEL

Fixed in:0:3.6.2-1.Final_redhat_00001.1.el10jwsRHSA-2026:39188

Fixed in:0:3.6.2-1.Final_redhat_00001.1.el8jwsRHSA-2026:39188

Fixed in:0:3.6.2-1.Final_redhat_00001.1.el9jwsRHSA-2026:39188

jws7-jboss-loggingRocky

Fixed in:0:3.6.2-1.Final_redhat_00001.1.el10jwsRHSA-2026:39188

Fixed in:0:3.6.2-1.Final_redhat_00001.1.el8jwsRHSA-2026:39188

Fixed in:0:3.6.2-1.Final_redhat_00001.1.el9jwsRHSA-2026:39188

jws7-mod_clusterRed Hat / RHEL

Fixed in:0:2.1.0-1.Final_redhat_00001.1.el10jwsRHSA-2026:39188

Fixed in:0:2.1.0-1.Final_redhat_00001.1.el8jwsRHSA-2026:39188

Fixed in:0:2.1.0-1.Final_redhat_00001.1.el9jwsRHSA-2026:39188

jws7-mod_clusterRocky

Fixed in:0:2.1.0-1.Final_redhat_00001.1.el10jwsRHSA-2026:39188

Fixed in:0:2.1.0-1.Final_redhat_00001.1.el8jwsRHSA-2026:39188

Fixed in:0:2.1.0-1.Final_redhat_00001.1.el9jwsRHSA-2026:39188

jws7-mod_cluster-tomcatRocky

Fixed in:0:2.1.0-1.Final_redhat_00001.1.el10jwsRHSA-2026:39188

Fixed in:0:2.1.0-1.Final_redhat_00001.1.el8jwsRHSA-2026:39188

Fixed in:0:2.1.0-1.Final_redhat_00001.1.el9jwsRHSA-2026:39188

jws7-mod_cluster-tomcatRed Hat / RHEL

Fixed in:0:2.1.0-1.Final_redhat_00001.1.el10jwsRHSA-2026:39188

Fixed in:0:2.1.0-1.Final_redhat_00001.1.el8jwsRHSA-2026:39188

Fixed in:0:2.1.0-1.Final_redhat_00001.1.el9jwsRHSA-2026:39188

jws7-python3-javapackagesRocky

Fixed in:0:6.0.0-1.el10jwsRHSA-2026:39188

Fixed in:0:6.0.0-1.el8jwsRHSA-2026:39188

Fixed in:0:6.0.0-1.el9jwsRHSA-2026:39188

jws7-python3-javapackagesRed Hat / RHEL

Fixed in:0:6.0.0-1.el10jwsRHSA-2026:39188

Fixed in:0:6.0.0-1.el8jwsRHSA-2026:39188

Fixed in:0:6.0.0-1.el9jwsRHSA-2026:39188

jws7-runtimeRed Hat / RHEL

Fixed in:0:1-1.el10jwsRHSA-2026:39188

Fixed in:0:1-1.el8jwsRHSA-2026:39188

Fixed in:0:1-1.el9jwsRHSA-2026:39188

jws7-runtimeRocky

Fixed in:0:1-1.el10jwsRHSA-2026:39188

Fixed in:0:1-1.el8jwsRHSA-2026:39188

Fixed in:0:1-1.el9jwsRHSA-2026:39188

jws7-tomcatRed Hat / RHEL

Fixed in:0:11.0.21-5.redhat_00004.1.el10jwsRHSA-2026:39188

Fixed in:0:11.0.21-5.redhat_00004.1.el8jwsRHSA-2026:39188

Fixed in:0:11.0.21-5.redhat_00004.1.el9jwsRHSA-2026:39188

jws7-tomcatRocky

Fixed in:0:11.0.21-5.redhat_00004.1.el10jwsRHSA-2026:39188

Fixed in:0:11.0.21-5.redhat_00004.1.el8jwsRHSA-2026:39188

Fixed in:0:11.0.21-5.redhat_00004.1.el9jwsRHSA-2026:39188

jws7-tomcat-admin-webappsRed Hat / RHEL

Fixed in:0:11.0.21-5.redhat_00004.1.el10jwsRHSA-2026:39188

Fixed in:0:11.0.21-5.redhat_00004.1.el8jwsRHSA-2026:39188

Fixed in:0:11.0.21-5.redhat_00004.1.el9jwsRHSA-2026:39188

jws7-tomcat-admin-webappsRocky

Fixed in:0:11.0.21-5.redhat_00004.1.el10jwsRHSA-2026:39188

Fixed in:0:11.0.21-5.redhat_00004.1.el8jwsRHSA-2026:39188

Fixed in:0:11.0.21-5.redhat_00004.1.el9jwsRHSA-2026:39188

jws7-tomcat-docs-webappRed Hat / RHEL

Fixed in:0:11.0.21-5.redhat_00004.1.el10jwsRHSA-2026:39188

Fixed in:0:11.0.21-5.redhat_00004.1.el8jwsRHSA-2026:39188

Fixed in:0:11.0.21-5.redhat_00004.1.el9jwsRHSA-2026:39188

jws7-tomcat-docs-webappRocky

Fixed in:0:11.0.21-5.redhat_00004.1.el10jwsRHSA-2026:39188

Fixed in:0:11.0.21-5.redhat_00004.1.el8jwsRHSA-2026:39188

Fixed in:0:11.0.21-5.redhat_00004.1.el9jwsRHSA-2026:39188

jws7-tomcat-el-5.0-apiRocky

Fixed in:0:11.0.21-5.redhat_00004.1.el10jwsRHSA-2026:39188

Fixed in:0:11.0.21-5.redhat_00004.1.el8jwsRHSA-2026:39188

Fixed in:0:11.0.21-5.redhat_00004.1.el9jwsRHSA-2026:39188

jws7-tomcat-el-5.0-apiRed Hat / RHEL

Fixed in:0:11.0.21-5.redhat_00004.1.el10jwsRHSA-2026:39188

Fixed in:0:11.0.21-5.redhat_00004.1.el8jwsRHSA-2026:39188

Fixed in:0:11.0.21-5.redhat_00004.1.el9jwsRHSA-2026:39188

jws7-tomcat-javadocRed Hat / RHEL

Fixed in:0:11.0.21-5.redhat_00004.1.el10jwsRHSA-2026:39188

Fixed in:0:11.0.21-5.redhat_00004.1.el8jwsRHSA-2026:39188

Fixed in:0:11.0.21-5.redhat_00004.1.el9jwsRHSA-2026:39188

jws7-tomcat-javadocRocky

Fixed in:0:11.0.21-5.redhat_00004.1.el10jwsRHSA-2026:39188

Fixed in:0:11.0.21-5.redhat_00004.1.el8jwsRHSA-2026:39188

Fixed in:0:11.0.21-5.redhat_00004.1.el9jwsRHSA-2026:39188

jws7-tomcat-jsp-3.1-apiRocky

Fixed in:0:11.0.21-5.redhat_00004.1.el10jwsRHSA-2026:39188

Fixed in:0:11.0.21-5.redhat_00004.1.el8jwsRHSA-2026:39188

Fixed in:0:11.0.21-5.redhat_00004.1.el9jwsRHSA-2026:39188

jws7-tomcat-jsp-3.1-apiRed Hat / RHEL

Fixed in:0:11.0.21-5.redhat_00004.1.el10jwsRHSA-2026:39188

Fixed in:0:11.0.21-5.redhat_00004.1.el8jwsRHSA-2026:39188

Fixed in:0:11.0.21-5.redhat_00004.1.el9jwsRHSA-2026:39188

jws7-tomcat-libRocky

Fixed in:0:11.0.21-5.redhat_00004.1.el10jwsRHSA-2026:39188

Fixed in:0:11.0.21-5.redhat_00004.1.el8jwsRHSA-2026:39188

Fixed in:0:11.0.21-5.redhat_00004.1.el9jwsRHSA-2026:39188

jws7-tomcat-libRed Hat / RHEL

Fixed in:0:11.0.21-5.redhat_00004.1.el10jwsRHSA-2026:39188

Fixed in:0:11.0.21-5.redhat_00004.1.el8jwsRHSA-2026:39188

Fixed in:0:11.0.21-5.redhat_00004.1.el9jwsRHSA-2026:39188

jws7-tomcat-nativeRed Hat / RHEL

Fixed in:0:1.3.7-2.redhat_2.el10jwsRHSA-2026:39188

Fixed in:0:1.3.7-2.redhat_2.el8jwsRHSA-2026:39188

Fixed in:0:1.3.7-2.redhat_2.el9jwsRHSA-2026:39188

jws7-tomcat-nativeRocky

Fixed in:0:1.3.7-2.redhat_2.el10jwsRHSA-2026:39188

Fixed in:0:1.3.7-2.redhat_2.el8jwsRHSA-2026:39188

Fixed in:0:1.3.7-2.redhat_2.el9jwsRHSA-2026:39188

jws7-tomcat-native-debuginfoRocky

Fixed in:0:1.3.7-2.redhat_2.el10jwsRHSA-2026:39188

Fixed in:0:1.3.7-2.redhat_2.el8jwsRHSA-2026:39188

Fixed in:0:1.3.7-2.redhat_2.el9jwsRHSA-2026:39188

jws7-tomcat-native-debuginfoRed Hat / RHEL

Fixed in:0:1.3.7-2.redhat_2.el10jwsRHSA-2026:39188

Fixed in:0:1.3.7-2.redhat_2.el8jwsRHSA-2026:39188

Fixed in:0:1.3.7-2.redhat_2.el9jwsRHSA-2026:39188

jws7-tomcat-selinuxRed Hat / RHEL

Fixed in:0:11.0.21-5.redhat_00004.1.el10jwsRHSA-2026:39188

Fixed in:0:11.0.21-5.redhat_00004.1.el8jwsRHSA-2026:39188

Fixed in:0:11.0.21-5.redhat_00004.1.el9jwsRHSA-2026:39188

jws7-tomcat-selinuxRocky

Fixed in:0:11.0.21-5.redhat_00004.1.el10jwsRHSA-2026:39188

Fixed in:0:11.0.21-5.redhat_00004.1.el8jwsRHSA-2026:39188

Fixed in:0:11.0.21-5.redhat_00004.1.el9jwsRHSA-2026:39188

jws7-tomcat-servlet-6.0-apiRed Hat / RHEL

Fixed in:0:11.0.21-5.redhat_00004.1.el10jwsRHSA-2026:39188

Fixed in:0:11.0.21-5.redhat_00004.1.el8jwsRHSA-2026:39188

Fixed in:0:11.0.21-5.redhat_00004.1.el9jwsRHSA-2026:39188

jws7-tomcat-servlet-6.0-apiRocky

Fixed in:0:11.0.21-5.redhat_00004.1.el10jwsRHSA-2026:39188

Fixed in:0:11.0.21-5.redhat_00004.1.el8jwsRHSA-2026:39188

Fixed in:0:11.0.21-5.redhat_00004.1.el9jwsRHSA-2026:39188

jws7-tomcat-vaultRocky

Fixed in:0:1.1.11-4.Final_redhat_00003.1.el10jwsRHSA-2026:39188

Fixed in:0:1.1.11-4.Final_redhat_00003.1.el8jwsRHSA-2026:39188

Fixed in:0:1.1.11-4.Final_redhat_00003.1.el9jwsRHSA-2026:39188

jws7-tomcat-vaultRed Hat / RHEL

Fixed in:0:1.1.11-4.Final_redhat_00003.1.el10jwsRHSA-2026:39188

Fixed in:0:1.1.11-4.Final_redhat_00003.1.el8jwsRHSA-2026:39188

Fixed in:0:1.1.11-4.Final_redhat_00003.1.el9jwsRHSA-2026:39188

jws7-tomcat-vault-javadocRocky

Fixed in:0:1.1.11-4.Final_redhat_00003.1.el10jwsRHSA-2026:39188

Fixed in:0:1.1.11-4.Final_redhat_00003.1.el8jwsRHSA-2026:39188

Fixed in:0:1.1.11-4.Final_redhat_00003.1.el9jwsRHSA-2026:39188

jws7-tomcat-vault-javadocRed Hat / RHEL

Fixed in:0:1.1.11-4.Final_redhat_00003.1.el10jwsRHSA-2026:39188

Fixed in:0:1.1.11-4.Final_redhat_00003.1.el8jwsRHSA-2026:39188

Fixed in:0:1.1.11-4.Final_redhat_00003.1.el9jwsRHSA-2026:39188

jws7-tomcat-webappsRocky

Fixed in:0:11.0.21-5.redhat_00004.1.el10jwsRHSA-2026:39188

Fixed in:0:11.0.21-5.redhat_00004.1.el8jwsRHSA-2026:39188

Fixed in:0:11.0.21-5.redhat_00004.1.el9jwsRHSA-2026:39188

jws7-tomcat-webappsRed Hat / RHEL

Fixed in:0:11.0.21-5.redhat_00004.1.el10jwsRHSA-2026:39188

Fixed in:0:11.0.21-5.redhat_00004.1.el8jwsRHSA-2026:39188

Fixed in:0:11.0.21-5.redhat_00004.1.el9jwsRHSA-2026:39188

libtomcat10-embed-javaUbuntu

Fixed in:10.1.16-1ubuntu0.1~esm4USN-8417-1

Fixed in:10.1.40-1ubuntu1.25.10.1USN-8417-1

libtomcat10-javaUbuntu

Fixed in:10.1.16-1ubuntu0.1~esm4USN-8417-1

Fixed in:10.1.40-1ubuntu1.25.10.1USN-8417-1

libtomcat6-javaUbuntu

Fixed in:6.0.39-1ubuntu0.1+esm3USN-8383-1

libtomcat7-javaUbuntu

Fixed in:7.0.52-1ubuntu0.16+esm2USN-8383-1

Fixed in:7.0.68-1ubuntu0.4+esm4USN-8383-1

libtomcat9-embed-javaUbuntu

Fixed in:9.0.16-3ubuntu0.18.04.2+esm8USN-8417-1

Fixed in:9.0.31-1ubuntu0.9+esm3USN-8417-1

Fixed in:9.0.58-1ubuntu0.2+esm4USN-8417-1

libtomcat9-javaUbuntu

Fixed in:9.0.16-3ubuntu0.18.04.2+esm8USN-8417-1

Fixed in:9.0.31-1ubuntu0.9+esm3USN-8417-1

Fixed in:9.0.58-1ubuntu0.2+esm4USN-8417-1

Fixed in:9.0.70-2ubuntu0.1+esm3USN-8417-1

Fixed in:9.0.95-1ubuntu1.1USN-8417-1

tomcat10Ubuntu

Fixed in:10.1.16-1ubuntu0.1~esm4USN-8417-1

Fixed in:10.1.40-1ubuntu1.25.10.1USN-8417-1

tomcat6Ubuntu

Fixed in:6.0.39-1ubuntu0.1+esm3USN-8383-1

tomcat7Ubuntu

Fixed in:7.0.52-1ubuntu0.16+esm2USN-8383-1

Fixed in:7.0.68-1ubuntu0.4+esm4USN-8383-1

tomcat9Ubuntu

Fixed in:9.0.16-3ubuntu0.18.04.2+esm8USN-8417-1

Fixed in:9.0.31-1ubuntu0.9+esm3USN-8417-1

Fixed in:9.0.58-1ubuntu0.2+esm4USN-8417-1

Fixed in:9.0.70-2ubuntu0.1+esm3USN-8417-1

Fixed in:9.0.95-1ubuntu1.1USN-8417-1

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityNone

AvailabilityNone

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Exploit Intelligence

0.47%probability of exploitation in 30 days

38thpercentile

Low risk: more likely to be exploited than 38% of all known CVEs.

References

Vendor Advisory1

lists.apache.org

Third-Party Advisory1

openwall.com

Related Vulnerabilities

Other CWE-178 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2025-27636	Medium	5.6	80%	-	Fix
CVE-2021-24347	High	8.8	52%	-	Fix
CVE-2020-12812	Critical	9.8	49%	KEV + Ransom	Fix
CVE-2003-0411	High	7.5	25%	-	-
CVE-2018-9845	Critical	9.8	13%	-	Fix
CVE-2001-0766	Critical	9.8	8.2%	-	-

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-05-15.