CVE-2026-43513 Details
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.
View at NVD
Exploit prediction scoring system (EPSS) score for CVE-2026-43513
EPSS (Exploit Prediction Scoring System): EPSS predicts the likelihood that a vulnerability will be exploited in the wild. A higher percentage means a greater chance of an exploit occurring. The EPSS model produces a probability score between 0 and 1 (0 and 100%).
0.47 Probability of exploitation activity being observed over the next 30 days (37th percentile)
CVSS score for CVE-2026-43513
CVSS (Common Vulnerability Scoring System): An open framework owned and managed by FIRST.Org, Inc. that assigns a numerical score from 0 to 10 to software vulnerabilities to indicate their severity.
7.5 High
Products affected by CVE-2026-43513
Tomcat 10.1.0
Tomcat 10.1.1
Tomcat 10.1.10
Tomcat 10.1.11
Tomcat 10.1.12
DVE Score by Bitsight AI
DVE scores complement traditional static scoring systems like CVSS with Bitsight AI powered real-time threat intelligence and underground cyber criminal activity so that security teams can reduce alert fatigue and focus on vulnerabilities most likely to be exploited.
Low
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CVE-2026-43513 Global Footprint

Top 10 Identified Countries

Country Observations Percentage
US 34,986 26.73%
CN 29,575 22.60%
IN 6,181 4.72%
DE 5,984 4.57%
KR 5,745 4.39%
SG 3,847 2.94%
BR 3,832 2.93%
JP 3,316 2.53%
FR 2,740 2.09%
HK 2,624 2.00%

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CVE-2026-43513 Industry Footprint

Top 10 Identified Industries

*Service provider organizations (typically Technology and Telecommunications) are disproportionally represented in the results given their upstream ownership of end-user infrastructure. See our FAQs.

Industry* Observations Percentage
Technology 77,975 78.85%
Telecommunications 13,820 13.98%
Education 2,307 2.33%
Government/Politics 1,150 1.16%
Finance 669 0.68%
Business Services 647 0.65%
Manufacturing 403 0.41%
Retail 344 0.35%
Healthcare/Wellness 263 0.27%
Transportation 233 0.24%

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