CVE-2026-43513

⚠️ high

Summary

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.

CVSS Score

7.5

High

EPSS Score

0.1

Exploit Probability

Published Date

2026-05-12

First Seen: 2026-05-17

📊 Relative Risk Intelligence

This CVE is Moderate Risk - more severe than 69.0% of all 328,009 vulnerabilities in our database.

#101,817

Above average severity

Severity Percentile

🎯 CISA SSVC Assessment Updated: May 14, 2026

🔍 Exploitation Status

None

No known exploits

⚙️ Automatable

YES

Can be exploited automatically

💥 Technical Impact

Partial

Limited system impact

SSVC data provided by CISA

Last Modified 2026-05-15

Source NVD 🔗

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

CWE IDs (Weakness Types)

CWE-178

📦 Affected Products 5

Vendor	Product	Status	Affected Versions
apache	tomcat	Affected	> 10.1.0 < 10.1.55
apache	tomcat	Affected	> 11.0.0 < 11.0.22
apache	tomcat	Affected	> 7.0.0 < 7.0.109
apache	tomcat	Affected	> 8.5.0 < 8.5.100
apache	tomcat	Affected	> 9.0.0 < 9.0.118

🔗 References 2

https://lists.apache.org/thread/ytjcgldshj73lcnd1sh9...

Mailing List Vendor Advisory

http://www.openwall.com/lists/oss-security/2026/05/12/9

Mailing List Third Party Advisory

🔗 Related CVEs 6

CVE ID	Severity	CVSS	EPSS	Summary	Published
CVE-2026-41284	⚠️ high	7.5	0.1	Allocation of Resources Without Limits or Throttling vulnerability in Apache Tomcat. This issue affects Apache Tomcat: ...	2026-05-12
CVE-2026-41293	⛔ critical	9.8	0.2	Improper Input Validation vulnerability in Apache Tomcat. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0...	2026-05-12
CVE-2026-42498	⚠️ high	7.3	0.1	Exposure of HTTP Authentication Header to unexpected hosts during WebSocket authentication vulnerability in Apache Tomca...	2026-05-12
CVE-2026-43512	⛔ critical	9.8	0.1	DEPRECATED: Authentication Bypass Issues vulnerability in digest authentication in Apache Tomcat. This issue affects Ap...	2026-05-12
CVE-2026-43514	ℹ️ low	3.7	0.1	Observable Timing Discrepancy vulnerability when comparing AJP secret in Apache Tomcat. This issue affects Apache Tomc...	2026-05-12
CVE-2026-43515	⛔ critical	9.1	0.1	Improper Authorization vulnerability when multiple method constraints define an HTTP method for the same extension in Ap...	2026-05-12

These CVEs affect the same products