CVE-2026-43513

Name: CVE-2026-43513
Creator: NVD / NIST
Published: 2026-05-12T16:16:18.177+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 0.47%

Last modified Jun 17, 2026

CVE-2026-43513 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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.. EPSS estimates a 0.47% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

0.47%

37.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-178

Affected Software

Vendor	Product	Versions
Apache	Tomcat	>= 7.0.0, <= 7.0.109
Apache	Tomcat	>= 8.5.0, <= 8.5.100
Apache	Tomcat	>= 9.0.0, < 9.0.118
Apache	Tomcat	>= 10.1.0, < 10.1.55
Apache	Tomcat	>= 11.0.0, < 11.0.22

References

https://lists.apache.org/thread/ytjcgldshj73lcnd1sh95od5hrghwogpMailing List, Vendor Advisory
http://www.openwall.com/lists/oss-security/2026/05/12/9Mailing List, Third Party Advisory

Timeline

Published: May 12, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-43513?

How severe is CVE-2026-43513?

CVE-2026-43513 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 0.47% probability of exploitation in the next 30 days.

How do I fix CVE-2026-43513?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-43513?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST