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 67.7% of all 365,646 vulnerabilities in our database.

#117,948

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-2026-65182	⛔ critical	9.1	0.6	Improper Access Control, Incorrect Authorization vulnerability in Apache Tomcat leads to security constraint bypass if a...	2026-08-25
CVE-2026-65183	⚠️ high	8.1	0.5	Time-of-check Time-of-use (TOCTOU) Race Condition vulnerability in Apache Tomcat when creating unix domain sockets allow...	2026-08-25
CVE-2026-65637	⛔ critical	9.8	0.8	Improper Input Validation vulnerability in Apache Tomcat due to incomplete fix for CVE-2026-32990. This issue affects...	2026-08-25
CVE-2026-65905	⛔ critical	9.8	0.8	Authentication Bypass by Capture-replay vulnerability in Apache Tomcat's DIGEST authenticator. If, before windowSize req...	2026-08-25
CVE-2026-65927	⚠️ high	7.5	0.8	Off-by-one Error vulnerability in Apache Tomcat impacting the [N] flag on the rewrite valves causes rewrite processing t...	2026-08-25
CVE-2026-66422	⚠️ high	8.1	0.6	Improper Authorization vulnerability in Apache Tomcat cause by security-role-ref definitions being incorrectly used as r...	2026-08-25

These CVEs affect the same products