7.5

CVE-2026-43513: apache software foundation apache tomcat Improper Handling of Case Sensitivity

CVSS: 7.5v3.1HighAnalyzed
AliasesRHSA-2026:44426RHSA-2026:44427UBUNTU-CVE-2026-43513
Published 12-05-2026Last modified 14-05-2026
Open JSON

Vulnerability summary

CVE-2026-43513 is a high (CVSS 7.5) Improper Handling of Case Sensitivity vulnerability in apache software foundation apache tomcat. EPSS estimates a 0.50% chance of exploitation in the next 30 days, higher than 41.6% of scored vulnerabilities.

Overall risk
30/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v3.1 (CVE.org)
EPSS score
0.50%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 25 · Related 15
MGASA-2026-0139OPENSUSE-SU-2026:10925-1OPENSUSE-SU-2026:10926-1OPENSUSE-SU-2026:10927-1OPENSUSE-SU-2026:21117-1OPENSUSE-SU-2026:21121-1

Timeline

  1. 12-05-2026
    PublishedVulnerability first disclosed.
  2. 14-05-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

8 scores · 8 sources · 1 version

EPSS trend

Probability

0.50%

Chance of exploitation in the next 30 days

Percentile

42%

Versus all other CVEs

30-day change

0.00 pp

From 0.50% on 18-09-2026

18-09-202618-10-2026
EPSS score
0.50%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Chainguard22 products
  • camunda-8.8< 8.8.24-r2
  • camunda-8.9< 8.9.5-r2
  • camunda-zeebe-8.6< 8.6.39-r12
  • camunda-zeebe-8.7< 8.7.29-r1
  • camunda-zeebe-8.8< 8.8.24-r1
Redhat20 products
  • tomcat10< 0:10.1.57-3.1.hum1
  • tomcat10-admin-webapps< 0:10.1.57-3.1.hum1
  • tomcat10-common< 0:10.1.57-3.1.hum1
  • tomcat10-docs-webapp< 0:10.1.57-3.1.hum1
  • tomcat10-el-5.0-api< 0:10.1.57-3.1.hum1
Ubuntu6 products
  • tomcat10< 10.1.16-1ubuntu0.1~esm4 | < 10.1.40-1ubuntu1.25.10.1 | < 10.1.40-1ubuntu1.26.04.1
  • tomcat11All versions (No fix recorded)
  • tomcat6< 6.0.39-1ubuntu0.1+esm3
  • tomcat7< 7.0.52-1ubuntu0.16+esm2 | < 7.0.68-1ubuntu0.4+esm4
  • tomcat8All versions (No fix recorded)
Debian3 products
  • tomcat10< 10.1.55-1~deb12u1 | < 10.1.55-1~deb13u1 | < 10.1.55-1
  • tomcat11< 11.0.22-1~deb13u1 | < 11.0.22-1
  • tomcat9< 9.0.70-2
Org.apache.tomcat2 products
  • tomcat< 9.0.118 | ≥ 10.1.0-M1, < 10.1.55 | ≥ 11.0.0-M1, < 11.0.22
  • tomcat-catalina< 9.0.118 | ≥ 10.1.0-M1, < 10.1.55 | ≥ 11.0.0-M1, < 11.0.22
Wolfi2 products
  • thingsboard-tb-mqtt-transport< 4.3.1.2-r0
  • thingsboard-tb-node< 4.3.1.2-r0
Apache1 product
  • tomcat≥ 7.0.0, ≤ 7.0.109 | ≥ 8.5.0, ≤ 8.5.100 | ≥ 9.0.0, < 9.0.118 | ≥ 10.1.0, < 10.1.55 | ≥ 11.0.0, < 11.0.22
Apache software foundation1 product
  • apache tomcat≥ 11.0.0-M1, ≤ 11.0.21 | ≥ 10.1.0-M1, ≤ 10.1.54 | ≥ 9.0.0.M1, ≤ 9.0.117 | ≥ 8.5.0, ≤ 8.5.100 | ≥ 7.0.0, ≤ 7.0.109
Org.apache.tomcat.embed1 product
  • tomcat-embed-core< 9.0.118 | ≥ 10.1.0-M1, < 10.1.55 | ≥ 11.0.0-M1, < 11.0.22

9 vendors · 58 products

References

24 links
Show all 24 references