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CVE-2026-43513 Apache Tomcat

Affected softwareApache Tomcat
Severity7.5 High CVSS 3.1
Fixed in9.0.118, 10.1.55, 11.0.22
WeaknessCWE-178
Published12 May 2026
Updated26 Oct 2026

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.

Exploitation status

No public exploit

No exploit has been reported in the sources we check.

  • CISA KEV not listed
  • VulnCheck KEV not listed
  • CISA Vulnrichment exploitation: none
  • Indexed PoC none indexed
  • EPSS 0.50% chance in 30 days

Waratek protection

No exploit published

Within Waratek scope. In the sources we check, nobody has published exploit code for this CVE or reported it being exploited.

A public code fix exists: apache/tomcat 4a90d3f.

  • Protection none
  • Action unverified
  • Review automated Upstream data
  • Record active
Decided by Exploit code for this candidate, published in a reviewed catalogue or a GitHub repository with 5 or more stars, or in use per CISA or VulnCheck; not only a CISA verdict, a forecast, or nothing at all
Finding This CVE is not listed in CISA KEV or VulnCheck KEV, CISA Vulnrichment records no active exploitation, no reviewed exploit catalogue carries an entry for it, and no GitHub PoC repository for it has 5 or more stars. Nobody has published exploit code worth tracing, so it is not a candidate for a rule ahead of the ones where somebody has; an upstream fix path does exist, so the remediation half of the candidacy still holds. This is a statement about what has been published, not about whether the defect is reachable or serious.

Affected software and releases

Oracle advisories

AdvisoryTypeQuarterProducts Oracle names in its risk matrix
Oracle Critical Patch Update October 2026 ↗ CPU 2026-Q4 Oracle Communications / Microservices (Apache Tomcat) (7.0.0)
Oracle Siebel CRM / Application Interface (Apache Tomcat) (17.0-26.9)

Oracle components and versions

FamilyComponentVersions, as Oracle lists themRead as
Oracle Communications Microservices (Apache Tomcat) 7.0.0 7.0.0
Oracle Siebel CRM Application Interface (Apache Tomcat) 17.0-26.9

Maven packages

Affected and fixed versions, from OSV.dev
PackageIntroducedFixedLast affected
org.apache.tomcat.embed:tomcat-embed-core 0 9.0.118 unbounded
org.apache.tomcat.embed:tomcat-embed-core 10.1.0-M1 10.1.55 unbounded
org.apache.tomcat.embed:tomcat-embed-core 11.0.0-M1 11.0.22 unbounded
org.apache.tomcat:tomcat 0 9.0.118 unbounded
org.apache.tomcat:tomcat 10.1.0-M1 10.1.55 unbounded
org.apache.tomcat:tomcat 11.0.0-M1 11.0.22 unbounded
org.apache.tomcat:tomcat-catalina 0 9.0.118 unbounded
org.apache.tomcat:tomcat-catalina 10.1.0-M1 10.1.55 unbounded
org.apache.tomcat:tomcat-catalina 11.0.0-M1 11.0.22 unbounded

Products and versions

4 products, 14 version entries
SourceVendorProductSchemeAffected versions
nvd apache tomcat generic ≥ 7.0.0 and ≤ 7.0.109 · ≥ 8.5.0 and ≤ 8.5.100 · ≥ 9.0.0 and < 9.0.118 · ≥ 10.1.0 and < 10.1.55 · ≥ 11.0.0 and < 11.0.22
osv org.apache.tomcat tomcat generic < 9.0.118 · ≥ 10.1.0 and < 10.1.55 · ≥ 11.0.0 and < 11.0.22
osv org.apache.tomcat tomcat-catalina generic < 9.0.118 · ≥ 10.1.0 and < 10.1.55 · ≥ 11.0.0 and < 11.0.22
osv org.apache.tomcat.embed tomcat-embed-core generic < 9.0.118 · ≥ 10.1.0 and < 10.1.55 · ≥ 11.0.0 and < 11.0.22

References

URLTags
https://github.com/apache/tomcat/commit/4a90d3fa93988c447cd5bb7482f76ff70d7f15c2 WEB
https://github.com/apache/tomcat/commit/6dd75beb55bd42fc5f78e929596b25018cd17717 WEB
https://github.com/apache/tomcat/commit/83f3e51df7b87f5f6e626951c575ded1a512e8ef WEB
https://github.com/apache/tomcat PACKAGE
https://lists.apache.org/thread/ytjcgldshj73lcnd1sh95od5hrghwogp WEB
https://tomcat.apache.org/security-10.html WEB
https://tomcat.apache.org/security-11.html WEB
https://tomcat.apache.org/security-9.html WEB
http://www.openwall.com/lists/oss-security/2026/05/12/9 WEB

Timeline

Published2026-05-12By the CVE Program.
NVD record modified2026-10-26NVD's own last-modified date for this record.