CVE-2026-43515 — Vulnerability in...

CRITICAL

Apache Tomcat - Security constraints not correctly applied

Published May 12, 2026Updated September 11, 2026Source: osv

Summary

Versions Affected: Apache Tomcat 11.0.0-M1 to 11.0.21 Apache Tomcat 10.1.0-M1 to 10.1.54 Apache Tomcat 9.0.0.M1 to 9.0.117 Older, unsupported versions may also be affected Description: When multiple security constraints defined an HTTP method constraint for the same extension pattern, only the first method constraint was applied. Mitigation: Users of the affected versions should apply one of the following mitigations: - Upgrade to Apache Tomcat 11.0.22 or later - Upgrade to Apache Tomcat 10.1.55 or later - Upgrade to Apache Tomcat 9.0.118 or later

Advisory Timeline

First published May 12, 2026 (153 days ago).
Last revised September 11, 2026 — 122 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

Maven

Update org.apache.tomcat.embed:tomcat-embed-core to 11.0.22 or later

<!-- Update pom.xml dependency version to 11.0.22 for org.apache.tomcat.embed:tomcat-embed-core -->

Maven

Update org.apache.tomcat.embed:tomcat-embed-core to 9.0.118 or later

<!-- Update pom.xml dependency version to 9.0.118 for org.apache.tomcat.embed:tomcat-embed-core -->

Maven

Update org.apache.tomcat.embed:tomcat-embed-core to 10.1.55 or later

<!-- Update pom.xml dependency version to 10.1.55 for org.apache.tomcat.embed:tomcat-embed-core -->

Maven

Update org.apache.tomcat:tomcat-catalina to 9.0.118 or later

<!-- Update pom.xml dependency version to 9.0.118 for org.apache.tomcat:tomcat-catalina -->

Maven

Update org.apache.tomcat:tomcat to 11.0.22 or later

<!-- Update pom.xml dependency version to 11.0.22 for org.apache.tomcat:tomcat -->

Maven

Update org.apache.tomcat:tomcat-catalina to 11.0.22 or later

<!-- Update pom.xml dependency version to 11.0.22 for org.apache.tomcat:tomcat-catalina -->

Maven

Update org.apache.tomcat:tomcat to 10.1.55 or later

<!-- Update pom.xml dependency version to 10.1.55 for org.apache.tomcat:tomcat -->

Maven

Update org.apache.tomcat:tomcat to 9.0.118 or later

<!-- Update pom.xml dependency version to 9.0.118 for org.apache.tomcat:tomcat -->

Maven

Update org.apache.tomcat:tomcat-catalina to 10.1.55 or later

<!-- Update pom.xml dependency version to 10.1.55 for org.apache.tomcat:tomcat-catalina -->

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (9)

Affects 1 ecosystem: maven (3).

Package	Ecosystem	Affected	Fixed In
org.apache.tomcat.embed:tomcat-embed-core	maven	11.0.0, 11.0.0-M1, 11.0.0-M10, 11.0.0-M11 (+38 more)	11.0.22
org.apache.tomcat.embed:tomcat-embed-core	maven	7.0.0, 7.0.100, 7.0.103, 7.0.104 (+318 more)	9.0.118
org.apache.tomcat.embed:tomcat-embed-core	maven	10.1.0, 10.1.0-M1, 10.1.0-M10, 10.1.0-M11 (+57 more)	10.1.55
org.apache.tomcat:tomcat-catalina	maven	7.0.0, 7.0.100, 7.0.103, 7.0.104 (+318 more)	9.0.118
org.apache.tomcat:tomcat	maven	11.0.0, 11.0.0-M1, 11.0.0-M10, 11.0.0-M11 (+38 more)	11.0.22
org.apache.tomcat:tomcat-catalina	maven	11.0.0, 11.0.0-M1, 11.0.0-M10, 11.0.0-M11 (+38 more)	11.0.22
org.apache.tomcat:tomcat	maven	10.1.0, 10.1.0-M1, 10.1.0-M10, 10.1.0-M11 (+57 more)	10.1.55
org.apache.tomcat:tomcat	maven	7.0.100, 7.0.103, 7.0.104, 7.0.105 (+294 more)	9.0.118
org.apache.tomcat:tomcat-catalina	maven	10.1.0, 10.1.0-M1, 10.1.0-M10, 10.1.0-M11 (+57 more)	10.1.55

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

CWE-285
Improper AuthorizationMITRE

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 9.1 score means for each attack dimension.

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

None

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

References

Frequently Asked Questions

What is CVE-2026-43515?: Apache Tomcat - Security constraints not correctly applied This vulnerability has been assigned a severity rating of CRITICAL (CVSS score: 9.1/10).
How do I check if my project is affected by CVE-2026-43515?: CVE-2026-43515 affects org.apache.tomcat.embed:tomcat-embed-core, org.apache.tomcat:tomcat-catalina and org.apache.tomcat:tomcat. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2026-43515 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score

9.1

Exploitation is straightforward and causes maximum impact. Patch immediately.

Also Known As

GHSA-5m62-pw8w-7w9f

BIT-tomcat-2026-43515

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