CVE-2026-65182: Apache Tomcat Apache Tomcat Has An Improper Vulnerability

CRITICAL
Advisory Identifier: GHSA-gcx9-497g-6cp6
Share
CVSS 9.1
CWE-284
Published
Advisory Summary

CVE-2026-65182 is a CRITICAL (CVSS 9.1) apache tomcat has an improper vulnerability (CWE-284: Improper Access Control) affecting Apache Tomcat libraries in the Maven ecosystem. The issue involves apache tomcat has an improper access control, incorrect authorization vulnerability. Remediation is available by upgrading affected packages to version 11.0.25, 10.1.58, 9.0.121.

CVE-2026-65182 at a Glance

CVE Identifier CVE-2026-65182
GHSA Identifier GHSA-gcx9-497g-6cp6
Severity CRITICAL
CVSS v3.1 Base Score 9.1
CWE Classification CWE-284: Improper Access Control
Affected Product Apache Tomcat
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 9.1

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality High (C:H)
Integrity High (I:H)
Availability None (A:N)

How to Fix CVE-2026-65182

To remediate this vulnerability, upgrade all affected Apache Tomcat dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

org.apache.tomcat:tomcat fixed: 11.0.25 
<dependency>
    <groupId>org.apache.tomcat</groupId>
    <artifactId>tomcat</artifactId>
    <version>11.0.25</version>
</dependency>
org.apache.tomcat:tomcat fixed: 10.1.58 
<dependency>
    <groupId>org.apache.tomcat</groupId>
    <artifactId>tomcat</artifactId>
    <version>10.1.58</version>
</dependency>
org.apache.tomcat:tomcat fixed: 9.0.121 
<dependency>
    <groupId>org.apache.tomcat</groupId>
    <artifactId>tomcat</artifactId>
    <version>9.0.121</version>
</dependency>
org.apache.tomcat:tomcat fixed: Latest secure release 
<dependency>
    <groupId>org.apache.tomcat</groupId>
    <artifactId>tomcat</artifactId>
    <version>Latest secure release</version>
</dependency>
org.apache.tomcat:tomcat fixed: Latest secure release 
<dependency>
    <groupId>org.apache.tomcat</groupId>
    <artifactId>tomcat</artifactId>
    <version>Latest secure release</version>
</dependency>
org.apache.tomcat:tomcat-catalina fixed: 11.0.25 
<dependency>
    <groupId>org.apache.tomcat</groupId>
    <artifactId>tomcat-catalina</artifactId>
    <version>11.0.25</version>
</dependency>
org.apache.tomcat:tomcat-catalina fixed: 10.1.58 
<dependency>
    <groupId>org.apache.tomcat</groupId>
    <artifactId>tomcat-catalina</artifactId>
    <version>10.1.58</version>
</dependency>
org.apache.tomcat:tomcat-catalina fixed: 9.0.121 
<dependency>
    <groupId>org.apache.tomcat</groupId>
    <artifactId>tomcat-catalina</artifactId>
    <version>9.0.121</version>
</dependency>
org.apache.tomcat:tomcat-catalina fixed: Latest secure release 
<dependency>
    <groupId>org.apache.tomcat</groupId>
    <artifactId>tomcat-catalina</artifactId>
    <version>Latest secure release</version>
</dependency>
org.apache.tomcat:tomcat-catalina fixed: Latest secure release 
<dependency>
    <groupId>org.apache.tomcat</groupId>
    <artifactId>tomcat-catalina</artifactId>
    <version>Latest secure release</version>
</dependency>
org.apache.tomcat.embed:tomcat-embed-core fixed: 11.0.25 
<dependency>
    <groupId>org.apache.tomcat.embed</groupId>
    <artifactId>tomcat-embed-core</artifactId>
    <version>11.0.25</version>
</dependency>
org.apache.tomcat.embed:tomcat-embed-core fixed: 10.1.58 
<dependency>
    <groupId>org.apache.tomcat.embed</groupId>
    <artifactId>tomcat-embed-core</artifactId>
    <version>10.1.58</version>
</dependency>
org.apache.tomcat.embed:tomcat-embed-core fixed: 9.0.121 
<dependency>
    <groupId>org.apache.tomcat.embed</groupId>
    <artifactId>tomcat-embed-core</artifactId>
    <version>9.0.121</version>
</dependency>
org.apache.tomcat.embed:tomcat-embed-core fixed: Latest secure release 
<dependency>
    <groupId>org.apache.tomcat.embed</groupId>
    <artifactId>tomcat-embed-core</artifactId>
    <version>Latest secure release</version>
</dependency>
org.apache.tomcat.embed:tomcat-embed-core fixed: Latest secure release 
<dependency>
    <groupId>org.apache.tomcat.embed</groupId>
    <artifactId>tomcat-embed-core</artifactId>
    <version>Latest secure release</version>
</dependency>
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

mvn dependency:tree -Dincludes=org.apache.tomcat

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2026-65182, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree -Dincludes=org.apache.tomcat

Analyze the terminal output to locate any version of Apache Tomcat in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 11.0.25), your application is affected.

Note: The mvn dependency:tree -Dincludes=org.apache.tomcat command inspects the resolved dependency graph declared in your project's POM files; it does not perform automated security scanning or inspect runtime dynamic classpaths. Always verify runtime container classpaths and shaded JARs.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-284: Improper Access Control, where the product does not restrict or incorrectly restricts access to a resource from an unauthorized actor. In Apache Tomcat, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

Improper Access Control, Incorrect Authorization vulnerability in Apache Tomcat leads to security constraint bypass if a constraint for a longer path is specified before a more restrictive constraint for a shorter sub-path. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.24, from 10.1.0-M1 through 10.1.57, from 9.0.0.M1 through 9.0.120, from 8.5.0 through 8.5.100, from 7.0.0 through 7.0.109. Users are recommended to upgrade to version 11.0.25, 10.1.58, 9.0.121, which fixes the issue.

CVE-2026-65182 Affected Apache Tomcat Versions

15 component(s)
Fixed Versions:
11.0.2510.1.589.0.121
Product / Package Ecosystem Affected Versions Fixed Version
org.apache.tomcat:tomcat
maven/org.apache.tomcat/tomcat
Maven
≥ 11.0.0-M1
< 11.0.25
11.0.25
org.apache.tomcat:tomcat
maven/org.apache.tomcat/tomcat
Maven
≥ 10.1.0-M1
< 10.1.58
10.1.58
org.apache.tomcat:tomcat
maven/org.apache.tomcat/tomcat
Maven
≥ 9.0.0-M1
< 9.0.121
9.0.121
org.apache.tomcat:tomcat
maven/org.apache.tomcat/tomcat
Maven
≥ 8.5.0
≤ 8.5.100
org.apache.tomcat:tomcat
maven/org.apache.tomcat/tomcat
Maven
≥ 7.0.0
≤ 7.0.109
org.apache.tomcat:tomcat-catalina
maven/org.apache.tomcat/tomcat-catalina
Maven
≥ 11.0.0-M1
< 11.0.25
11.0.25
org.apache.tomcat:tomcat-catalina
maven/org.apache.tomcat/tomcat-catalina
Maven
≥ 10.1.0-M1
< 10.1.58
10.1.58
org.apache.tomcat:tomcat-catalina
maven/org.apache.tomcat/tomcat-catalina
Maven
≥ 9.0.0-M1
< 9.0.121
9.0.121
org.apache.tomcat:tomcat-catalina
maven/org.apache.tomcat/tomcat-catalina
Maven
≥ 8.5.0
≤ 8.5.100
org.apache.tomcat:tomcat-catalina
maven/org.apache.tomcat/tomcat-catalina
Maven
≥ 7.0.0
≤ 7.0.109
org.apache.tomcat.embed:tomcat-embed-core
maven/org.apache.tomcat.embed/tomcat-embed-core
Maven
≥ 11.0.0-M1
< 11.0.25
11.0.25
org.apache.tomcat.embed:tomcat-embed-core
maven/org.apache.tomcat.embed/tomcat-embed-core
Maven
≥ 10.1.0-M1
< 10.1.58
10.1.58
org.apache.tomcat.embed:tomcat-embed-core
maven/org.apache.tomcat.embed/tomcat-embed-core
Maven
≥ 9.0.0-M1
< 9.0.121
9.0.121
org.apache.tomcat.embed:tomcat-embed-core
maven/org.apache.tomcat.embed/tomcat-embed-core
Maven
≥ 8.5.0
≤ 8.5.100
org.apache.tomcat.embed:tomcat-embed-core
maven/org.apache.tomcat.embed/tomcat-embed-core
Maven
≥ 7.0.0
≤ 7.0.109

References

NVD — CVE-2026-65182 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-65182
Security Fix Commit FIX COMMIT
https://github.com/apache/tomcat/commit/8bafd79a3b54684e80e9cb1bafd4746aede7d3f5
Security Fix Commit FIX COMMIT
https://github.com/apache/tomcat/commit/b2c56ec8f20c66773a1a813034ffcdb60841f1cf
Security Fix Commit FIX COMMIT
https://github.com/apache/tomcat/commit/b79752d2a8578d94743e2a95c50af297f780c0df
lists.apache.org/thread/joosxvzc9b49... WEB
https://lists.apache.org/thread/joosxvzc9b49ttj8lj0jw9mqt0ml767m
Apache Tomcat Security Information SECURITY
https://tomcat.apache.org/security-10.html
Apache Tomcat Security Information SECURITY
https://tomcat.apache.org/security-11.html
Apache Tomcat Security Information SECURITY
https://tomcat.apache.org/security-9.html
Apache Tomcat Security Information SECURITY
http://www.openwall.com/lists/oss-security/2026/08/26/1

Frequently Asked Questions

What is CVE-2026-65182?
CVE-2026-65182 is a security vulnerability in Apache Tomcat involving Apache Tomcat has an Improper Access Control, Incorrect Authorization vulnerability under CWE-284: Improper Access Control.
Which Apache Tomcat versions are affected?
Affected versions include releases prior to 11.0.25, 10.1.58, 9.0.121 across affected packages: org.apache.tomcat:tomcat, org.apache.tomcat:tomcat-catalina, org.apache.tomcat.embed:tomcat-embed-core.
What version fixes CVE-2026-65182?
Upgrading to 11.0.25, 10.1.58, 9.0.121 (or the latest patched release for your respective branch) resolves the vulnerability.
Is tomcat affected?
Yes, org.apache.tomcat:tomcat is affected in releases prior to 11.0.25, 10.1.58, 9.0.121, Latest secure release. Upgrade your dependency to 11.0.25, 10.1.58, 9.0.121, Latest secure release or later.
Is tomcat-catalina affected?
Yes, org.apache.tomcat:tomcat-catalina is affected in releases prior to 11.0.25, 10.1.58, 9.0.121, Latest secure release. Upgrade your dependency to 11.0.25, 10.1.58, 9.0.121, Latest secure release or later.
What is the CVSS score of CVE-2026-65182?
CVE-2026-65182 has a CVSS v3.1 base score of 9.1 (CRITICAL) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.
What CWE is associated with CVE-2026-65182?
CVE-2026-65182 is classified under CWE-284: Improper Access Control (The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.).
How can I check Maven dependencies for CVE-2026-65182?
Run the dependency tree command: 'mvn dependency:tree -Dincludes=org.apache.tomcat'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-gcx9-497g-6cp6",
  "modified" : "2026-09-02T22:37:43Z",
  "published" : "2026-08-26T00:30:52Z",
  "aliases" : [ "CVE-2026-65182" ],
  "summary" : "Apache Tomcat has an Improper Access Control, Incorrect Authorization vulnerability",
  "details" : "Improper Access Control, Incorrect Authorization vulnerability in Apache Tomcat leads to security constraint bypass if a constraint for a longer path is specified before a more restrictive constraint for a shorter sub-path.\n\nThis issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.24, from 10.1.0-M1 through 10.1.57, from 9.0.0.M1 through 9.0.120, from 8.5.0 through 8.5.100, from 7.0.0 through 7.0.109.\n\nUsers are recommended to upgrade to version 11.0.25, 10.1.58, 9.0.121, which fixes the issue.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N"
  } ],
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    },
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    },
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    },
    "ranges" : [ {
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    "package" : {
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    },
    "ranges" : [ {
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    },
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    } ]
  }, {
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      "name" : "org.apache.tomcat.embed:tomcat-embed-core"
    },
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      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-65182"
  }, {
    "type" : "WEB",
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  }, {
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  }, {
    "type" : "WEB",
    "url" : "https://github.com/apache/tomcat/commit/b79752d2a8578d94743e2a95c50af297f780c0df"
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    "type" : "WEB",
    "url" : "https://lists.apache.org/thread/joosxvzc9b49ttj8lj0jw9mqt0ml767m"
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    "url" : "https://tomcat.apache.org/security-10.html"
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    "type" : "WEB",
    "url" : "https://tomcat.apache.org/security-11.html"
  }, {
    "type" : "WEB",
    "url" : "https://tomcat.apache.org/security-9.html"
  }, {
    "type" : "WEB",
    "url" : "http://www.openwall.com/lists/oss-security/2026/08/26/1"
  } ],
  "database_specific" : {
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    "severity" : "CRITICAL",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-09-02T22:37:43Z",
    "nvd_published_at" : "2026-08-25T22:17:04Z"
  }
}