CVE-2026-25854: Apache Tomcat Apache Tomcat Has An Open Vulnerability

MODERATE
Advisory Identifier: GHSA-9m3c-qcxr-9x87
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CVSS 6.1
CWE-601
Published
Advisory Summary

CVE-2026-25854 is a MODERATE (CVSS 6.1) apache tomcat has an open vulnerability (CWE-601: URL Redirection to Untrusted Site ('Open Redirect')) affecting Apache Tomcat libraries in the Maven ecosystem. The issue involves apache tomcat has an open redirect vulnerability. Remediation is available by upgrading affected packages to version 9.0.116, 10.1.53, 11.0.20.

CVE-2026-25854 at a Glance

CVE Identifier CVE-2026-25854
GHSA Identifier GHSA-9m3c-qcxr-9x87
Severity MODERATE
CVSS v3.1 Base Score 6.1
CWE Classification CWE-601: URL Redirection to Untrusted Site ('Open Redirect')
Affected Product Apache Tomcat
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 6.1

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:R/S:C/C:L/I:L/A:N).

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

How to Fix CVE-2026-25854

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-catalina fixed: 9.0.116 
<dependency>
    <groupId>org.apache.tomcat</groupId>
    <artifactId>tomcat-catalina</artifactId>
    <version>9.0.116</version>
</dependency>
org.apache.tomcat:tomcat-catalina fixed: 10.1.53 
<dependency>
    <groupId>org.apache.tomcat</groupId>
    <artifactId>tomcat-catalina</artifactId>
    <version>10.1.53</version>
</dependency>
org.apache.tomcat:tomcat-catalina fixed: 11.0.20 
<dependency>
    <groupId>org.apache.tomcat</groupId>
    <artifactId>tomcat-catalina</artifactId>
    <version>11.0.20</version>
</dependency>
org.apache.tomcat:tomcat fixed: 9.0.116 
<dependency>
    <groupId>org.apache.tomcat</groupId>
    <artifactId>tomcat</artifactId>
    <version>9.0.116</version>
</dependency>
org.apache.tomcat:tomcat fixed: 10.1.53 
<dependency>
    <groupId>org.apache.tomcat</groupId>
    <artifactId>tomcat</artifactId>
    <version>10.1.53</version>
</dependency>
org.apache.tomcat:tomcat fixed: 11.0.20 
<dependency>
    <groupId>org.apache.tomcat</groupId>
    <artifactId>tomcat</artifactId>
    <version>11.0.20</version>
</dependency>
org.apache.tomcat.embed:tomcat-embed-core fixed: 9.0.116 
<dependency>
    <groupId>org.apache.tomcat.embed</groupId>
    <artifactId>tomcat-embed-core</artifactId>
    <version>9.0.116</version>
</dependency>
org.apache.tomcat.embed:tomcat-embed-core fixed: 10.1.53 
<dependency>
    <groupId>org.apache.tomcat.embed</groupId>
    <artifactId>tomcat-embed-core</artifactId>
    <version>10.1.53</version>
</dependency>
org.apache.tomcat.embed:tomcat-embed-core fixed: 11.0.20 
<dependency>
    <groupId>org.apache.tomcat.embed</groupId>
    <artifactId>tomcat-embed-core</artifactId>
    <version>11.0.20</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-2026-25854, 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 9.0.116), 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-601: URL Redirection to Untrusted Site ('Open Redirect'), where the web application accepts a user-controlled input that specifies a link to an external site, and uses that link in a redirect. 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

Occasional URL redirection to untrusted Site ('Open Redirect') vulnerability in Apache Tomcat via the LoadBalancerDrainingValve. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.18, from 10.1.0-M1 through 10.1.52, from 9.0.0.M23 through 9.0.115, from 8.5.30 through 8.5.100. Other, unsupported versions may also be affected Users are recommended to upgrade to version 11.0.20, 10.1.53 or 9.0.116, which fix the issue.

CVE-2026-25854 Affected Apache Tomcat Versions

9 component(s)
Fixed Versions:
9.0.11610.1.5311.0.20
Product / Package Ecosystem Affected Versions Fixed Version
org.apache.tomcat:tomcat-catalina
maven/org.apache.tomcat/tomcat-catalina
Maven
≥ 8.5.30
< 9.0.116
9.0.116
org.apache.tomcat:tomcat-catalina
maven/org.apache.tomcat/tomcat-catalina
Maven
≥ 10.1.0-M1
< 10.1.53
10.1.53
org.apache.tomcat:tomcat-catalina
maven/org.apache.tomcat/tomcat-catalina
Maven
≥ 11.0.0-M1
< 11.0.20
11.0.20
org.apache.tomcat:tomcat
maven/org.apache.tomcat/tomcat
Maven
≥ 8.5.30
< 9.0.116
9.0.116
org.apache.tomcat:tomcat
maven/org.apache.tomcat/tomcat
Maven
≥ 10.1.0-M1
< 10.1.53
10.1.53
org.apache.tomcat:tomcat
maven/org.apache.tomcat/tomcat
Maven
≥ 11.0.0-M1
< 11.0.20
11.0.20
org.apache.tomcat.embed:tomcat-embed-core
maven/org.apache.tomcat.embed/tomcat-embed-core
Maven
≥ 8.5.30
< 9.0.116
9.0.116
org.apache.tomcat.embed:tomcat-embed-core
maven/org.apache.tomcat.embed/tomcat-embed-core
Maven
≥ 10.1.0-M1
< 10.1.53
10.1.53
org.apache.tomcat.embed:tomcat-embed-core
maven/org.apache.tomcat.embed/tomcat-embed-core
Maven
≥ 11.0.0-M1
< 11.0.20
11.0.20

References

NVD — CVE-2026-25854 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-25854
Apache Tomcat Source Repository REPOSITORY
https://github.com/apache/tomcat
lists.apache.org/thread/ghct3b6o74bp... WEB
https://lists.apache.org/thread/ghct3b6o74bp2vm7q875s1zh0dqrz3h0
Apache Tomcat Security Information SECURITY
http://www.openwall.com/lists/oss-security/2026/04/09/21

Frequently Asked Questions

What is CVE-2026-25854?
CVE-2026-25854 is a security vulnerability in Apache Tomcat involving Apache Tomcat has an Open Redirect vulnerability under CWE-601: URL Redirection to Untrusted Site ('Open Redirect').
Which Apache Tomcat versions are affected?
Affected versions include releases prior to 9.0.116, 10.1.53, 11.0.20 across affected packages: org.apache.tomcat:tomcat-catalina, org.apache.tomcat:tomcat, org.apache.tomcat.embed:tomcat-embed-core.
What version fixes CVE-2026-25854?
Upgrading to 9.0.116, 10.1.53, 11.0.20 (or the latest patched release for your respective branch) resolves the vulnerability.
Is tomcat-catalina affected?
Yes, org.apache.tomcat:tomcat-catalina is affected in releases prior to 9.0.116, 10.1.53, 11.0.20. Upgrade your dependency to 9.0.116, 10.1.53, 11.0.20 or later.
Is tomcat affected?
Yes, org.apache.tomcat:tomcat is affected in releases prior to 9.0.116, 10.1.53, 11.0.20. Upgrade your dependency to 9.0.116, 10.1.53, 11.0.20 or later.
What is the CVSS score of CVE-2026-25854?
CVE-2026-25854 has a CVSS v3.1 base score of 6.1 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.
What CWE is associated with CVE-2026-25854?
CVE-2026-25854 is classified under CWE-601: URL Redirection to Untrusted Site ('Open Redirect') (The web application accepts a user-controlled input that specifies a link to an external site, and uses that link in a redirect.).
How can I check Maven dependencies for CVE-2026-25854?
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 
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  "schema_version" : "1.4.0",
  "id" : "GHSA-9m3c-qcxr-9x87",
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  "aliases" : [ "CVE-2026-25854" ],
  "summary" : "Apache Tomcat has an Open Redirect vulnerability",
  "details" : "Occasional URL redirection to untrusted Site ('Open Redirect') vulnerability in Apache Tomcat via the LoadBalancerDrainingValve.\n\nThis issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.18, from 10.1.0-M1 through 10.1.52, from 9.0.0.M23 through 9.0.115, from 8.5.30 through 8.5.100.\nOther, unsupported versions may also be affected\n\nUsers are recommended to upgrade to version 11.0.20, 10.1.53 or 9.0.116, which fix the issue.",
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}