ALAS2TOMCAT9-2025-016

References: CVE-2025-24813  CVE-2026-55957 
FAQs regarding Amazon Linux ALAS/CVE Severity

Issue Overview:

Path Equivalence: 'file.Name' (Internal Dot) leading to Remote Code Execution and/or Information disclosure and/or malicious content added to uploaded files via write enabled Default Servlet in Apache Tomcat.

This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.2, from 10.1.0-M1 through 10.1.34, from 9.0.0.M1 through 9.0.98.

If all of the following were true, a malicious user was able to view security sensitive files and/or inject content into those files:
- writes enabled for the default servlet (disabled by default)
- support for partial PUT (enabled by default)
- a target URL for security sensitive uploads that was a sub-directory of a target URL for public uploads
- attacker knowledge of the names of security sensitive files being uploaded
- the security sensitive files also being uploaded via partial PUT

If all of the following were true, a malicious user was able to perform remote code execution:
- writes enabled for the default servlet (disabled by default)
- support for partial PUT (enabled by default)
- application was using Tomcat's file based session persistence with the default storage location
- application included a library that may be leveraged in a deserialization attack

Users are recommended to upgrade to version 11.0.3, 10.1.35, 9.0.99 or later, which fixes the issue.

More justification and the patch links are available for all versions here:
[1] https://tomcat.apache.org/security-11.html
[2] https://tomcat.apache.org/security-10.html
[3] https://tomcat.apache.org/security-9.html (CVE-2025-24813)

Missing Critical Step in Authentication vulnerability in Apache Tomcat when the JNDIRealm was configured to authenticate binds using GSSAPI allowed attackers to authenticate without provided the correct password.

This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.4, from 10.1.0-M1 through 10.1.36, from 9.0.0.M1 through 9.0.100, from 8.5.0 through 8.5.100, from 7.0.0 through 7.0.109.

Users are recommended to upgrade to version 11.0.5, 10.1.37 or 9.0.101, which fixes the issue. (CVE-2026-55957)

Issue Correction:
Run yum update tomcat or yum update --advisory ALAS2TOMCAT9-2025-016 to update your system.

New Packages:

noarch:
    tomcat-9.0.102-1.amzn2.0.1.noarch
    tomcat-admin-webapps-9.0.102-1.amzn2.0.1.noarch
    tomcat-docs-webapp-9.0.102-1.amzn2.0.1.noarch
    tomcat-jsvc-9.0.102-1.amzn2.0.1.noarch
    tomcat-jsp-2.3-api-9.0.102-1.amzn2.0.1.noarch
    tomcat-lib-9.0.102-1.amzn2.0.1.noarch
    tomcat-servlet-4.0-api-9.0.102-1.amzn2.0.1.noarch
    tomcat-el-3.0-api-9.0.102-1.amzn2.0.1.noarch
    tomcat-webapps-9.0.102-1.amzn2.0.1.noarch

src:
    tomcat-9.0.102-1.amzn2.0.1.src

Changelog:

2026-07-13: CVE-2026-55957 was added to this advisory.