High Threat Security Alert (A26-08-02): Multiple Vulnerabilities in Apache Tomcat

Description:

The Apache Software Foundation released security updates to address multiple vulnerabilities in the Apache Tomcat. A remote attacker could exploit the vulnerabilities by sending a specially crafted request to the affected systems.

Reports indicated that an information disclosure vulnerability (CVE-2026-34486) is being exploited in the wild. System administrators are advised to take immediate action to patch your affected systems to mitigate the elevated risk of cyber attacks.

Affected Systems:

• Apache Tomcat version 9.0.13 to 9.0.116
• Apache Tomcat version 10.1.0-M1 to 10.1.53
• Apache Tomcat version 11.0.0-M1 to 11.0.20

For detailed information of the affected systems, please refer to the corresponding security advisories at vendor's website.

Impact:

Successful exploitation of the vulnerabilities could lead to information disclosure, security restriction bypass or tampering on an affected system.

Recommendation:

The Apache Software Foundation has released new versions of the software to address the issues and they can be downloaded at the following URLs:
https://tomcat.apache.org/security-9.html#Fixed_in_Apache_Tomcat_9.0.117
https://tomcat.apache.org/security-10.html#Fixed_in_Apache_Tomcat_10.1.54
https://tomcat.apache.org/security-11.html#Fixed_in_Apache_Tomcat_11.0.21

More Information:

• https://tomcat.apache.org/security-9.html#Fixed_in_Apache_Tomcat_9.0.117
• https://tomcat.apache.org/security-10.html#Fixed_in_Apache_Tomcat_10.1.54
• https://tomcat.apache.org/security-11.html#Fixed_in_Apache_Tomcat_11.0.21
• https://www.hkcert.org/security-bulletin/apache-tomcat-multiple-vulnerabilities_20260805
• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-29146
• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-34483
• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-34486 (to CVE-2026-34487)
• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-34500