Amazon Linux 2023 Security Advisory: ALAS2023-2026-1945
Advisory Released Date: 2026-07-20
Advisory Updated Date: 2026-07-20
FAQs regarding Amazon Linux ALAS/CVE Severity
Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS) vulnerability in the number guess example for Apache Tomcat.
This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.22, from 10.1.0-M1 through 10.1.55, from 9.0.0.M1 through 9.0.118, from 8.5.0 through 8.5.100, from 7.0.0 through 7.0.109. Other versions that have reached end of support may also be affected.
Users are recommended to upgrade to version 11.0.23, 10.1.56 or 9.0.119, which fix the issue. (CVE-2026-50229)
Always-Incorrect Control Flow Implementation vulnerability in Apache Tomcat's rewrite valve meant that if the first condition in an OR chain matched, subsequent non-OR conditions were skipped.
This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.22, from 10.1.0-M1 through 10.1.55, from 9.0.0.M1 through 9.0.118, from 8.5.0 through 8.5.100. Other versions that have reached end of support may also be affected.
Users are recommended to upgrade to version 11.0.23, 10.1.56 or 9.0.119, which fix the issue. (CVE-2026-53404)
Detection of Error Condition Without Action vulnerability in Apache Tomcat when configuring CRLs for a FFM based connector.
This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.22, from 10.1.0-M7 through 10.1.55, from 9.0.83 through 9.0.118.
Users are recommended to upgrade to version 11.0.23, 10.1.56 or 9.0.119, which fixes the issue. (CVE-2026-53434)
Always-Incorrect Control Flow Implementation vulnerability in Apache Tomcat meant that special roles and empty authorisation constraints were not included when the effective web.xml was logged.
This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.22, from 10.1.0-M1 through 10.1.55, from 9.0.0.M1 through 9.0.118, from 8.5.0 through 8.5.100. Other versions that have reached end of support may also be affected.
Users are recommended to upgrade to version 11.0.23, 10.1.56 or 9.0.119 which fixes the issue. (CVE-2026-55276)
Improper Authentication vulnerability in Apache Tomcat allowed a replay attack against the EncryptionInterceptor in the cluster component.
This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.22, from 10.1.0-M1 through 10.1.55, from 9.0.13 through 9.0.18, from 8.5.38 through 8.5.100, from 7.0.100 through 7.0.109.
Users are recommended to upgrade to version 11.0.23, 10.1.56, 9.0.119, which fixes the issue. (CVE-2026-55955)
Improper Authorization vulnerability in Apache Tomcat leads to security constraints specified for the default servlet ignoring any method or method omission configured as part of the constraint.
This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.22, from 10.1.0-M1 through 10.1.55, from 9.0.0.M1 through 9.0.118, from 8.5.0 through 8.5.100, from 7.0.0 through 7.0.109. Other versions that have reached end of support may also be affected.
Users are recommended to upgrade to version 11.0.23, 10.1.56 or 9.0.119, which fix the issue. (CVE-2026-55956)
Affected Packages:
tomcat9
Issue Correction:
Run dnf update tomcat9 --releasever 2023.12.20260720 or dnf update --advisory ALAS2023-2026-1945 --releasever 2023.12.20260720 to update your system.
More information on how to update your system can be found on this page: Amazon Linux 2023 documentation
noarch:
tomcat9-webapps-9.0.120-1.amzn2023.0.1.noarch
tomcat9-jsp-2.3-api-9.0.120-1.amzn2023.0.1.noarch
tomcat9-admin-webapps-9.0.120-1.amzn2023.0.1.noarch
tomcat9-servlet-4.0-api-9.0.120-1.amzn2023.0.1.noarch
tomcat9-9.0.120-1.amzn2023.0.1.noarch
tomcat9-el-3.0-api-9.0.120-1.amzn2023.0.1.noarch
tomcat9-docs-webapp-9.0.120-1.amzn2023.0.1.noarch
tomcat9-lib-9.0.120-1.amzn2023.0.1.noarch
src:
tomcat9-9.0.120-1.amzn2023.0.1.src