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High ALAS2-2026-4019 2 CVEs

Important: tomcat security update (Amazon Linux 2)

Published Oct 26, 2026 · Updated Oct 26, 2026

Summary

Package updates are available for Amazon Linux 2 that fix the following vulnerabilities: CVE-2026-78383: Allocation of resources without limits or throttling vulnerability in Apache Tomcat allows an unauthenticated AJP request to pin an AJP processing thread leading to denial of service. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.25, from 10.1.0-M1 through 10.1.59, from 9.0.0.M1 through 9.0.121. The following versions were EOL at the time the CVE was created but are known to be affected: from 8.5.0 through 8.5.100, from 7.0.0 through 7.0.109. Other unsupported versions may also be affected. Users are recommended to upgrade to version 11.0.26, 10.1.60 or 9.0.122, which fix the issue. CVE-2026-76183: Authentication Bypass by Alternate Name vulnerability in Apache Tomcat allowed the security constraints for any WebSocket endpoint to be bypassed. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.25, from 10.1.0-M1 through 10.1.59, from 9.0.0.M1 through 9.0.121. The following versions were EOS at the time the CVE was created but are known to be affected: from 8.5.0 through 8.5.100, from 7.0.43 through 7.0.109. Other unsupported versions may also be affected. Users are recommended to upgrade to version 11.0.26, 10.1.60 or 9.0.122, which fix the issue.

Fixed packages 10

ReleasePackageFixed in
Amazon Linux · 2 tomcat 0:7.0.76-10.amzn2.0.19
Amazon Linux · 2 tomcat-admin-webapps 0:7.0.76-10.amzn2.0.19
Amazon Linux · 2 tomcat-docs-webapp 0:7.0.76-10.amzn2.0.19
Amazon Linux · 2 tomcat-el-2.2-api 0:7.0.76-10.amzn2.0.19
Amazon Linux · 2 tomcat-javadoc 0:7.0.76-10.amzn2.0.19
Amazon Linux · 2 tomcat-jsp-2.2-api 0:7.0.76-10.amzn2.0.19
Amazon Linux · 2 tomcat-jsvc 0:7.0.76-10.amzn2.0.19
Amazon Linux · 2 tomcat-lib 0:7.0.76-10.amzn2.0.19
Amazon Linux · 2 tomcat-servlet-3.0-api 0:7.0.76-10.amzn2.0.19
Amazon Linux · 2 tomcat-webapps 0:7.0.76-10.amzn2.0.19

Vulnerabilities 2

  • Critical 9.8
    CVE-2026-76183 Public exploit

    Apache Tomcat: Bypass of security constraints for WebSocket endpoints

    Authentication Bypass by Alternate Name vulnerability in Apache Tomcat allowed the security constraints for any WebSocket endpoint to be bypassed. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.25, from 10.1.0-M1 through 10.1.59, from 9.0.0.M1 …

  • High 7.5

    Apache Tomcat: AJP DoS via missing request body

    Allocation of resources without limits or throttling vulnerability in Apache Tomcat allows an unauthenticated AJP request to pin an AJP processing thread leading to denial of service. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.25, from 10.1…

References

  • web
    https://alas.aws.amazon.com/cve/html/CVE-2026-76183.html
  • web
    https://alas.aws.amazon.com/cve/html/CVE-2026-78383.html