Amazon Linux 2 (EOS) Security Advisory: ALAS2-2026-4019
Advisory Released Date: 2026-10-24
Advisory Updated Date: 2026-10-26
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. (CVE-2026-76183)
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-2026-78383)
Affected Packages:
tomcat
Note:
This advisory is applicable to Amazon Linux 2 (AL2) Core repository. Visit this FAQ section for the difference between AL2 Core and AL2 Extras advisories.
Issue Correction:
Run yum update tomcat or yum update --advisory ALAS2-2026-4019 to update your system.
noarch:
tomcat-7.0.76-10.amzn2.0.19.noarch
tomcat-admin-webapps-7.0.76-10.amzn2.0.19.noarch
tomcat-docs-webapp-7.0.76-10.amzn2.0.19.noarch
tomcat-javadoc-7.0.76-10.amzn2.0.19.noarch
tomcat-jsvc-7.0.76-10.amzn2.0.19.noarch
tomcat-jsp-2.2-api-7.0.76-10.amzn2.0.19.noarch
tomcat-lib-7.0.76-10.amzn2.0.19.noarch
tomcat-servlet-3.0-api-7.0.76-10.amzn2.0.19.noarch
tomcat-el-2.2-api-7.0.76-10.amzn2.0.19.noarch
tomcat-webapps-7.0.76-10.amzn2.0.19.noarch
src:
tomcat-7.0.76-10.amzn2.0.19.src