RHSA-2026:98523: Important: tomcat security update
Apache Tomcat is a servlet container for the Java Servlet and JavaServer Pages (JSP) technologies.Security Fix(es): tomcat: Apache Tomcat: Security constraint bypass due to improper access control (CVE-2026-65182) tomcat: Apache Tomcat: Access control bypass due to off-by-one error in RewriteValve [N] flag processing (CVE-2026-65927) tomcat: Apache Tomcat: Improper Input Validation allows HTTP/2 no-authority bypass of strict SNI validation (CVE-2026-65637) tomcat: Apache Tomcat: Improper Authentication due to principal lookup failure (CVE-2026-68569) tomcat: Apache Tomcat: Authentication bypass via limited replay attack in DIGEST authenticator (CVE-2026-65905) tomcat: Apache Tomcat: Unauthorized resource access via FORM authentication bypass (CVE-2026-68525) tomcat: Apache Tomcat: Denial of Service via HTTP/2 allocation leak (CVE-2026-68763) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
redhat/tomcatto a version that resolves this vulnerability.Fixed in 9.0.121-3.el9_9 - Upgrade
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redhat/tomcat-admin-webappsto a version that resolves this vulnerability.Fixed in 9.0.121-3.el9_9 - Upgrade
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redhat/tomcat-docs-webappto a version that resolves this vulnerability.Fixed in 9.0.121-3.el9_9 - Upgrade
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redhat/tomcat-elto a version that resolves this vulnerability.Fixed in 3.0-api-9.0.121-3.el9_9 - Upgrade
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redhat/tomcat-jspto a version that resolves this vulnerability.Fixed in 2.3-api-9.0.121-3.el9_9 - Upgrade
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redhat/tomcat-libto a version that resolves this vulnerability.Fixed in 9.0.121-3.el9_9 - Upgrade
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redhat/tomcat-servletto a version that resolves this vulnerability.Fixed in 4.0-api-9.0.121-3.el9_9 - Upgrade
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redhat/tomcat-webappsto a version that resolves this vulnerability.Fixed in 9.0.121-3.el9_9
Event History
Frequently Asked Questions
Which installed components are covered by this update?
The update covers redhat/tomcat and the associated admin webapps, documentation webapp, EL, JSP, library, servlet, and webapps packages.
What types of impact are addressed?
The fixes address multiple access-control and authentication bypasses, unauthorized resource access, an HTTP/2 strict-SNI validation bypass, and a denial-of-service condition caused by an HTTP/2 allocation leak.
Which configurations or features are specifically implicated?
The advisory identifies RewriteValve [N] flag processing, HTTP/2 handling, strict SNI validation, DIGEST authentication, FORM authentication, and principal lookup behavior as affected areas.