RHSA-2026:98523 - Security Advisory

Topic

An update for tomcat is now available for Red Hat Enterprise Linux 9.

Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Description

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.

Solution

For details on how to apply this update, which includes the changes described in this advisory, refer to:

https://access.redhat.com/articles/11258

Affected Products

• Red Hat Enterprise Linux for x86_64 9 x86_64
• Red Hat Enterprise Linux for IBM z Systems 9 s390x
• Red Hat Enterprise Linux for Power, little endian 9 ppc64le
• Red Hat Enterprise Linux for ARM 64 9 aarch64

Fixes

• BZ - 2524151 - CVE-2026-65182 tomcat: Apache Tomcat: Security constraint bypass due to improper access control
• BZ - 2524154 - CVE-2026-65927 tomcat: Apache Tomcat: Access control bypass due to off-by-one error in RewriteValve [N] flag processing
• BZ - 2524155 - CVE-2026-65637 tomcat: Apache Tomcat: Improper Input Validation allows HTTP/2 no-authority bypass of strict SNI validation
• BZ - 2524160 - CVE-2026-68569 tomcat: Apache Tomcat: Improper Authentication due to principal lookup failure
• BZ - 2524161 - CVE-2026-65905 tomcat: Apache Tomcat: Authentication bypass via limited replay attack in DIGEST authenticator
• BZ - 2524162 - CVE-2026-68525 tomcat: Apache Tomcat: Unauthorized resource access via FORM authentication bypass
• BZ - 2524166 - CVE-2026-68763 tomcat: Apache Tomcat: Denial of Service via HTTP/2 allocation leak

CVEs

• CVE-2026-65182
• CVE-2026-65637
• CVE-2026-65905
• CVE-2026-65927
• CVE-2026-68525
• CVE-2026-68569
• CVE-2026-68763

References

• https://access.redhat.com/security/updates/classification/#important