RHSA-2026:36789 - Security Advisory

Topic

An update for tomcat9 is now available for Red Hat Enterprise Linux 10.0 Extended Update Support.

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

Tomcat is the servlet container that is used in the official Reference Implementation for the Java Servlet and JavaServer Pages technologies. The Java Servlet and JavaServer Pages specifications are developed by Sun under the Java Community Process. Tomcat is developed in an open and participatory environment and released under the Apache Software License version 2.0. Tomcat is intended to be a collaboration of the best-of-breed developers from around the world.

Security Fix(es):

• Apache Tomcat: Apache Tomcat: Information disclosure via Padding Oracle vulnerability in EncryptInterceptor (CVE-2026-29146)
• Apache Tomcat: Apache Tomcat: Missing Encryption of Sensitive Data due to EncryptInterceptor bypass (CVE-2026-34486)

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 - Extended Update Support 10.0 x86_64
• Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 10.0 s390x
• Red Hat Enterprise Linux for Power, little endian - Extended Update Support 10.0 ppc64le
• Red Hat Enterprise Linux for ARM 64 - Extended Update Support 10.0 aarch64
• Red Hat Enterprise Linux for ARM 64 - 4 years of updates 10.0 aarch64
• Red Hat Enterprise Linux for IBM z Systems - 4 years of updates 10.0 s390x
• Red Hat Enterprise Linux for Power, little endian - 4 years of support 10.0 ppc64le
• Red Hat Enterprise Linux for x86_64 - 4 years of updates 10.0 x86_64

Fixes

• BZ - 2457020 - CVE-2026-29146 Apache Tomcat: Apache Tomcat: Information disclosure via Padding Oracle vulnerability in EncryptInterceptor
• BZ - 2457027 - CVE-2026-34486 Apache Tomcat: Apache Tomcat: Missing Encryption of Sensitive Data due to EncryptInterceptor bypass

CVEs

• CVE-2026-29146
• CVE-2026-34486

References

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