RHSA-2026:99174 - Security Advisory

Topic

An update for tomcat9 is now available for Red Hat Enterprise Linux 10.

Red Hat Product Security has rated this update as having a security impact of Moderate. 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: Improper Input Validation vulnerability due to incomplete fix (CVE-2026-32990)
• tomcat-coyote: Apache Tomcat: Authentication bypass via digest authentication (CVE-2026-43512)
• tomcat-coyote: Apache Tomcat: HTTP/2 request headers not validated (CVE-2026-41293)
• tomcat-coyote: Apache Tomcat: Information disclosure due to HTTP Authentication Header exposure during WebSocket authentication. (CVE-2026-42498)
• tomcat-coyote: tomcat: Improper Authorization allows security bypass (CVE-2026-43515)
• tomcat-catalina: Apache Tomcat: Improper Handling of Case Sensitivity in LockOutRealm (CVE-2026-43513)
• tomcat: Apache Tomcat: Security constraint bypass via improper URL encoding in rewrite valve (CVE-2026-59083)
• tomcat: Apache Tomcat: Insufficient documentation for EncryptInterceptor may lead to insecure configurations (CVE-2026-59084)

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 10 x86_64
• Red Hat Enterprise Linux for IBM z Systems 10 s390x
• Red Hat Enterprise Linux for Power, little endian 10 ppc64le
• Red Hat Enterprise Linux for ARM 64 10 aarch64

Fixes

• BZ - 2457025 - CVE-2026-32990 Apache Tomcat: Apache Tomcat: Improper Input Validation vulnerability due to incomplete fix
• BZ - 2476511 - CVE-2026-43512 tomcat-coyote: Apache Tomcat: Authentication bypass via digest authentication
• BZ - 2476513 - CVE-2026-41293 tomcat-coyote: Apache Tomcat: HTTP/2 request headers not validated
• BZ - 2476516 - CVE-2026-42498 tomcat-coyote: Apache Tomcat: Information disclosure due to HTTP Authentication Header exposure during WebSocket authentication.
• BZ - 2476519 - CVE-2026-43515 tomcat-coyote: tomcat: Improper Authorization allows security bypass
• BZ - 2476520 - CVE-2026-43513 tomcat-catalina: Apache Tomcat: Improper Handling of Case Sensitivity in LockOutRealm
• BZ - 2499917 - CVE-2026-59083 tomcat: Apache Tomcat: Security constraint bypass via improper URL encoding in rewrite valve
• BZ - 2499931 - CVE-2026-59084 tomcat: Apache Tomcat: Insufficient documentation for EncryptInterceptor may lead to insecure configurations

CVEs

• CVE-2026-32990
• CVE-2026-41293
• CVE-2026-42498
• CVE-2026-43512
• CVE-2026-43513
• CVE-2026-43515
• CVE-2026-59083
• CVE-2026-59084

References

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