RHSA-2026:25341 - 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 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):

• tomcat: Apache Tomcat: Certificate revocation bypass due to improper OCSP response validation (CVE-2026-24734)
• tomcat: Client certificate verification bypass due to virtual host mapping (CVE-2025-66614)
• tomcat: security constraint bypass with HTTP/0.9 (CVE-2026-24733)
• Apache Tomcat: Apache Tomcat: Authentication bypass due to CLIENT_CERT soft fail misconfiguration (CVE-2026-29145)
• Apache Tomcat: Apache Tomcat: Information disclosure via sensitive data in log files (CVE-2026-34487)
• Apache Tomcat: Apache Tomcat: Open Redirect vulnerability via LoadBalancerDrainingValve (CVE-2026-25854)
• Apache Tomcat: Apache Tomcat: HTTP Request/Response Smuggling via invalid chunk extension (CVE-2026-24880)
• Apache Tomcat: Apache Tomcat: Authentication bypass via client certificate misconfiguration (CVE-2026-34500)
• Apache Tomcat: Apache Tomcat: Information disclosure due to improper encoding in JsonAccessLogValve (CVE-2026-34483)

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 x86_64 - Extended Update Support 10.2 x86_64
• Red Hat Enterprise Linux for IBM z Systems 10 s390x
• Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 10.2 s390x
• Red Hat Enterprise Linux for Power, little endian 10 ppc64le
• Red Hat Enterprise Linux for Power, little endian - Extended Update Support 10.2 ppc64le
• Red Hat Enterprise Linux for ARM 64 10 aarch64
• Red Hat Enterprise Linux for ARM 64 - Extended Update Support 10.2 aarch64
• Red Hat Enterprise Linux for ARM 64 - 4 years of updates 10.2 aarch64
• Red Hat Enterprise Linux for IBM z Systems - 4 years of updates 10.2 s390x
• Red Hat Enterprise Linux for Power, little endian - 4 years of support 10.2 ppc64le
• Red Hat Enterprise Linux for x86_64 - 4 years of updates 10.2 x86_64
• Red Hat Enterprise Linux for x86_64 - Extended Life Cycle 10.2 x86_64
• Red Hat Enterprise Linux for ARM 64 - Extended Life Cycle 10.2 aarch64
• Red Hat Enterprise Linux for Power, little endian - Extended Life Cycle 10.2 ppc64le
• Red Hat Enterprise Linux for IBM z Systems - Extended Life Cycle 10.2 s390x

Fixes

• BZ - 2440426 - CVE-2026-24734 tomcat: Apache Tomcat: Certificate revocation bypass due to improper OCSP response validation
• BZ - 2440430 - CVE-2025-66614 tomcat: Client certificate verification bypass due to virtual host mapping
• BZ - 2440437 - CVE-2026-24733 tomcat: security constraint bypass with HTTP/0.9
• BZ - 2457037 - CVE-2026-29145 Apache Tomcat: Apache Tomcat: Authentication bypass due to CLIENT_CERT soft fail misconfiguration
• BZ - 2457038 - CVE-2026-34487 Apache Tomcat: Apache Tomcat: Information disclosure via sensitive data in log files
• BZ - 2457039 - CVE-2026-25854 Apache Tomcat: Apache Tomcat: Open Redirect vulnerability via LoadBalancerDrainingValve
• BZ - 2457040 - CVE-2026-24880 Apache Tomcat: Apache Tomcat: HTTP Request/Response Smuggling via invalid chunk extension
• BZ - 2457043 - CVE-2026-34500 Apache Tomcat: Apache Tomcat: Authentication bypass via client certificate misconfiguration
• BZ - 2457044 - CVE-2026-34483 Apache Tomcat: Apache Tomcat: Information disclosure due to improper encoding in JsonAccessLogValve

CVEs

• CVE-2025-66614
• CVE-2026-24733
• CVE-2026-24734
• CVE-2026-24880
• CVE-2026-25854
• CVE-2026-29145
• CVE-2026-34483
• CVE-2026-34487
• CVE-2026-34500

References

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