This security update for Red Hat JBoss Web Server 6.2.3 addresses multiple vulnerabilities in the bundled Apache Tomcat component, including critical authentication bypasses (e.g., CVE-2026-29145, CVSS 9.1) and information disclosure flaws. The affected Tomcat versions, per authoritative NVD data, are Apache Tomcat 9.0.0 through 9.0.115, 10.1.0 through 10.1.52, and 11.0.0 through 11.0.19. The fix is provided by upgrading to the JBoss Web Server 6.2.3 release, which includes the patched Tomcat versions 9.0.116, 10.1.53, or 11.0.20.
Red Hat Product Errata RHSA-2026:20406 - Security Advisory Issued: 2026-05-26 Updated: 2026-05-26 RHSA-2026:20406 - Security Advisory Overview Synopsis Important: Red Hat JBoss Web Server 6.2.3 release and security update Type/Severity Security Advisory: Important Topic Red Hat JBoss Web Server 6.2.3 zip release is now available for Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat Enterprise Linux 10, and Windows Server. 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 Red Hat JBoss Web Server is a fully integrated and certified set of components for hosting Java web applications. It is comprised of the Apache Tomcat Servlet container, JBoss HTTP Connector (mod_cluster), the PicketLink Vault extension for Apache Tomcat, and the Tomcat Native library. This release of Red Hat JBoss Web Server 6.2.3 serves as a replacement for Red Hat JBoss Web Server 6.2.2. This release includes bug fixes, enhancements and component upgrades, which are documented in the Release Notes that are linked to in the References section. Security Fix(es): tomcat: Apache Tomcat: HTTP Request/Response Smuggling via invalid chunk extension (CVE-2026-24880) tomcat: Apache Tomcat: Open Redirect vulnerability via LoadBalancerDrainingValve (CVE-2026-25854) tomcat: Apache Tomcat: Authentication bypass due to CLIENT_CERT soft fail misconfiguration (CVE-2026-29145) tomcat: Apache Tomcat: Information disclosure via Padding Oracle vulnerability in EncryptInterceptor (CVE-2026-29146) tomcat: Apache Tomcat: Information disclosure due to improper encoding in JsonAccessLogValve (CVE-2026-34483) tomcat: Apache Tomcat: Information disclosure via sensitive data in log files (CVE-2026-34487) tomcat: Apache Tomcat: Authentication bypass via client certificate misconfiguration (CVE-2026-34500) 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 Before applying the update, back up your existing Red Hat JBoss Web Server installation, including all applications and configuration files. The References section of this erratum contains a download link for the update. You must be logged in to download the update. Affected Products JBoss Enterprise Web Server Text-Only Advisories x86_64 Fixes BZ - 2457020 - CVE-2026-29146 Apache Tomcat: Apache Tomcat: Information disclosure via Padding Oracle vulnerability in EncryptInterceptor 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-2026-24880 CVE-2026-25854 CVE-2026-29145 CVE-2026-29146 CVE-2026-34483 CVE-2026-34487 CVE-2026-34500 References https://access.redhat.com/security/updates/classification/#important https://docs.redhat.com/en/documentation/red_hat_jboss_web_server/6.2/html/red_hat_jboss_web_server_6.2_service_pack_3_release_notes/index The Red Hat security contact is secalert@redhat.com . More contact details at https://access.redhat.com/security/team/contact/ .