RHSA-2026:68677 - Security Advisory

Topic

An update for tomcat is now available for Red Hat Enterprise Linux 8.

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-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: Authentication bypass via missing critical step in JNDIRealm GSSAPI configuration (CVE-2026-55957)
• 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 8 x86_64
• Red Hat Enterprise Linux for IBM z Systems 8 s390x
• Red Hat Enterprise Linux for Power, little endian 8 ppc64le
• Red Hat Enterprise Linux for ARM 64 8 aarch64
• Red Hat Enterprise Linux for x86_64 - Extended Life Cycle 8.10 x86_64
• Red Hat Enterprise Linux for ARM 64 - Extended Life Cycle 8.10 aarch64
• Red Hat Enterprise Linux for Power, little endian - Extended Life Cycle 8.10 ppc64le
• Red Hat Enterprise Linux for IBM z Systems - Extended Life Cycle 8.10 s390x

Fixes

• 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 - 2494669 - CVE-2026-55957 tomcat: Apache Tomcat: Authentication bypass via missing critical step in JNDIRealm GSSAPI configuration
• 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-2026-41293
• CVE-2026-42498
• CVE-2026-43512
• CVE-2026-43513
• CVE-2026-43515
• CVE-2026-55957
• CVE-2026-59083
• CVE-2026-59084

References

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