CVE-2026-55957

A flaw was found in Apache Tomcat. When the JNDIRealm was configured to authenticate binds using GSSAPI, an attacker could exploit a missing critical step in the authentication process. This allowed the attacker to bypass password verification and authenticate without providing the correct password, leading to unauthorized access.

This issue is rated as Important severity because it allows an attacker to fully bypass password verification when authenticating against a Tomcat instance, potentially gaining unauthorized access to protected resources without any privileges or user interaction required.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update the affected package as soon as possible.