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A vulnerability in Apache Tomcat's JNDIRealm component allows authentication bypass when configured to use GSSAPI authenticated binds. This flaw permits attackers to authenticate without providing the correct password. The issue affects multiple versions across Tomcat 7, 8.5, 9, 10.1, and 11 branches. Fixed versions include 11.0.5, 10.1.37, and 9.0.101. Users are advised to upgrade to these fixed versions to mitigate the risk.

CVE-2026-55957 is an authentication bypass vulnerability in Apache Tomcat when the JNDIRealm is configured to authenticate binds using GSSAPI. Due to a missing critical step in the authentication process, attackers can bypass password verification and gain unauthorized access. This affects Tomcat versions from 7.0.0 through 7.0.109, 8.5.0 through 8.5.100, 9.0.0 through 9.0.100, 10.1.0 through 10.1.36, and 11.0.0 through 11.0.4. The issue is resolved in versions 11.0.5, 10.1.37, and 9.0.101.

Detailed information about UBUNTU-CVE-2026-55957 affecting null tomcat6. Get real-time updates, technical details, and mitigation strategies.

UBUNTU-CVE-2026-55957 - Live Threat Intelligence - Threat Radar | OffSeq.com

Apache Tomcat: Authentication bypass with JNDIRealm and GSSAPI authenticated bind (CVE-2026-55957)

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