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A critical authentication bypass vulnerability (CVE-2026-43512) exists in Apache Tomcat's digest authentication mechanism. This flaw allows remote attackers to bypass authentication restrictions. The issue affects multiple Tomcat versions from 6.0.37 through 11.0.21, including several Ubuntu package versions. Official patches are available in Tomcat versions 11.0.22, 10.1.55, and 9.0.118, and corresponding Ubuntu package updates have been released. Users are advised to update and restart Tomcat to apply the fixes.

CVE-2026-43512 is an authentication bypass vulnerability in Apache Tomcat's digest authentication implementation. The flaw allows remote attackers to bypass authentication controls, potentially gaining unauthorized access. The vulnerability affects Tomcat versions from 11.0.0 through 11.0.21, 10.1.0 through 10.1.54, 9.0.0 through 9.0.117, 8.5.0 through 8.5.100, and versions before 7.0.0. Ubuntu has released security advisories (USN-8383-1, USN-8417-1) detailing the issue and providing patched package versions. The vulnerability is marked critical due to the potential for unauthorized access. Users should upgrade to fixed versions 11.0.22, 10.1.55, or 9.0.118 and restart Tomcat to mitigate the risk.

Detailed information about UBUNTU-CVE-2026-43512 affecting null tomcat6. Get real-time updates, technical details, and mitigation strategies.

UBUNTU-CVE-2026-43512 - Live Threat Intelligence - Threat Radar | OffSeq.com

Apache Tomcat: Digest authenticator will authenticate any unknown user (CVE-2026-43512)

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