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Apache Tomcat contains an improper authorization vulnerability when multiple method constraints define the same HTTP method for a given extension. This flaw affects multiple versions of Tomcat across major release lines, allowing a remote attacker to potentially bypass authorization restrictions. The issue is addressed in Tomcat versions 11.0.22, 10.1.55, and 9.0.118. Ubuntu has released security advisories with fixes available for supported releases. Users should update to the fixed versions and restart Tomcat to apply the changes.

CVE-2026-43515 is an improper authorization vulnerability in Apache Tomcat that occurs when multiple method constraints define the same HTTP method for the same extension, leading to incorrect enforcement of security constraints. This can allow remote attackers to bypass authorization restrictions. The vulnerability affects Apache Tomcat versions from 7.0.0 through 7.0.109, 8.5.0 through 8.5.100, 9.0.0 through 9.0.117, 10.1.0 through 10.1.54, and 11.0.0 through 11.0.21. Ubuntu security advisories USN-8383-1 and USN-8417-1 confirm the issue and provide fixed package versions. The vulnerability is rated critical due to its potential to bypass authorization controls.

Detailed information about UBUNTU-CVE-2026-43515 affecting null tomcat6. Get real-time updates, technical details, and mitigation strategies.

UBUNTU-CVE-2026-43515 - Live Threat Intelligence - Threat Radar | OffSeq.com

Apache Tomcat: Security constraints not correctly applied (CVE-2026-43515)

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