CVE-2018-1336: Apache Tomcat

High severity, CVSS 7.5. EPSS: 20.4% chance of exploitation in the next 30 days.

An improper handing of overflow in the UTF-8 decoder with supplementary characters can lead to an infinite loop in the decoder causing a Denial of Service. Versions Affected: Apache Tomcat 9.0.0.M9 to 9.0.7, 8.5.0 to 8.5.30, 8.0.0.RC1 to 8.0.51, and 7.0.28 to 7.0.86.

Affected products

• Apache Tomcat: from 7.0.28, up to and including 7.0.86; from 8.0.0, up to and including 8.0.51; from 8.5.0, up to and including 8.5.30; from 9.0.1, up to and including 9.0.7; version 8.0.0 only; version 9.0.0 only
• Canonical Ubuntu Linux: version 14.04 only; version 16.04 only
• Debian Debian Linux: version 8.0 only; version 9.0 only
• Red Hat Enterprise Linux Desktop: version 7.0 only
• Red Hat Enterprise Linux Server: version 7.0 only
• Red Hat Enterprise Linux Workstation: version 7.0 only
• Red Hat JBoss Enterprise Application Platform: version 6.0.0 only; version 6.4.0 only
• Red Hat JBoss Enterprise Web Server: version 3.0.0 only; version 5.0.0 only

Published 2018-08-02. Last modified 2026-06-17.