CVE-2026-66299: tomcat from 9.0.89 (inclusive), before 9.0.121 (exclusive), from 10.1.24 (inclusive), before 10.1.58 (exclusive), from…

Affected technology

tomcat · from 9.0.89 (inclusive), before 9.0.121 (exclusive)
apache

tomcat · from 10.1.24 (inclusive), before 10.1.58 (exclusive)
apache

tomcat · from 11.0.1 (inclusive), before 11.0.25 (exclusive)
apache

tomcat · 11.0.0 · update milestone20
apache

tomcat · 11.0.0 · update milestone21
apache

tomcat · 11.0.0 · update milestone22
apache

tomcat · 11.0.0 · update milestone23
apache

tomcat · 11.0.0 · update milestone24
apache

tomcat · 11.0.0 · update milestone25
apache

tomcat · 11.0.0 · update milestone26
apache

Apache Tomcat · 11.0.0-M20 through 11.0.24, 10.1.24 through 10.1.57, 9.0.89 through 9.0.120
Apache Software Foundation

Component: Not specified by the source

Attack conditions (NVD, CVSS 3.1): Network (remote) · No privileges required · No user interaction required

Attack conditions (Source advisory, CVSS 3.1): Network (remote) · No privileges required · No user interaction required

What an attacker can do

NVD’s CVSS 3.1 assessment (base score 5.3/10) rates confidentiality and integrity impact as none; availability impact as low. Source advisory’s CVSS 3.1 assessment (base score 7.5/10) rates confidentiality and integrity impact as none; availability impact as high. The description does not specify what an attacker can achieve beyond these rated impacts.