CVE-2026-55955
Fixed in a distro release EPSS <1%CVSS 6.5
Improper Authentication vulnerability in Apache Tomcat allowed a replay attack against the EncryptionInterceptor in the cluster component. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.22, from 10.1.0-M1 through 10.1.55, from 9.0.13 through 9.0.18, from 8.5.38 through 8.5.100, from 7.0.100 through 7.0.109. Users are recommended to upgrade to version 11.0.23, 10.1.56, 9.0.119, which fixes the issue.
Products: Apache Software Foundation Apache Tomcat
Distro releases
| Release | Package | Fixed in |
|---|---|---|
| Debian 12 | tomcat10 | no fix |
| Debian 12 | tomcat9 | 9.0.70-2 |
| Debian 13 | tomcat10 | no fix |
| Debian 13 | tomcat11 | no fix |
| Debian 13 | tomcat9 | 9.0.70-2 |
| Debian 14 | tomcat10 | 10.1.60-1 |
| Debian 14 | tomcat11 | 11.0.24-1 |
| Debian 14 | tomcat9 | 9.0.70-2 |
| Red Hat Enterprise Linux 10.2 | tomcat9 | 1:9.0.120-1.el10_2 |
| Red Hat Enterprise Linux 10.2 | tomcat9-admin-webapps | 1:9.0.120-1.el10_2 |
| Red Hat Enterprise Linux 10.2 | tomcat9-docs-webapp | 1:9.0.120-1.el10_2 |
| Red Hat Enterprise Linux 10.2 | tomcat9-el-3.0-api | 1:9.0.120-1.el10_2 |
| Red Hat Enterprise Linux 10.2 | tomcat9-jsp-2.3-api | 1:9.0.120-1.el10_2 |
| Red Hat Enterprise Linux 10.2 | tomcat9-lib | 1:9.0.120-1.el10_2 |
| Red Hat Enterprise Linux 10.2 | tomcat9-servlet-4.0-api | 1:9.0.120-1.el10_2 |
| Red Hat Enterprise Linux 10.2 | tomcat9-webapps | 1:9.0.120-1.el10_2 |
| Red Hat Enterprise Linux 8 | tomcat | 1:9.0.120-1.el8_10 |
| Red Hat Enterprise Linux 8 | tomcat-admin-webapps | 1:9.0.120-1.el8_10 |
| Red Hat Enterprise Linux 8 | tomcat-docs-webapp | 1:9.0.120-1.el8_10 |
| Red Hat Enterprise Linux 8 | tomcat-el-3.0-api | 1:9.0.120-1.el8_10 |
| Red Hat Enterprise Linux 8 | tomcat-jsp-2.3-api | 1:9.0.120-1.el8_10 |
| Red Hat Enterprise Linux 8 | tomcat-lib | 1:9.0.120-1.el8_10 |
| Red Hat Enterprise Linux 8 | tomcat-servlet-4.0-api | 1:9.0.120-1.el8_10 |
| Red Hat Enterprise Linux 8 | tomcat-webapps | 1:9.0.120-1.el8_10 |
| Red Hat Enterprise Linux 9 | tomcat | 1:9.0.120-2.el9_8 |
| Red Hat Enterprise Linux 9 | tomcat-admin-webapps | 1:9.0.120-2.el9_8 |
| Red Hat Enterprise Linux 9 | tomcat-docs-webapp | 1:9.0.120-2.el9_8 |
| Red Hat Enterprise Linux 9 | tomcat-el-3.0-api | 1:9.0.120-2.el9_8 |
| Red Hat Enterprise Linux 9 | tomcat-jsp-2.3-api | 1:9.0.120-2.el9_8 |
| Red Hat Enterprise Linux 9 | tomcat-lib | 1:9.0.120-2.el9_8 |
| Red Hat Enterprise Linux 9 | tomcat-servlet-4.0-api | 1:9.0.120-2.el9_8 |
| Red Hat Enterprise Linux 9 | tomcat-webapps | 1:9.0.120-2.el9_8 |
| Red Hat Enterprise Linux eus 10.0 | tomcat9 | 1:9.0.120-1.el10_0 |
| Red Hat Enterprise Linux eus 10.0 | tomcat9-admin-webapps | 1:9.0.120-1.el10_0 |
| Red Hat Enterprise Linux eus 10.0 | tomcat9-docs-webapp | 1:9.0.120-1.el10_0 |
| Red Hat Enterprise Linux eus 10.0 | tomcat9-el-3.0-api | 1:9.0.120-1.el10_0 |
| Red Hat Enterprise Linux eus 10.0 | tomcat9-jsp-2.3-api | 1:9.0.120-1.el10_0 |
| Red Hat Enterprise Linux eus 10.0 | tomcat9-lib | 1:9.0.120-1.el10_0 |
| Red Hat Enterprise Linux eus 10.0 | tomcat9-servlet-4.0-api | 1:9.0.120-1.el10_0 |
| Red Hat Enterprise Linux eus 10.0 | tomcat9-webapps | 1:9.0.120-1.el10_0 |
| Red Hat hummingbird 1 | tomcat10 | 0:10.1.56-1.hum1 |
| Red Hat hummingbird 1 | tomcat10-admin-webapps | 0:10.1.56-1.hum1 |
| Red Hat hummingbird 1 | tomcat10-common | 0:10.1.56-1.hum1 |
| Red Hat hummingbird 1 | tomcat10-docs-webapp | 0:10.1.56-1.hum1 |
| Red Hat hummingbird 1 | tomcat10-el-5.0-api | 0:10.1.56-1.hum1 |
| Red Hat hummingbird 1 | tomcat10-jsp-3.1-api | 0:10.1.56-1.hum1 |
| Red Hat hummingbird 1 | tomcat10-lib | 0:10.1.56-1.hum1 |
| Red Hat hummingbird 1 | tomcat10-servlet-6.0-api | 0:10.1.56-1.hum1 |
| Red Hat hummingbird 1 | tomcat10-user-instance | 0:10.1.56-1.hum1 |
| Red Hat hummingbird 1 | tomcat10-webapps | 0:10.1.56-1.hum1 |
| Red Hat hummingbird 1 | tomcat11 | 0:11.0.23-0.1.hum1 |
| Red Hat hummingbird 1 | tomcat11-admin-webapps | 0:11.0.23-0.1.hum1 |
| Red Hat hummingbird 1 | tomcat11-common | 0:11.0.23-0.1.hum1 |
| Red Hat hummingbird 1 | tomcat11-docs-webapp | 0:11.0.23-0.1.hum1 |
| Red Hat hummingbird 1 | tomcat11-el-6.0-api | 0:11.0.23-0.1.hum1 |
| Red Hat hummingbird 1 | tomcat11-jsp-4.0-api | 0:11.0.23-0.1.hum1 |
| Red Hat hummingbird 1 | tomcat11-lib | 0:11.0.23-0.1.hum1 |
| Red Hat hummingbird 1 | tomcat11-servlet-6.1-api | 0:11.0.23-0.1.hum1 |
| Red Hat hummingbird 1 | tomcat11-user-instance | 0:11.0.23-0.1.hum1 |
| Red Hat hummingbird 1 | tomcat11-webapps | 0:11.0.23-0.1.hum1 |
| Red Hat rhel e4s 8.8 | tomcat | 1:9.0.120-1.el8_8 |
| Red Hat rhel e4s 8.8 | tomcat-admin-webapps | 1:9.0.120-1.el8_8 |
| Red Hat rhel e4s 8.8 | tomcat-docs-webapp | 1:9.0.120-1.el8_8 |
| Red Hat rhel e4s 8.8 | tomcat-el-3.0-api | 1:9.0.120-1.el8_8 |
| Red Hat rhel e4s 8.8 | tomcat-jsp-2.3-api | 1:9.0.120-1.el8_8 |
| Red Hat rhel e4s 8.8 | tomcat-lib | 1:9.0.120-1.el8_8 |
| Red Hat rhel e4s 8.8 | tomcat-servlet-4.0-api | 1:9.0.120-1.el8_8 |
| Red Hat rhel e4s 8.8 | tomcat-webapps | 1:9.0.120-1.el8_8 |
| Red Hat rhel e4s 9.2 | tomcat | 1:9.0.120-1.el9_2 |
| Red Hat rhel e4s 9.2 | tomcat-admin-webapps | 1:9.0.120-1.el9_2 |
| Red Hat rhel e4s 9.2 | tomcat-docs-webapp | 1:9.0.120-1.el9_2 |
| Red Hat rhel e4s 9.2 | tomcat-el-3.0-api | 1:9.0.120-1.el9_2 |
| Red Hat rhel e4s 9.2 | tomcat-jsp-2.3-api | 1:9.0.120-1.el9_2 |
| Red Hat rhel e4s 9.2 | tomcat-lib | 1:9.0.120-1.el9_2 |
| Red Hat rhel e4s 9.2 | tomcat-servlet-4.0-api | 1:9.0.120-1.el9_2 |
| Red Hat rhel e4s 9.2 | tomcat-webapps | 1:9.0.120-1.el9_2 |
| Red Hat rhel e4s 9.4 | tomcat | 1:9.0.120-1.el9_4 |
| Red Hat rhel e4s 9.4 | tomcat-admin-webapps | 1:9.0.120-1.el9_4 |
| Red Hat rhel e4s 9.4 | tomcat-docs-webapp | 1:9.0.120-1.el9_4 |
| Red Hat rhel e4s 9.4 | tomcat-el-3.0-api | 1:9.0.120-1.el9_4 |
| Red Hat rhel e4s 9.4 | tomcat-jsp-2.3-api | 1:9.0.120-1.el9_4 |
| Red Hat rhel e4s 9.4 | tomcat-lib | 1:9.0.120-1.el9_4 |
| Red Hat rhel e4s 9.4 | tomcat-servlet-4.0-api | 1:9.0.120-1.el9_4 |
| Red Hat rhel e4s 9.4 | tomcat-webapps | 1:9.0.120-1.el9_4 |
| Red Hat rhel eus 9.6 | tomcat | 1:9.0.120-1.el9_6 |
| Red Hat rhel eus 9.6 | tomcat-admin-webapps | 1:9.0.120-1.el9_6 |
| Red Hat rhel eus 9.6 | tomcat-docs-webapp | 1:9.0.120-1.el9_6 |
| Red Hat rhel eus 9.6 | tomcat-el-3.0-api | 1:9.0.120-1.el9_6 |
| Red Hat rhel eus 9.6 | tomcat-jsp-2.3-api | 1:9.0.120-1.el9_6 |
| Red Hat rhel eus 9.6 | tomcat-lib | 1:9.0.120-1.el9_6 |
| Red Hat rhel eus 9.6 | tomcat-servlet-4.0-api | 1:9.0.120-1.el9_6 |
| Red Hat rhel eus 9.6 | tomcat-webapps | 1:9.0.120-1.el9_6 |
| Red Hat rhel tus 8.8 | tomcat | 1:9.0.120-1.el8_8 |
| Red Hat rhel tus 8.8 | tomcat-admin-webapps | 1:9.0.120-1.el8_8 |
| Red Hat rhel tus 8.8 | tomcat-docs-webapp | 1:9.0.120-1.el8_8 |
| Red Hat rhel tus 8.8 | tomcat-el-3.0-api | 1:9.0.120-1.el8_8 |
| Red Hat rhel tus 8.8 | tomcat-jsp-2.3-api | 1:9.0.120-1.el8_8 |
| Red Hat rhel tus 8.8 | tomcat-lib | 1:9.0.120-1.el8_8 |
| Red Hat rhel tus 8.8 | tomcat-servlet-4.0-api | 1:9.0.120-1.el8_8 |
| Red Hat rhel tus 8.8 | tomcat-webapps | 1:9.0.120-1.el8_8 |
| SUSE Linux Enterprise Module for Web and Scripting 15 SP7 | tomcat | 9.0.119-150200.111.1 |
| SUSE Linux Enterprise Module for Web and Scripting 15 SP7 | tomcat10 | 10.1.56-150200.5.70.1 |
| SUSE Linux Enterprise Module for Web and Scripting 15 SP7 | tomcat11 | 11.0.23-150600.13.24.1 |
| SUSE Linux Enterprise Server 16.0 | tomcat | 9.0.119-160000.1.1 |
| SUSE Linux Enterprise Server 16.0 | tomcat10 | 10.1.56-160000.1.1 |
| SUSE Linux Enterprise Server 16.0 | tomcat11 | 11.0.23-160000.1.1 |
| SUSE Linux Enterprise Server LTSS Extended Security 12 SP5 | tomcat | 9.0.119-3.169.1 |
| SUSE Linux Enterprise Server for SAP applications 16.0 | tomcat | 9.0.119-160000.1.1 |
| SUSE Linux Enterprise Server for SAP applications 16.0 | tomcat10 | 10.1.56-160000.1.1 |
| SUSE Linux Enterprise Server for SAP applications 16.0 | tomcat11 | 11.0.23-160000.1.1 |
| Ubuntu 24.04 LTS | tomcat10 | no fix |
| Ubuntu 24.04 LTS | tomcat9 | no fix |
| Ubuntu 25.10 | tomcat10 | no fix |
| Ubuntu 25.10 | tomcat11 | no fix |
| Ubuntu 25.10 | tomcat9 | no fix |
| Ubuntu 26.04 LTS | tomcat10 | no fix |
| Ubuntu 26.04 LTS | tomcat11 | no fix |
| Ubuntu 26.04 LTS | tomcat9 | no fix |
| Ubuntu 26.10 | tomcat10 | no fix |
| Ubuntu 26.10 | tomcat11 | no fix |
| Ubuntu 26.10 | tomcat9 | no fix |
| Ubuntu Pro 14.04 LTS | tomcat6 | no fix |
| Ubuntu Pro 14.04 LTS | tomcat7 | no fix |
| Ubuntu Pro 16.04 LTS | tomcat7 | no fix |
| Ubuntu Pro 16.04 LTS | tomcat8 | no fix |
| Ubuntu Pro 18.04 LTS | tomcat8 | no fix |
| Ubuntu Pro 18.04 LTS | tomcat9 | no fix |
| Ubuntu Pro 20.04 LTS | tomcat9 | no fix |
| Ubuntu Pro 22.04 LTS | tomcat9 | no fix |
| openSUSE Leap 16.0 | tomcat | 9.0.119-160000.1.1 |
| openSUSE Leap 16.0 | tomcat10 | 10.1.56-160000.1.1 |
| openSUSE Leap 16.0 | tomcat11 | 11.0.23-160000.1.1 |
| openSUSE Tumbleweed | tomcat | 9.0.119-1.1 |
| openSUSE Tumbleweed | tomcat10 | 10.1.56-1.1 |
| openSUSE Tumbleweed | tomcat11 | 11.0.23-1.1 |