CVE-2026-55957
Fixed in a distro release EPSS 3%CVSS 7.3
Missing Critical Step in Authentication vulnerability in Apache Tomcat when the JNDIRealm was configured to authenticate binds using GSSAPI allowed attackers to authenticate without provided the correct password. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.4, from 10.1.0-M1 through 10.1.36, from 9.0.0.M1 through 9.0.100, from 8.5.0 through 8.5.100, from 7.0.0 through 7.0.109. Users are recommended to upgrade to version 11.0.5, 10.1.37 or 9.0.101, which fixes the issue.
Products: Apache Software Foundation Apache Tomcat
Distro releases
| Release | Package | Fixed in |
|---|---|---|
| AlmaLinux 8 | tomcat | 1:9.0.120-1.el8_10 |
| AlmaLinux 8 | tomcat-admin-webapps | 1:9.0.120-1.el8_10 |
| AlmaLinux 8 | tomcat-docs-webapp | 1:9.0.120-1.el8_10 |
| AlmaLinux 8 | tomcat-el-3.0-api | 1:9.0.120-1.el8_10 |
| AlmaLinux 8 | tomcat-jsp-2.3-api | 1:9.0.120-1.el8_10 |
| AlmaLinux 8 | tomcat-lib | 1:9.0.120-1.el8_10 |
| AlmaLinux 8 | tomcat-servlet-4.0-api | 1:9.0.120-1.el8_10 |
| AlmaLinux 8 | tomcat-webapps | 1:9.0.120-1.el8_10 |
| Debian 12 | tomcat10 | 10.1.52-1~deb12u1 |
| Debian 12 | tomcat9 | 9.0.70-2 |
| Debian 13 | tomcat10 | 10.1.52-1~deb13u1 |
| Debian 13 | tomcat11 | 11.0.15-1~deb13u1 |
| Debian 13 | tomcat9 | 9.0.70-2 |
| Debian 14 | tomcat10 | 10.1.40-1 |
| Debian 14 | tomcat11 | 11.0.5-1 |
| Debian 14 | tomcat9 | 9.0.70-2 |
| Red Hat Enterprise Linux 10.2 | tomcat | 1:10.1.49-1.el10 |
| Red Hat Enterprise Linux 10.2 | tomcat-admin-webapps | 1:10.1.49-1.el10 |
| Red Hat Enterprise Linux 10.2 | tomcat-docs-webapp | 1:10.1.49-1.el10 |
| Red Hat Enterprise Linux 10.2 | tomcat-el-5.0-api | 1:10.1.49-1.el10 |
| Red Hat Enterprise Linux 10.2 | tomcat-jsp-3.1-api | 1:10.1.49-1.el10 |
| Red Hat Enterprise Linux 10.2 | tomcat-lib | 1:10.1.49-1.el10 |
| Red Hat Enterprise Linux 10.2 | tomcat-servlet-6.0-api | 1:10.1.49-1.el10 |
| Red Hat Enterprise Linux 10.2 | tomcat-webapps | 1:10.1.49-1.el10 |
| Red Hat Enterprise Linux 10.2 | tomcat9 | 1:9.0.110-2.el10_2 |
| Red Hat Enterprise Linux 10.2 | tomcat9-admin-webapps | 1:9.0.110-2.el10_2 |
| Red Hat Enterprise Linux 10.2 | tomcat9-docs-webapp | 1:9.0.110-2.el10_2 |
| Red Hat Enterprise Linux 10.2 | tomcat9-el-3.0-api | 1:9.0.110-2.el10_2 |
| Red Hat Enterprise Linux 10.2 | tomcat9-jsp-2.3-api | 1:9.0.110-2.el10_2 |
| Red Hat Enterprise Linux 10.2 | tomcat9-lib | 1:9.0.110-2.el10_2 |
| Red Hat Enterprise Linux 10.2 | tomcat9-servlet-4.0-api | 1:9.0.110-2.el10_2 |
| Red Hat Enterprise Linux 10.2 | tomcat9-webapps | 1:9.0.110-2.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 | 1:9.0.110-2.el9_8 |
| Red Hat Enterprise Linux 9 | tomcat-admin-webapps | 1:9.0.110-2.el9_8 |
| Red Hat Enterprise Linux 9 | tomcat-docs-webapp | 1:9.0.110-2.el9_8 |
| Red Hat Enterprise Linux 9 | tomcat-el-3.0-api | 1:9.0.110-2.el9_8 |
| Red Hat Enterprise Linux 9 | tomcat-jsp-2.3-api | 1:9.0.110-2.el9_8 |
| Red Hat Enterprise Linux 9 | tomcat-lib | 1:9.0.110-2.el9_8 |
| Red Hat Enterprise Linux 9 | tomcat-servlet-4.0-api | 1:9.0.110-2.el9_8 |
| Red Hat Enterprise Linux 9 | tomcat-webapps | 1:9.0.110-2.el9_8 |
| Red Hat Enterprise Linux eus 10.0 | tomcat | 1:10.1.49-1.el10_0 |
| Red Hat Enterprise Linux eus 10.0 | tomcat-admin-webapps | 1:10.1.49-1.el10_0 |
| Red Hat Enterprise Linux eus 10.0 | tomcat-docs-webapp | 1:10.1.49-1.el10_0 |
| Red Hat Enterprise Linux eus 10.0 | tomcat-el-5.0-api | 1:10.1.49-1.el10_0 |
| Red Hat Enterprise Linux eus 10.0 | tomcat-jsp-3.1-api | 1:10.1.49-1.el10_0 |
| Red Hat Enterprise Linux eus 10.0 | tomcat-lib | 1:10.1.49-1.el10_0 |
| Red Hat Enterprise Linux eus 10.0 | tomcat-servlet-6.0-api | 1:10.1.49-1.el10_0 |
| Red Hat Enterprise Linux eus 10.0 | tomcat-webapps | 1:10.1.49-1.el10_0 |
| 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 |
| Rocky Linux 8 | tomcat | 1:9.0.120-1.el8_10 |
| 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 |