Improper input validation in Apache Tomcat - CVE-2026-32990

Vulnerability identifier: #VU125738

CSH Severity: Medium

CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-32990

CWE-ID: CWE-20

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to bypass strict SNI checks.

The vulnerability exists due to improper input validation in SNI name and host name validation when processing TLS connections. A remote attacker can use differences in case between the SNI name and host name to bypass strict SNI checks.

Apache Tomcat
Debian Linux
SUSE Linux Enterprise Server 15 SP4
SUSE Linux Enterprise Server 15 SP5
SUSE Linux Enterprise Server 15 SP6
SUSE Linux Enterprise Server 12 SP5 LTSS Extended
SUSE Linux Enterprise Server 12 SP5
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise High Performance Computing LTSS 15
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise High Performance Computing 15
SUSE Linux Enterprise High Performance Computing ESPOS 15
SUSE Linux Enterprise Server for SAP Applications 12
SUSE Linux Enterprise Server 12
SUSE Linux Enterprise High Performance Computing 12
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for ARM 64
Red Hat Enterprise Linux Server - AUS
Red Hat Enterprise Linux for ARM 64 - Extended Update Support
Red Hat Enterprise Linux for Power, little endian - Extended Update Support
Red Hat Enterprise Linux for IBM z Systems - Extended Update Support
Red Hat Enterprise Linux for x86_64 - Extended Update Support
Web and Scripting Module
openSUSE Leap
openEuler
Db2 Developer Extension
Integration Bus for z/OS
ApplinX
IBM Watson Discovery for IBM Cloud Pak for Data
Datastax Enterprise with IBM
Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions
tomcat-help
tomcat-jsvc
tomcat
tomcat-javadoc
tomcat-webapps
tomcat-admin-webapps
tomcat-jsp-2_3-api
tomcat-servlet-4_0-api
tomcat-lib
tomcat-docs-webapp
tomcat-el-3_0-api
tomcat (Red Hat package)
tomcat9 (Red Hat package)
tomcat10-webapps
tomcat10-lib
tomcat10-el-5_0-api
tomcat10-admin-webapps
tomcat10-jsp-3_1-api
tomcat10
tomcat10-servlet-6_0-api
tomcat10 (Debian package)
tomcat11-jsp-4_0-api
tomcat11-webapps
tomcat11-embed
tomcat11-jsvc
tomcat11-lib
tomcat11-doc
tomcat11
tomcat11-docs-webapp
tomcat11-admin-webapps
tomcat11-el-6_0-api
tomcat11-servlet-6_1-api
tomcat11 (Debian package)

Install security update from vendor's website.

Apache Tomcat - addressed in versions 9.0.116, 10.1.53, 11.0.20
Db2 Developer Extension - update to 1.1.2
IBM Watson Discovery for IBM Cloud Pak for Data - update to 5.3.2
Datastax Enterprise with IBM - update to 6.9.22
tomcat-help - update to 9.0.117-1
tomcat-jsvc - update to 9.0.117-1
tomcat - update to 9.0.117-1
tomcat-javadoc - update to 9.0.117-3.163.2
tomcat-webapps - addressed in versions 9.0.117-3.163.2, 9.0.117-150200.105.1
tomcat-admin-webapps - addressed in versions 9.0.117-3.163.2, 9.0.117-150200.105.1
tomcat-jsp-2_3-api - addressed in versions 9.0.117-3.163.2, 9.0.117-150200.105.1
tomcat-servlet-4_0-api - addressed in versions 9.0.117-3.163.2, 9.0.117-150200.105.1
tomcat - addressed in versions 9.0.117-3.163.2, 9.0.117-150200.105.1
tomcat-lib - addressed in versions 9.0.117-3.163.2, 9.0.117-150200.105.1
tomcat-docs-webapp - update to 9.0.117-3.163.2
tomcat-el-3_0-api - addressed in versions 9.0.117-3.163.2, 9.0.117-150200.105.1
tomcat (Red Hat package) - addressed in versions 9.0.120-1.el9_2, 9.0.120-1.el9_4, 9.0.120-2.el9_8, 10.1.49-1.el10_0, 10.1.49-4.el10_2
tomcat9 (Red Hat package) - update to 9.0.120-1.el10_2
tomcat10-webapps - update to 10.1.54-150200.5.64.1
tomcat10-lib - update to 10.1.54-150200.5.64.1
tomcat10-el-5_0-api - update to 10.1.54-150200.5.64.1
tomcat10-admin-webapps - update to 10.1.54-150200.5.64.1
tomcat10-jsp-3_1-api - update to 10.1.54-150200.5.64.1
tomcat10 - update to 10.1.54-150200.5.64.1
tomcat10-servlet-6_0-api - update to 10.1.54-150200.5.64.1
tomcat10 (Debian package) - addressed in versions 10.1.55-1~deb12u1, 10.1.55-1~deb13u1
tomcat11-jsp-4_0-api - update to 11.0.21-150600.13.18.1
tomcat11-webapps - update to 11.0.21-150600.13.18.1
tomcat11-embed - update to 11.0.21-150600.13.18.1
tomcat11-jsvc - update to 11.0.21-150600.13.18.1
tomcat11-lib - update to 11.0.21-150600.13.18.1
tomcat11-doc - update to 11.0.21-150600.13.18.1
tomcat11 - update to 11.0.21-150600.13.18.1
tomcat11-docs-webapp - update to 11.0.21-150600.13.18.1
tomcat11-admin-webapps - update to 11.0.21-150600.13.18.1
tomcat11-el-6_0-api - update to 11.0.21-150600.13.18.1
tomcat11-servlet-6_1-api - update to 11.0.21-150600.13.18.1
tomcat11 (Debian package) - update to 11.0.22-1~deb13u1

• https://tomcat.apache.org/security-11.html#Fixed_in_Apache_Tomcat_11.0.20
• https://tomcat.apache.org/security-10.html#Fixed_in_Apache_Tomcat_10.1.53
• https://tomcat.apache.org/security-9.html#Fixed_in_Apache_Tomcat_9.0.116
• https://lists.apache.org/thread/jopv52sgm698y6qc180rpphfn9kkvxn2

• Multiple vulnerabilities in Apache Tomcat (March 2026 release)
• openEuler update for tomcat
• SUSE update for tomcat11
• SUSE update for tomcat
• SUSE update for tomcat10
• SUSE update for tomcat
• Multiple vulnerabilities in IBM Watson Discovery Cartridge
• Multiple vulnerabilities in IBM Integration Bus for z/OS
• Multiple vulnerabilities in IBM DataStax Enterprise
• Debian update for tomcat11
• Debian update for tomcat10
• Multiple vulnerabilities in IBM ApplinX
• Multiple vulnerabilities in IBM Db2 Developer Extension
• Red Hat Enterprise Linux 10 update for tomcat
• Red Hat Enterprise Linux 10 update for tomcat9
• Red Hat Enterprise Linux 9 update for tomcat
• Red Hat Enterprise Linux 9 update for tomcat
• Red Hat Enterprise Linux 9 update for tomcat
• Red Hat Enterprise Linux 10 update for tomcat