Memory leak in Apache Tomcat - CVE-2026-68763

Vulnerability identifier: #VU145387

CSH Severity: Medium

CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-68763

CWE-ID: CWE-401

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to an allocation leak in HTTP/2 backlog tracking when processing a reset stream. A remote attacker can reset a stream to cause a denial of service.

Apache Tomcat
SUSE Linux Enterprise Server 12 SP5 LTSS Extended
SUSE Linux Enterprise Server 12 SP5
SUSE Linux Enterprise Server 15 SP4
SUSE Linux Enterprise Server 15 SP5
SUSE Linux Enterprise Server 15 SP6
SUSE Linux Enterprise High Performance Computing 15
SUSE Linux Enterprise High Performance Computing ESPOS 15
SUSE Linux Enterprise High Performance Computing LTSS 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise High Performance Computing 12
SUSE Linux Enterprise Server 12
SUSE Linux Enterprise Server for SAP Applications 12
Web and Scripting Module
Jira Software Data Center
Bamboo Data Center
Jira Service Management Data Center
ApplinX
tomcat-servlet-4_0-api
tomcat-lib
tomcat
tomcat-admin-webapps
tomcat-docs-webapp
tomcat-webapps
tomcat-javadoc
tomcat-el-3_0-api
tomcat-jsp-2_3-api

Install security update from vendor's website.

Apache Tomcat - addressed in versions 9.0.121, 10.1.59, 11.0.25
Jira Software Data Center - addressed in versions 9.12.39, 10.3.25, 11.3.11
Bamboo Data Center - addressed in versions 10.2.22, 12.1.11
Jira Service Management Data Center - addressed in versions 10.3.25, 11.3.11
tomcat-servlet-4_0-api - addressed in versions 9.0.121-3.177.3, 9.0.121-150200.120.1
tomcat-lib - addressed in versions 9.0.121-3.177.3, 9.0.121-150200.120.1
tomcat - addressed in versions 9.0.121-3.177.3, 9.0.121-150200.120.1
tomcat-admin-webapps - addressed in versions 9.0.121-3.177.3, 9.0.121-150200.120.1
tomcat-docs-webapp - update to 9.0.121-3.177.3
tomcat-webapps - addressed in versions 9.0.121-3.177.3, 9.0.121-150200.120.1
tomcat-javadoc - update to 9.0.121-3.177.3
tomcat-el-3_0-api - addressed in versions 9.0.121-3.177.3, 9.0.121-150200.120.1
tomcat-jsp-2_3-api - addressed in versions 9.0.121-3.177.3, 9.0.121-150200.120.1

• https://lists.apache.org/api/email.lua?id=s9n55wcm58vk9orlkn7l0sb7j4xfnrgq
• https://tomcat.apache.org/security-11.html

• Multiple vulnerabilities in Apache Tomcat
• Multiple vulnerabilities in Bamboo Data Center
• Multiple vulnerabilities in Jira Service Management Data Center
• Multiple vulnerabilities in Jira Software Data Center
• SUSE update for tomcat
• SUSE update for tomcat
• Multiple vulnerabilities in IBM ApplinX