Uncontrolled Resource Consumption vulnerability in Apache Tomcat if an HTTP/2 client did not acknowledge the initial settings frame that reduces the maximum permitted concurrent streams.
This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.8, from 10.1.0-M1 through 10.1.42, from 9.0.0.M1 through 9.0.106. The following versions were EOL at the time the CVE was created but are known to be affected: 8.5.0 through 8.5.100. Other EOL versions may also be affected.
Users are recommended to upgrade to version 11.0.9, 10.1.43 or 9.0.107, which fix the issue.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alma_linux | — | Upgrade tomcat-jsp-2.3-apiUpgrade tomcatUpgrade tomcat-servlet-4.0-apiUpgrade tomcat-webappsUpgrade tomcat-docs-webappUpgrade tomcat-el-3.0-apiUpgrade tomcat-admin-webappsUpgrade tomcat-lib | Aug 22, 2025 | Aug 20, 2025 |
| Amazon Linux Ami 2 | — | Upgrade tomcatUpgrade tomcat-admin-webappsUpgrade tomcat-el-3.0-apiUpgrade tomcat-servlet-4.0-apiUpgrade tomcat-docs-webappUpgrade tomcat-jsp-2.3-apiUpgrade tomcat-webappsUpgrade tomcat-jsvcUpgrade tomcat-lib | May 20, 2026 | May 20, 2026 |
| Apache Tomcat | — | Upgrade Apache Tomcat to the latest available versionUpgrade Apache Tomcat to 11.0.9Upgrade Apache Tomcat to 10.1.43Upgrade Apache Tomcat to 9.0.107 | Jul 10, 2025 | Jul 10, 2025 |
| Atlassian Bitbucket | — | Upgrade Atlassian Bitbucket to the latest version | Aug 20, 2025 | Aug 19, 2025 |
| Atlassian Jira | — | Upgrade to the latest version of Atlassian JIRA | Sep 17, 2025 | Sep 16, 2025 |
| Debian | — | Upgrade tomcat9Upgrade tomcat11Upgrade tomcat10 | Jul 14, 2025 | Jul 10, 2025 |
| Freebsd | — | Upgrade tomcat9Upgrade tomcat110Upgrade tomcat101 | Jul 12, 2025 | Jul 10, 2025 |
| Oracle_linux | — | Upgrade tomcat-el-3.0-apiUpgrade tomcat-webappsUpgrade tomcat-jsp-3.1-apiUpgrade tomcat-jsp-2.3-apiUpgrade tomcat9-webappsUpgrade tomcat9-servlet-4.0-apiUpgrade tomcat9-libUpgrade tomcat9Upgrade tomcat-servlet-6.0-apiUpgrade tomcat-admin-webappsUpgrade tomcat-el-5.0-apiUpgrade tomcat9-el-3.0-apiUpgrade tomcat9-jsp-2.3-apiUpgrade tomcat9-admin-webappsUpgrade tomcat-libUpgrade tomcat-docs-webappUpgrade tomcat9-docs-webappUpgrade tomcat-servlet-4.0-apiUpgrade tomcat | Aug 21, 2025 | Jul 10, 2025 |
| Redhat_linux | — | Upgrade tomcat-servlet-6.0-apiUpgrade tomcat9-webappsUpgrade tomcat9-libUpgrade jws6-tomcat-admin-webappsUpgrade tomcat-jsp-2.3-apiUpgrade tomcat-servlet-4.0-apiUpgrade tomcat-webappsUpgrade jws6-tomcat-el-5.0-apiUpgrade tomcat9-docs-webappUpgrade tomcat-docs-webappUpgrade jws6-tomcat-jsp-3.1-apiUpgrade jws6-tomcat-selinuxUpgrade tomcat-el-3.0-apiUpgrade tomcatNo solution existsUpgrade tomcat9-servlet-4.0-apiUpgrade jws6-tomcat-libUpgrade tomcat-admin-webappsUpgrade tomcat-jsp-3.1-apiUpgrade tomcat-el-5.0-apiUpgrade tomcat9-el-3.0-apiUpgrade jws6-tomcat-javadocUpgrade tomcat9Upgrade tomcat9-jsp-2.3-apiUpgrade tomcat-libUpgrade jws6-tomcatUpgrade tomcat9-admin-webappsUpgrade jws6-tomcat-docs-webappUpgrade jws6-tomcat-servlet-6.0-apiUpgrade jws6-tomcat-webapps | Jul 14, 2025 | Jul 10, 2025 |
| Suse | — | Upgrade tomcat10-embedUpgrade tomcat11-libUpgrade tomcat-javadocUpgrade tomcat10-docUpgrade tomcat11-jsp-4_0-apiUpgrade tomcat11-docs-webappUpgrade tomcat11-webappsUpgrade tomcat10-admin-webappsUpgrade tomcat-admin-webappsUpgrade tomcat11Upgrade tomcat10-servlet-6_0-apiUpgrade tomcat11-servlet-6_1-apiUpgrade tomcat-libUpgrade tomcat10-libUpgrade tomcat-embedUpgrade tomcat10-docs-webappUpgrade tomcat10-jsvcUpgrade tomcat10-jsp-3_1-apiUpgrade tomcat-docs-webappUpgrade tomcat11-docUpgrade tomcat10Upgrade tomcat-el-3_0-apiUpgrade tomcatUpgrade tomcat11-admin-webappsUpgrade tomcat10-webappsUpgrade tomcat-servlet-4_0-apiUpgrade tomcat11-el-6_0-apiUpgrade tomcat11-jsvcUpgrade tomcat10-el-5_0-apiUpgrade tomcat-jsp-2_3-apiUpgrade tomcat-webappsUpgrade tomcat11-embedUpgrade tomcat-jsvc | Dec 5, 2025 | Aug 27, 2025 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Aug 6, 2025 | Jul 10, 2025 |
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