CVE-2026-66299

Tomcat is the servlet container that is used in the official Reference Implementation for the Java Servlet and JavaServer Pages technologies. The Java Servlet and JavaServer Pages specifications are developed by Sun under the Java Community Process.

Security Fix(es):

Uncontrolled Resource Consumption vulnerability in Apache Tomcat's WebSocket chat example. This issue affects Apache Tomcat: from 11.0.0-M20 through 11.0.24, from 10.1.24 through 10.1.57, from 9.0.89 through 9.0.120. Users who have followed the security guidance to remove the examples web application are not affected by this issue.(CVE-2026-66299)

Uncontrolled Resource Consumption vulnerability in Apache Tomcat's WebSocket chat example. This issue affects Apache Tomcat: from 11.0.0-M20 through 11.0.24, from 10.1.24 through 10.1.57, from 9.0.89 through 9.0.120. Users who have followed the security guidance to remove the examples web application are not affected by this issue. Users are recommended to remove the examples web application or to upgrade to version 11.0.25, 10.1.58 or 9.0.121 (when released), which fix the issue.

Uncontrolled Resource Consumption vulnerability in Apache Tomcat's WebSocket chat example.

This issue affects Apache Tomcat: from 11.0.0 through 11.0.24, from 10.1.24 through 10.1.57, from 9.0.89 through 9.0.120. Users who have followed the security guidance to remove the examples web application are not affected by this issue.

Users are recommended to remove the examples web application or to upgrade to version 11.0.25, 10.1.58 or 9.0.121 (when released), which fix the issue.

Incorrect URL decoding in RewriteValve may allow security control bypass. (CVE-2026-59083) EncryptInterceptor requirements not clearly documented. (CVE-2026-59084) DoS via WebSocket chat example. (CVE-2026-66299) Bypass longest prefix security constraint. (CVE-2026-65182) TOCTOU when setting specific permissions for Unix Domain Sockets. (CVE-2026-65183) HTTP/2 no-authority bypass of strict SNI validation - CVE-2026-32990 fix incomplete. (CVE-2026-65637) Limited replay attack possible with DIGEST authentication. (CVE-2026-65905) RewriteValve [N] restarts at the second rule and may bypass access control. (CVE-2026-65927) Servlet role references can bypass declarative role constraints. (CVE-2026-66422) Redirect after FORM auth may bypass method specific constraints. (CVE-2026-68525) Principal lookup can fail open in some cases. (CVE-2026-68569) DoS via allocation leak in HTTP/2 backlog tracking when a stream is reset. (CVE-2026-68763) Authenticated WebSocket session survives end of HTTP session. (CVE-2026-73180)

These are all security issues fixed in the tomcat-9.0.121-1.1 package on the GA media of openSUSE Tumbleweed.

These are all security issues fixed in the tomcat10-10.1.59-1.1 package on the GA media of openSUSE Tumbleweed.

These are all security issues fixed in the tomcat11-11.0.25-1.1 package on the GA media of openSUSE Tumbleweed.

This update for tomcat10 fixes the following issues:

• CVE-2026-65182: Bypass longest prefix security constraint (bsc#1276893).
• CVE-2026-65183: TOCTOU when setting specific permissions for Unix Domain Sockets (bsc#1276894).
• CVE-2026-65637: HTTP/2 no-authority bypass of strict SNI validation - fix incomplete (bsc#1276895).
• CVE-2026-65905: Limited replay attack possible with DIGEST authentication (bsc#1276896).
• CVE-2026-65927: RewriteValve [N] restarts at the second rule and may bypass access control (bsc#1276897).
• CVE-2026-66299: memory exhaustion via maliciously slow clients due to the WebSocket chat example providing an unbounded buffer for undelivered messages (bsc#1273150).
• CVE-2026-66422: Servlet role references can bypass declarative role constraints (bsc#1276898).
• CVE-2026-68525: Redirect after FORM auth may bypass method specific constraints (bsc#1276899).
• CVE-2026-68569: Principal lookup can fail open in some cases (bsc#1276900).
• CVE-2026-68763: DoS via allocation leak in HTTP/2 backlog tracking when a stream is reset (bsc#1276901).
• CVE-2026-73180: Authenticated WebSocket session survives end of HTTP session (bsc#1276902).

Changes for tomcat10:

• Update to Tomcat 10.1.59

• Catalina

• Fix: Ensure that a login-config conflict when merging web.xml fragments triggers a deployment failure. (markt)
• Code: Remove unnecessary calls to String.intern() in the parsing of configuration files. (markt)
• Fix: Extend sessionAttributeValueClassNameFilter to include filtering of dynamic proxy interface classes. (markt)
• Fix: Attempt to use rollback when persisting user data to the DataSourceUserDatabase fails and improve error reporting. (remm)
• Fix: 70143: Handle InvalidFileNameException when parsing parts to rethrow it as an IllegalStateException as mandated by the Servlet specification. (remm)
• Fix: Add missing reason to the JsonErrorReportValve. (remm)
• Fix: evaluation of the N and C flags for rewrite rules. (remm)
• Fix: qsd flag should always discard the original query string when rewriting. (remm)
• Fix: Add appropriate escaping for context path, current directory name and parent directory name for directory listings produced by the default servlet. Ensure XML escaping is used with XML output. (markt)
• Fix: When processing certificate subject names and issuer names within RewriteValve rules, always use the RFC 2253 format name. (markt)
• Fix: the incorrect rejection of requests using digest authentication when the client provided nonce count is at the upper boundary of the window (markt).
• Update: Separate the Context role mapping from the Servlet specification security-role-ref. (remm)
• Fix: Handle the case where the JNDIRealm is configured to perform role searches with userRoleAttribute but the attribute is not available or not configured for the current user. (markt)
• Fix: Improve handling of session attribute addition concurrent with session expiration. An application will now either see a successful addition followed by expiration or the addition will not succeed. It is no longer possible for the session to expire and the addition to succeed. This is of particular not for attributes that implement HttpSessionBindingListener. (markt)
• Fix: Add a new attribute to the Context, urlPatternsProvidedInDecodedForm. This attribute controls whether URLs and URL patterns provided in the deployment descriptor (web.xml), annotations and/or their programmatic equivalents are treated as being provided in URL-encoded form (i.e. using %nn encoding) or in decoded form. The Servlet specification requires that they are provided in decoded form. However, Tomcat has historically treated them as if they are provided in encoded form. In Tomcat 12, they will always be treated as if they are provided in decoded form. This setting enables migration from encoded form to decoded form on an application by application basis. This attribute will be removed in Tomcat 12…

This update for tomcat11 fixes the following issues:

• CVE-2026-65182: Bypass longest prefix security constraint (bsc#1276893).
• CVE-2026-65183: TOCTOU when setting specific permissions for Unix Domain Sockets (bsc#1276894).
• CVE-2026-65637: HTTP/2 no-authority bypass of strict SNI validation - fix incomplete (bsc#1276895).
• CVE-2026-65905: Limited replay attack possible with DIGEST authentication (bsc#1276896).
• CVE-2026-65927: RewriteValve [N] restarts at the second rule and may bypass access control (bsc#1276897).
• CVE-2026-66299: memory exhaustion via maliciously slow clients due to the WebSocket chat example providing an unbounded buffer for undelivered messages (bsc#1273150).
• CVE-2026-66422: Servlet role references can bypass declarative role constraints (bsc#1276898).
• CVE-2026-68525: Redirect after FORM auth may bypass method specific constraints (bsc#1276899).
• CVE-2026-68569: Principal lookup can fail open in some cases (bsc#1276900).
• CVE-2026-68763: DoS via allocation leak in HTTP/2 backlog tracking when a stream is reset (bsc#1276901).
• CVE-2026-73180: Authenticated WebSocket session survives end of HTTP session (bsc#1276902).

Changes for tomcat11:

• Update to Tomcat 11.0.25

• Catalina

• Fix: Ensure that a login-config conflict when merging web.xml fragments triggers a deployment failure. (markt)
• Code: Remove unnecessary calls to String.intern() in the parsing of configuration files. (markt)
• Fix: Extend sessionAttributeValueClassNameFilter to include filtering of dynamic proxy interface classes. (markt)
• Fix: Attempt to use rollback when persisting user data to the DataSourceUserDatabase fails and improve error reporting. (remm)
• Fix: 70143: Handle InvalidFileNameException when parsing parts to rethrow it as an IllegalStateException as mandated by the Servlet specification. (remm)
• Fix: Add missing reason to the JsonErrorReportValve. (remm)
• Fix: evaluation of the N and C flags for rewrite rules. (remm)
• Fix: qsd flag should always discard the original query string when rewriting. (remm)
• Fix: Add appropriate escaping for context path, current directory name and parent directory name for directory listings produced by the default servlet. Ensure XML escaping is used with XML output. (markt)
• Fix: When processing certificate subject names and issuer names within RewriteValve rules, always use the RFC 2253 format name. (markt)
• Fix: the incorrect rejection of requests using digest authentication when the client provided nonce count is at the upper boundary of the window (markt).
• Update: Separate the Context role mapping from the Servlet specification security-role-ref. (remm)
• Fix: Handle the case where the JNDIRealm is configured to perform role searches with userRoleAttribute but the attribute is not available or not configured for the current user. (markt)
• Fix: Improve handling of session attribute addition concurrent with session expiration. An application will now either see a successful addition followed by expiration or the addition will not succeed. It is no longer possible for the session to expire and the addition to succeed. This is of particular not for attributes that implement HttpSessionBindingListener. (markt)
• Fix: Add a new attribute to the Context, urlPatternsProvidedInDecodedForm. This attribute controls whether URLs and URL patterns provided in the deployment descriptor (web.xml), annotations and/or their programmatic equivalents are treated as being provided in URL-encoded form (i.e. using %nn encoding) or in decoded form. The Servlet specification requires that they are provided in decoded form. However, Tomcat has historically treated them as if they are provided in encoded form. In Tomcat 12, they will always be treated as if they are provided in decoded form. This setting enables migration from encoded form to decoded form on an application by application basis. This attribute will be removed in Tomcat 12 where…

This update for tomcat fixes the following issues:

• CVE-2026-65182: Bypass longest prefix security constraint (bsc#1276893).
• CVE-2026-65183: TOCTOU when setting specific permissions for Unix Domain Sockets (bsc#1276894).
• CVE-2026-65637: HTTP/2 no-authority bypass of strict SNI validation - fix incomplete (bsc#1276895).
• CVE-2026-65905: Limited replay attack possible with DIGEST authentication (bsc#1276896).
• CVE-2026-65927: RewriteValve [N] restarts at the second rule and may bypass access control (bsc#1276897).
• CVE-2026-66299: memory exhaustion via maliciously slow clients due to the WebSocket chat example providing an unbounded buffer for undelivered messages (bsc#1273150).
• CVE-2026-66422: Servlet role references can bypass declarative role constraints (bsc#1276898).
• CVE-2026-68525: Redirect after FORM auth may bypass method specific constraints (bsc#1276899).
• CVE-2026-68569: Principal lookup can fail open in some cases (bsc#1276900).
• CVE-2026-68763: DoS via allocation leak in HTTP/2 backlog tracking when a stream is reset (bsc#1276901).
• CVE-2026-73180: Authenticated WebSocket session survives end of HTTP session (bsc#1276902).

Changes for tomcat:

• Update to Tomcat 9.0.121

• Catalina

• Fix: Ensure that a login-config conflict when merging web.xml fragments triggers a deployment failure. (markt)
• Code: Remove unnecessary calls to String.intern() in the parsing of configuration files. (markt)
• Fix: Extend sessionAttributeValueClassNameFilter to include filtering of dynamic proxy interface classes. (markt)
• Fix: Attempt to use rollback when persisting user data to the DataSourceUserDatabase fails and improve error reporting. (remm)
• Fix: 70143: Handle InvalidFileNameException when parsing parts to rethrow it as an IllegalStateException as mandated by the Servlet specification. (remm)
• Fix: Add missing reason to the JsonErrorReportValve. (remm)
• Fix: evaluation of the N and C flags for rewrite rules. (remm)
• Fix: qsd flag should always discard the original query string when rewriting. (remm)
• Fix: Add appropriate escaping for context path, current directory name and parent directory name for directory listings produced by the default servlet. Ensure XML escaping is used with XML output. (markt)
• Fix: When processing certificate subject names and issuer names within RewriteValve rules, always use the RFC 2253 format name. (markt)
• Fix: the incorrect rejection of requests using digest authentication when the client provided nonce count is at the upper boundary of the window (markt).
• Update: Separate the Context role mapping from the Servlet specification security-role-ref. (remm)
• Fix: Handle the case where the JNDIRealm is configured to perform role searches with userRoleAttribute but the attribute is not available or not configured for the current user. (markt)
• Fix: Improve handling of session attribute addition concurrent with session expiration. An application will now either see a successful addition followed by expiration or the addition will not succeed. It is no longer possible for the session to expire and the addition to succeed. This is of particular not for attributes that implement HttpSessionBindingListener. (markt)
• Fix: Add a new attribute to the Context, urlPatternsProvidedInDecodedForm. This attribute controls whether URLs and URL patterns provided in the deployment descriptor (web.xml), annotations and/or their programmatic equivalents are treated as being provided in URL-encoded form (i.e. using %nn encoding) or in decoded form. The Servlet specification requires that they are provided in decoded form. However, Tomcat has historically treated them as if they are provided in encoded form. In Tomcat 12, they will always be treated as if they are provided in decoded form. This setting enables migration from encoded form to decoded form on an application by application basis. This attribute will be removed in Tomcat 12 where it…

This update for tomcat10 fixes the following issues:

• CVE-2026-65182: Bypass longest prefix security constraint (bsc#1276893).
• CVE-2026-65183: TOCTOU when setting specific permissions for Unix Domain Sockets (bsc#1276894).
• CVE-2026-65637: HTTP/2 no-authority bypass of strict SNI validation - fix incomplete (bsc#1276895).
• CVE-2026-65905: Limited replay attack possible with DIGEST authentication (bsc#1276896).
• CVE-2026-65927: RewriteValve [N] restarts at the second rule and may bypass access control (bsc#1276897).
• CVE-2026-66299: memory exhaustion via maliciously slow clients due to the WebSocket chat example providing an unbounded buffer for undelivered messages (bsc#1273150).
• CVE-2026-66422: Servlet role references can bypass declarative role constraints (bsc#1276898).
• CVE-2026-68525: Redirect after FORM auth may bypass method specific constraints (bsc#1276899).
• CVE-2026-68569: Principal lookup can fail open in some cases (bsc#1276900).
• CVE-2026-68763: DoS via allocation leak in HTTP/2 backlog tracking when a stream is reset (bsc#1276901).
• CVE-2026-73180: Authenticated WebSocket session survives end of HTTP session (bsc#1276902).

Changes for tomcat10:

• Update to Tomcat 10.1.59

• Catalina

• Fix: Ensure that a login-config conflict when merging web.xml fragments triggers a deployment failure. (markt)
• Code: Remove unnecessary calls to String.intern() in the parsing of configuration files. (markt)
• Fix: Extend sessionAttributeValueClassNameFilter to include filtering of dynamic proxy interface classes. (markt)
• Fix: Attempt to use rollback when persisting user data to the DataSourceUserDatabase fails and improve error reporting. (remm)
• Fix: 70143: Handle InvalidFileNameException when parsing parts to rethrow it as an IllegalStateException as mandated by the Servlet specification. (remm)
• Fix: Add missing reason to the JsonErrorReportValve. (remm)
• Fix: evaluation of the N and C flags for rewrite rules. (remm)
• Fix: qsd flag should always discard the original query string when rewriting. (remm)
• Fix: Add appropriate escaping for context path, current directory name and parent directory name for directory listings produced by the default servlet. Ensure XML escaping is used with XML output. (markt)
• Fix: When processing certificate subject names and issuer names within RewriteValve rules, always use the RFC 2253 format name. (markt)
• Fix: the incorrect rejection of requests using digest authentication when the client provided nonce count is at the upper boundary of the window (markt).
• Update: Separate the Context role mapping from the Servlet specification security-role-ref. (remm)
• Fix: Handle the case where the JNDIRealm is configured to perform role searches with userRoleAttribute but the attribute is not available or not configured for the current user. (markt)
• Fix: Improve handling of session attribute addition concurrent with session expiration. An application will now either see a successful addition followed by expiration or the addition will not succeed. It is no longer possible for the session to expire and the addition to succeed. This is of particular not for attributes that implement HttpSessionBindingListener. (markt)
• Fix: Add a new attribute to the Context, urlPatternsProvidedInDecodedForm. This attribute controls whether URLs and URL patterns provided in the deployment descriptor (web.xml), annotations and/or their programmatic equivalents are treated as being provided in URL-encoded form (i.e. using %nn encoding) or in decoded form. The Servlet specification requires that they are provided in decoded form. However, Tomcat has historically treated them as if they are provided in encoded form. In Tomcat 12, they will always be treated as if they are provided in decoded form. This setting enables migration from encoded form to decoded form on an application by application basis. This attribute will be removed in Tomcat 12…

This update for tomcat11 fixes the following issues:

• CVE-2026-65182: Bypass longest prefix security constraint (bsc#1276893).
• CVE-2026-65183: TOCTOU when setting specific permissions for Unix Domain Sockets (bsc#1276894).
• CVE-2026-65637: HTTP/2 no-authority bypass of strict SNI validation - fix incomplete (bsc#1276895).
• CVE-2026-65905: Limited replay attack possible with DIGEST authentication (bsc#1276896).
• CVE-2026-65927: RewriteValve [N] restarts at the second rule and may bypass access control (bsc#1276897).
• CVE-2026-66299: memory exhaustion via maliciously slow clients due to the WebSocket chat example providing an unbounded buffer for undelivered messages (bsc#1273150).
• CVE-2026-66422: Servlet role references can bypass declarative role constraints (bsc#1276898).
• CVE-2026-68525: Redirect after FORM auth may bypass method specific constraints (bsc#1276899).
• CVE-2026-68569: Principal lookup can fail open in some cases (bsc#1276900).
• CVE-2026-68763: DoS via allocation leak in HTTP/2 backlog tracking when a stream is reset (bsc#1276901).
• CVE-2026-73180: Authenticated WebSocket session survives end of HTTP session (bsc#1276902).

Changes for tomcat11:

• Update to Tomcat 11.0.25

• Catalina

• Fix: Ensure that a login-config conflict when merging web.xml fragments triggers a deployment failure. (markt)
• Code: Remove unnecessary calls to String.intern() in the parsing of configuration files. (markt)
• Fix: Extend sessionAttributeValueClassNameFilter to include filtering of dynamic proxy interface classes. (markt)
• Fix: Attempt to use rollback when persisting user data to the DataSourceUserDatabase fails and improve error reporting. (remm)
• Fix: 70143: Handle InvalidFileNameException when parsing parts to rethrow it as an IllegalStateException as mandated by the Servlet specification. (remm)
• Fix: Add missing reason to the JsonErrorReportValve. (remm)
• Fix: evaluation of the N and C flags for rewrite rules. (remm)
• Fix: qsd flag should always discard the original query string when rewriting. (remm)
• Fix: Add appropriate escaping for context path, current directory name and parent directory name for directory listings produced by the default servlet. Ensure XML escaping is used with XML output. (markt)
• Fix: When processing certificate subject names and issuer names within RewriteValve rules, always use the RFC 2253 format name. (markt)
• Fix: the incorrect rejection of requests using digest authentication when the client provided nonce count is at the upper boundary of the window (markt).
• Update: Separate the Context role mapping from the Servlet specification security-role-ref. (remm)
• Fix: Handle the case where the JNDIRealm is configured to perform role searches with userRoleAttribute but the attribute is not available or not configured for the current user. (markt)
• Fix: Improve handling of session attribute addition concurrent with session expiration. An application will now either see a successful addition followed by expiration or the addition will not succeed. It is no longer possible for the session to expire and the addition to succeed. This is of particular not for attributes that implement HttpSessionBindingListener. (markt)
• Fix: Add a new attribute to the Context, urlPatternsProvidedInDecodedForm. This attribute controls whether URLs and URL patterns provided in the deployment descriptor (web.xml), annotations and/or their programmatic equivalents are treated as being provided in URL-encoded form (i.e. using %nn encoding) or in decoded form. The Servlet specification requires that they are provided in decoded form. However, Tomcat has historically treated them as if they are provided in encoded form. In Tomcat 12, they will always be treated as if they are provided in decoded form. This setting enables migration from encoded form to decoded form on an application by application basis. This attribute will be removed in Tomcat 12 where…

This update for tomcat fixes the following issues:

• CVE-2026-65182: Bypass longest prefix security constraint (bsc#1276893).
• CVE-2026-65183: TOCTOU when setting specific permissions for Unix Domain Sockets (bsc#1276894).
• CVE-2026-65637: HTTP/2 no-authority bypass of strict SNI validation - fix incomplete (bsc#1276895).
• CVE-2026-65905: Limited replay attack possible with DIGEST authentication (bsc#1276896).
• CVE-2026-65927: RewriteValve [N] restarts at the second rule and may bypass access control (bsc#1276897).
• CVE-2026-66299: memory exhaustion via maliciously slow clients due to the WebSocket chat example providing an unbounded buffer for undelivered messages (bsc#1273150).
• CVE-2026-66422: Servlet role references can bypass declarative role constraints (bsc#1276898).
• CVE-2026-68525: Redirect after FORM auth may bypass method specific constraints (bsc#1276899).
• CVE-2026-68569: Principal lookup can fail open in some cases (bsc#1276900).
• CVE-2026-68763: DoS via allocation leak in HTTP/2 backlog tracking when a stream is reset (bsc#1276901).
• CVE-2026-73180: Authenticated WebSocket session survives end of HTTP session (bsc#1276902).

Changes for tomcat:

• Update to Tomcat 9.0.121

• Catalina

• Fix: Ensure that a login-config conflict when merging web.xml fragments triggers a deployment failure. (markt)
• Code: Remove unnecessary calls to String.intern() in the parsing of configuration files. (markt)
• Fix: Extend sessionAttributeValueClassNameFilter to include filtering of dynamic proxy interface classes. (markt)
• Fix: Attempt to use rollback when persisting user data to the DataSourceUserDatabase fails and improve error reporting. (remm)
• Fix: 70143: Handle InvalidFileNameException when parsing parts to rethrow it as an IllegalStateException as mandated by the Servlet specification. (remm)
• Fix: Add missing reason to the JsonErrorReportValve. (remm)
• Fix: evaluation of the N and C flags for rewrite rules. (remm)
• Fix: qsd flag should always discard the original query string when rewriting. (remm)
• Fix: Add appropriate escaping for context path, current directory name and parent directory name for directory listings produced by the default servlet. Ensure XML escaping is used with XML output. (markt)
• Fix: When processing certificate subject names and issuer names within RewriteValve rules, always use the RFC 2253 format name. (markt)
• Fix: the incorrect rejection of requests using digest authentication when the client provided nonce count is at the upper boundary of the window (markt).
• Update: Separate the Context role mapping from the Servlet specification security-role-ref. (remm)
• Fix: Handle the case where the JNDIRealm is configured to perform role searches with userRoleAttribute but the attribute is not available or not configured for the current user. (markt)
• Fix: Improve handling of session attribute addition concurrent with session expiration. An application will now either see a successful addition followed by expiration or the addition will not succeed. It is no longer possible for the session to expire and the addition to succeed. This is of particular not for attributes that implement HttpSessionBindingListener. (markt)
• Fix: Add a new attribute to the Context, urlPatternsProvidedInDecodedForm. This attribute controls whether URLs and URL patterns provided in the deployment descriptor (web.xml), annotations and/or their programmatic equivalents are treated as being provided in URL-encoded form (i.e. using %nn encoding) or in decoded form. The Servlet specification requires that they are provided in decoded form. However, Tomcat has historically treated them as if they are provided in encoded form. In Tomcat 12, they will always be treated as if they are provided in decoded form. This setting enables migration from encoded form to decoded form on an application by application basis. This attribute will be removed in Tomcat 12 where it…

This update for tomcat11 fixes the following issues:

• CVE-2026-65182: Bypass longest prefix security constraint (bsc#1276893).
• CVE-2026-65183: TOCTOU when setting specific permissions for Unix Domain Sockets (bsc#1276894).
• CVE-2026-65637: HTTP/2 no-authority bypass of strict SNI validation - fix incomplete (bsc#1276895).
• CVE-2026-65905: Limited replay attack possible with DIGEST authentication (bsc#1276896).
• CVE-2026-65927: RewriteValve [N] restarts at the second rule and may bypass access control (bsc#1276897).
• CVE-2026-66299: memory exhaustion via maliciously slow clients due to the WebSocket chat example providing an unbounded buffer for undelivered messages (bsc#1273150).
• CVE-2026-66422: Servlet role references can bypass declarative role constraints (bsc#1276898).
• CVE-2026-68525: Redirect after FORM auth may bypass method specific constraints (bsc#1276899).
• CVE-2026-68569: Principal lookup can fail open in some cases (bsc#1276900).
• CVE-2026-68763: DoS via allocation leak in HTTP/2 backlog tracking when a stream is reset (bsc#1276901).
• CVE-2026-73180: Authenticated WebSocket session survives end of HTTP session (bsc#1276902).

Changes for tomcat11:

• Update to Tomcat 11.0.25

• Catalina

• Fix: Ensure that a login-config conflict when merging web.xml fragments triggers a deployment failure. (markt)
• Code: Remove unnecessary calls to String.intern() in the parsing of configuration files. (markt)
• Fix: Extend sessionAttributeValueClassNameFilter to include filtering of dynamic proxy interface classes. (markt)
• Fix: Attempt to use rollback when persisting user data to the DataSourceUserDatabase fails and improve error reporting. (remm)
• Fix: 70143: Handle InvalidFileNameException when parsing parts to rethrow it as an IllegalStateException as mandated by the Servlet specification. (remm)
• Fix: Add missing reason to the JsonErrorReportValve. (remm)
• Fix: evaluation of the N and C flags for rewrite rules. (remm)
• Fix: qsd flag should always discard the original query string when rewriting. (remm)
• Fix: Add appropriate escaping for context path, current directory name and parent directory name for directory listings produced by the default servlet. Ensure XML escaping is used with XML output. (markt)
• Fix: When processing certificate subject names and issuer names within RewriteValve rules, always use the RFC 2253 format name. (markt)
• Fix: the incorrect rejection of requests using digest authentication when the client provided nonce count is at the upper boundary of the window (markt).
• Update: Separate the Context role mapping from the Servlet specification security-role-ref. (remm)
• Fix: Handle the case where the JNDIRealm is configured to perform role searches with userRoleAttribute but the attribute is not available or not configured for the current user. (markt)
• Fix: Improve handling of session attribute addition concurrent with session expiration. An application will now either see a successful addition followed by expiration or the addition will not succeed. It is no longer possible for the session to expire and the addition to succeed. This is of particular not for attributes that implement HttpSessionBindingListener. (markt)
• Fix: Add a new attribute to the Context, urlPatternsProvidedInDecodedForm. This attribute controls whether URLs and URL patterns provided in the deployment descriptor (web.xml), annotations and/or their programmatic equivalents are treated as being provided in URL-encoded form (i.e. using %nn encoding) or in decoded form. The Servlet specification requires that they are provided in decoded form. However, Tomcat has historically treated them as if they are provided in encoded form. In Tomcat 12, they will always be treated as if they are provided in decoded form. This setting enables migration from encoded form to decoded form on an application by application basis. This attribute will be removed in Tomcat 12 where…

This update for tomcat10 fixes the following issues:

• CVE-2026-65182: Bypass longest prefix security constraint (bsc#1276893).
• CVE-2026-65183: TOCTOU when setting specific permissions for Unix Domain Sockets (bsc#1276894).
• CVE-2026-65637: HTTP/2 no-authority bypass of strict SNI validation - fix incomplete (bsc#1276895).
• CVE-2026-65905: Limited replay attack possible with DIGEST authentication (bsc#1276896).
• CVE-2026-65927: RewriteValve [N] restarts at the second rule and may bypass access control (bsc#1276897).
• CVE-2026-66299: memory exhaustion via maliciously slow clients due to the WebSocket chat example providing an unbounded buffer for undelivered messages (bsc#1273150).
• CVE-2026-66422: Servlet role references can bypass declarative role constraints (bsc#1276898).
• CVE-2026-68525: Redirect after FORM auth may bypass method specific constraints (bsc#1276899).
• CVE-2026-68569: Principal lookup can fail open in some cases (bsc#1276900).
• CVE-2026-68763: DoS via allocation leak in HTTP/2 backlog tracking when a stream is reset (bsc#1276901).
• CVE-2026-73180: Authenticated WebSocket session survives end of HTTP session (bsc#1276902).

Changes for tomcat10:

• Update to Tomcat 10.1.59

• Catalina

• Fix: Ensure that a login-config conflict when merging web.xml fragments triggers a deployment failure. (markt)
• Code: Remove unnecessary calls to String.intern() in the parsing of configuration files. (markt)
• Fix: Extend sessionAttributeValueClassNameFilter to include filtering of dynamic proxy interface classes. (markt)
• Fix: Attempt to use rollback when persisting user data to the DataSourceUserDatabase fails and improve error reporting. (remm)
• Fix: 70143: Handle InvalidFileNameException when parsing parts to rethrow it as an IllegalStateException as mandated by the Servlet specification. (remm)
• Fix: Add missing reason to the JsonErrorReportValve. (remm)
• Fix: evaluation of the N and C flags for rewrite rules. (remm)
• Fix: qsd flag should always discard the original query string when rewriting. (remm)
• Fix: Add appropriate escaping for context path, current directory name and parent directory name for directory listings produced by the default servlet. Ensure XML escaping is used with XML output. (markt)
• Fix: When processing certificate subject names and issuer names within RewriteValve rules, always use the RFC 2253 format name. (markt)
• Fix: the incorrect rejection of requests using digest authentication when the client provided nonce count is at the upper boundary of the window (markt).
• Update: Separate the Context role mapping from the Servlet specification security-role-ref. (remm)
• Fix: Handle the case where the JNDIRealm is configured to perform role searches with userRoleAttribute but the attribute is not available or not configured for the current user. (markt)
• Fix: Improve handling of session attribute addition concurrent with session expiration. An application will now either see a successful addition followed by expiration or the addition will not succeed. It is no longer possible for the session to expire and the addition to succeed. This is of particular not for attributes that implement HttpSessionBindingListener. (markt)
• Fix: Add a new attribute to the Context, urlPatternsProvidedInDecodedForm. This attribute controls whether URLs and URL patterns provided in the deployment descriptor (web.xml), annotations and/or their programmatic equivalents are treated as being provided in URL-encoded form (i.e. using %nn encoding) or in decoded form. The Servlet specification requires that they are provided in decoded form. However, Tomcat has historically treated them as if they are provided in encoded form. In Tomcat 12, they will always be treated as if they are provided in decoded form. This setting enables migration from encoded form to decoded form on an application by application basis. This attribute will be removed in Tomcat 12…

This update for tomcat fixes the following issues:

• CVE-2026-65182: Bypass longest prefix security constraint (bsc#1276893).
• CVE-2026-65183: TOCTOU when setting specific permissions for Unix Domain Sockets (bsc#1276894).
• CVE-2026-65637: HTTP/2 no-authority bypass of strict SNI validation - fix incomplete (bsc#1276895).
• CVE-2026-65905: Limited replay attack possible with DIGEST authentication (bsc#1276896).
• CVE-2026-65927: RewriteValve [N] restarts at the second rule and may bypass access control (bsc#1276897).
• CVE-2026-66299: memory exhaustion via maliciously slow clients due to the WebSocket chat example providing an unbounded buffer for undelivered messages (bsc#1273150).
• CVE-2026-66422: Servlet role references can bypass declarative role constraints (bsc#1276898).
• CVE-2026-68525: Redirect after FORM auth may bypass method specific constraints (bsc#1276899).
• CVE-2026-68569: Principal lookup can fail open in some cases (bsc#1276900).
• CVE-2026-68763: DoS via allocation leak in HTTP/2 backlog tracking when a stream is reset (bsc#1276901).
• CVE-2026-73180: Authenticated WebSocket session survives end of HTTP session (bsc#1276902).

Changes for tomcat:

• Update to Tomcat 9.0.121

• Catalina

• Fix: Ensure that a login-config conflict when merging web.xml fragments triggers a deployment failure. (markt)
• Code: Remove unnecessary calls to String.intern() in the parsing of configuration files. (markt)
• Fix: Extend sessionAttributeValueClassNameFilter to include filtering of dynamic proxy interface classes. (markt)
• Fix: Attempt to use rollback when persisting user data to the DataSourceUserDatabase fails and improve error reporting. (remm)
• Fix: 70143: Handle InvalidFileNameException when parsing parts to rethrow it as an IllegalStateException as mandated by the Servlet specification. (remm)
• Fix: Add missing reason to the JsonErrorReportValve. (remm)
• Fix: evaluation of the N and C flags for rewrite rules. (remm)
• Fix: qsd flag should always discard the original query string when rewriting. (remm)
• Fix: Add appropriate escaping for context path, current directory name and parent directory name for directory listings produced by the default servlet. Ensure XML escaping is used with XML output. (markt)
• Fix: When processing certificate subject names and issuer names within RewriteValve rules, always use the RFC 2253 format name. (markt)
• Fix: the incorrect rejection of requests using digest authentication when the client provided nonce count is at the upper boundary of the window (markt).
• Update: Separate the Context role mapping from the Servlet specification security-role-ref. (remm)
• Fix: Handle the case where the JNDIRealm is configured to perform role searches with userRoleAttribute but the attribute is not available or not configured for the current user. (markt)
• Fix: Improve handling of session attribute addition concurrent with session expiration. An application will now either see a successful addition followed by expiration or the addition will not succeed. It is no longer possible for the session to expire and the addition to succeed. This is of particular not for attributes that implement HttpSessionBindingListener. (markt)
• Fix: Add a new attribute to the Context, urlPatternsProvidedInDecodedForm. This attribute controls whether URLs and URL patterns provided in the deployment descriptor (web.xml), annotations and/or their programmatic equivalents are treated as being provided in URL-encoded form (i.e. using %nn encoding) or in decoded form. The Servlet specification requires that they are provided in decoded form. However, Tomcat has historically treated them as if they are provided in encoded form. In Tomcat 12, they will always be treated as if they are provided in decoded form. This setting enables migration from encoded form to decoded form on an application by application basis. This attribute will be removed in Tomcat 12 where it…

This update for tomcat11 fixes the following issues:

• CVE-2026-65182: Apache Tomcat: Bypass longest prefix security constraint (bsc#1276893).
• CVE-2026-65183: Apache Tomcat: TOCTOU when setting specific permissions for Unix Domain Sockets (bsc#1276894).
• CVE-2026-65637: Apache Tomcat: HTTP/2 no-authority bypass of strict SNI validation - fix incomplete (bsc#1276895).
• CVE-2026-65905: Apache Tomcat: Limited replay attack possible with DIGEST authentication (bsc#1276896).
• CVE-2026-65927: Apache Tomcat: RewriteValve [N] restarts at the second rule and may bypass access control (bsc#1276897).
• CVE-2026-66299: memory exhaustion via maliciously slow clients due to the WebSocket chat example providing an unbounded buffer for undelivered messages (bsc#1273150).
• CVE-2026-66422: Apache Tomcat: Servlet role references can bypass declarative role constraints (bsc#1276898).
• CVE-2026-68525: Apache Tomcat: Redirect after FORM auth may bypass method specific constraints (bsc#1276899).
• CVE-2026-68569: Apache Tomcat: Principal lookup can fail open in some cases (bsc#1276900).
• CVE-2026-68763: Apache Tomcat: DoS via allocation leak in HTTP/2 backlog tracking when a stream is reset (bsc#1276901).
• CVE-2026-73180: Apache Tomcat: Authenticated WebSocket session survives end of HTTP session (bsc#1276902).

Changes for tomcat11:

• Updated to version 11.0.25

This update for tomcat10 fixes the following issues:

• CVE-2026-65182: Apache Tomcat: Bypass longest prefix security constraint (bsc#1276893).
• CVE-2026-65183: Apache Tomcat: TOCTOU when setting specific permissions for Unix Domain Sockets (bsc#1276894).
• CVE-2026-65637: Apache Tomcat: HTTP/2 no-authority bypass of strict SNI validation - fix incomplete (bsc#1276895).
• CVE-2026-65905: Apache Tomcat: Limited replay attack possible with DIGEST authentication (bsc#1276896).
• CVE-2026-65927: Apache Tomcat: RewriteValve [N] restarts at the second rule and may bypass access control (bsc#1276897).
• CVE-2026-66299: memory exhaustion via maliciously slow clients due to the WebSocket chat example providing an unbounded buffer for undelivered messages (bsc#1273150).
• CVE-2026-66422: Apache Tomcat: Servlet role references can bypass declarative role constraints (bsc#1276898).
• CVE-2026-68525: Apache Tomcat: Redirect after FORM auth may bypass method specific constraints (bsc#1276899).
• CVE-2026-68569: Apache Tomcat: Principal lookup can fail open in some cases (bsc#1276900).
• CVE-2026-68763: Apache Tomcat: DoS via allocation leak in HTTP/2 backlog tracking when a stream is reset (bsc#1276901).
• CVE-2026-73180: Apache Tomcat: Authenticated WebSocket session survives end of HTTP session (bsc#1276902).

Changes for tomcat10:

• Updated to version 10.1.59

This update for tomcat fixes the following issues:

• CVE-2026-65182: Apache Tomcat: Bypass longest prefix security constraint (bsc#1276893).
• CVE-2026-65183: Apache Tomcat: TOCTOU when setting specific permissions for Unix Domain Sockets (bsc#1276894).
• CVE-2026-65637: Apache Tomcat: HTTP/2 no-authority bypass of strict SNI validation - fix incomplete (bsc#1276895).
• CVE-2026-65905: Apache Tomcat: Limited replay attack possible with DIGEST authentication (bsc#1276896).
• CVE-2026-65927: Apache Tomcat: RewriteValve [N] restarts at the second rule and may bypass access control (bsc#1276897).
• CVE-2026-66299: memory exhaustion via maliciously slow clients due to the WebSocket chat example providing an unbounded buffer for undelivered messages (bsc#1273150).
• CVE-2026-66422: Apache Tomcat: Servlet role references can bypass declarative role constraints (bsc#1276898).
• CVE-2026-68525: Apache Tomcat: Redirect after FORM auth may bypass method specific constraints (bsc#1276899).
• CVE-2026-68569: Apache Tomcat: Principal lookup can fail open in some cases (bsc#1276900).
• CVE-2026-68763: Apache Tomcat: DoS via allocation leak in HTTP/2 backlog tracking when a stream is reset (bsc#1276901).
• CVE-2026-73180: Apache Tomcat: Authenticated WebSocket session survives end of HTTP session (bsc#1276902).

Changes for tomcat:

• Updated to version 9.0.121

This update for tomcat fixes the following issues:

• CVE-2026-65182: Apache Tomcat: Bypass longest prefix security constraint (bsc#1276893).
• CVE-2026-65183: Apache Tomcat: TOCTOU when setting specific permissions for Unix Domain Sockets (bsc#1276894).
• CVE-2026-65637: Apache Tomcat: HTTP/2 no-authority bypass of strict SNI validation - fix incomplete (bsc#1276895).
• CVE-2026-65905: Apache Tomcat: Limited replay attack possible with DIGEST authentication (bsc#1276896).
• CVE-2026-65927: Apache Tomcat: RewriteValve [N] restarts at the second rule and may bypass access control (bsc#1276897).
• CVE-2026-66299: memory exhaustion via maliciously slow clients due to the WebSocket chat example providing an unbounded buffer for undelivered messages (bsc#1273150).
• CVE-2026-66422: Apache Tomcat: Servlet role references can bypass declarative role constraints (bsc#1276898).
• CVE-2026-68525: Apache Tomcat: Redirect after FORM auth may bypass method specific constraints (bsc#1276899).
• CVE-2026-68569: Apache Tomcat: Principal lookup can fail open in some cases (bsc#1276900).
• CVE-2026-68763: Apache Tomcat: DoS via allocation leak in HTTP/2 backlog tracking when a stream is reset (bsc#1276901).
• CVE-2026-73180: Apache Tomcat: Authenticated WebSocket session survives end of HTTP session (bsc#1276902).

Changes for tomcat:

• Updated to version 9.0.121