CVE-2026-59083

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):

Improper Handling of URL Encoding (Hex Encoding) vulnerability in Apache Tomcat's rewrite valve allowed security constraint bypass for some configurations.

This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.23, from 10.1.0-M1 through 10.1.56, from 9.0.0.M1 through 9.0.119, from 8.5.0 through 8.5.100. Other versions that have reached end of support may also be affected.

Users are recommended to upgrade to version 11.0.24, 10.1.57 or 9.0.120, which fix the issue.(CVE-2026-59083)

'Severity: low\n\nAffected versions:\n\n- Apache Tomcat 11.0.0-M1 through 11.0.23\n- Apache Tomcat 10.1.0-M1 through 10.1.56\n- Apache Tomcat 9.0.13 through 9.0.119\n- Apache Tomcat 8.5.38 through 8.5.100\n- Apache Tomcat 7.0.100 through 7.0.109\n\nDescription:', 'Credit:\n\nNDIx (reporter)\n\nReferences:'

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. Tomcat is developed in an open and participatory environment and released under the Apache Software License version 2.0. Tomcat is intended to be a collaboration of the best-of-breed developers from around the world.

Security Fix(es):

• Apache Tomcat: Apache Tomcat: Improper Input Validation vulnerability due to incomplete fix (CVE-2026-32990)

• tomcat-coyote: Apache Tomcat: Authentication bypass via digest authentication (CVE-2026-43512)

• tomcat-coyote: Apache Tomcat: HTTP/2 request headers not validated (CVE-2026-41293)

• tomcat-coyote: Apache Tomcat: Information disclosure due to HTTP Authentication Header exposure during WebSocket authentication. (CVE-2026-42498)

• tomcat-coyote: tomcat: Improper Authorization allows security bypass (CVE-2026-43515)

• tomcat-catalina: Apache Tomcat: Improper Handling of Case Sensitivity in LockOutRealm (CVE-2026-43513)

• tomcat: Apache Tomcat: Security constraint bypass via improper URL encoding in rewrite valve (CVE-2026-59083)

• tomcat: Apache Tomcat: Insufficient documentation for EncryptInterceptor may lead to insecure configurations (CVE-2026-59084)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Apache Tomcat is a servlet container for the Java Servlet and JavaServer Pages (JSP) technologies.

Security Fix(es):

• Apache Tomcat: Apache Tomcat: Improper Input Validation vulnerability due to incomplete fix (CVE-2026-32990)

• tomcat-coyote: Apache Tomcat: Authentication bypass via digest authentication (CVE-2026-43512)

• tomcat-coyote: Apache Tomcat: HTTP/2 request headers not validated (CVE-2026-41293)

• tomcat-coyote: Apache Tomcat: Information disclosure due to HTTP Authentication Header exposure during WebSocket authentication. (CVE-2026-42498)

• tomcat-coyote: tomcat: Improper Authorization allows security bypass (CVE-2026-43515)

• tomcat-catalina: Apache Tomcat: Improper Handling of Case Sensitivity in LockOutRealm (CVE-2026-43513)

• tomcat: Apache Tomcat: Security constraint bypass via improper URL encoding in rewrite valve (CVE-2026-59083)

• tomcat: Apache Tomcat: Insufficient documentation for EncryptInterceptor may lead to insecure configurations (CVE-2026-59084)

Bug Fix(es) and Enhancement(s):

• Tomcat fails to respond to client connections when using Java 8 [rhel-9.8] (JIRA:Rocky Linux-257456)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Apache Tomcat is a servlet container for the Java Servlet and JavaServer Pages (JSP) technologies.

Security Fix(es):

• tomcat-coyote: Apache Tomcat: Authentication bypass via digest authentication (CVE-2026-43512)

• tomcat-coyote: Apache Tomcat: HTTP/2 request headers not validated (CVE-2026-41293)

• tomcat-coyote: Apache Tomcat: Information disclosure due to HTTP Authentication Header exposure during WebSocket authentication. (CVE-2026-42498)

• tomcat-coyote: tomcat: Improper Authorization allows security bypass (CVE-2026-43515)

• tomcat-catalina: Apache Tomcat: Improper Handling of Case Sensitivity in LockOutRealm (CVE-2026-43513)

• tomcat: Apache Tomcat: Authentication bypass via missing critical step in JNDIRealm GSSAPI configuration (CVE-2026-55957)

• tomcat: Apache Tomcat: Security constraint bypass via improper URL encoding in rewrite valve (CVE-2026-59083)

• tomcat: Apache Tomcat: Insufficient documentation for EncryptInterceptor may lead to insecure configurations (CVE-2026-59084)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Improper Handling of URL Encoding (Hex Encoding) vulnerability in Apache Tomcat's rewrite valve allowed security constraint bypass for some configurations. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.23, from 10.1.0-M1 through 10.1.56, from 9.0.0.M1 through 9.0.119, from 8.5.0 through 8.5.100. Other versions that have reached end of support may also be affected. Users are recommended to upgrade to version 11.0.24, 10.1.57 or 9.0.120, which fix the issue.

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. Tomcat is developed in an open and participatory environment and released under the Apache Software License version 2.0. Tomcat is intended to be a collaboration of the best-of-breed developers from around the world.

Security Fix(es):

• Apache Tomcat: Apache Tomcat: Improper Input Validation vulnerability due to incomplete fix (CVE-2026-32990)
• tomcat-coyote: Apache Tomcat: Authentication bypass via digest authentication (CVE-2026-43512)
• tomcat-coyote: Apache Tomcat: HTTP/2 request headers not validated (CVE-2026-41293)
• tomcat-coyote: Apache Tomcat: Information disclosure due to HTTP Authentication Header exposure during WebSocket authentication. (CVE-2026-42498)
• tomcat-coyote: tomcat: Improper Authorization allows security bypass (CVE-2026-43515)
• tomcat-catalina: Apache Tomcat: Improper Handling of Case Sensitivity in LockOutRealm (CVE-2026-43513)
• tomcat: Apache Tomcat: Security constraint bypass via improper URL encoding in rewrite valve (CVE-2026-59083)
• tomcat: Apache Tomcat: Insufficient documentation for EncryptInterceptor may lead to insecure configurations (CVE-2026-59084)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Apache Tomcat is a servlet container for the Java Servlet and JavaServer Pages (JSP) technologies.

Security Fix(es):

• Apache Tomcat: Apache Tomcat: Improper Input Validation vulnerability due to incomplete fix (CVE-2026-32990)
• tomcat-coyote: Apache Tomcat: Authentication bypass via digest authentication (CVE-2026-43512)
• tomcat-coyote: Apache Tomcat: HTTP/2 request headers not validated (CVE-2026-41293)
• tomcat-coyote: Apache Tomcat: Information disclosure due to HTTP Authentication Header exposure during WebSocket authentication. (CVE-2026-42498)
• tomcat-coyote: tomcat: Improper Authorization allows security bypass (CVE-2026-43515)
• tomcat-catalina: Apache Tomcat: Improper Handling of Case Sensitivity in LockOutRealm (CVE-2026-43513)
• tomcat: Apache Tomcat: Security constraint bypass via improper URL encoding in rewrite valve (CVE-2026-59083)
• tomcat: Apache Tomcat: Insufficient documentation for EncryptInterceptor may lead to insecure configurations (CVE-2026-59084)

Bug Fix(es) and Enhancement(s):

• Tomcat fails to respond to client connections when using Java 8 [almalinux-9.8] (JIRA:AlmaLinux-257456)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Apache Tomcat is a servlet container for the Java Servlet and JavaServer Pages (JSP) technologies.

Security Fix(es):

• tomcat-coyote: Apache Tomcat: Authentication bypass via digest authentication (CVE-2026-43512)
• tomcat-coyote: Apache Tomcat: HTTP/2 request headers not validated (CVE-2026-41293)
• tomcat-coyote: Apache Tomcat: Information disclosure due to HTTP Authentication Header exposure during WebSocket authentication. (CVE-2026-42498)
• tomcat-coyote: tomcat: Improper Authorization allows security bypass (CVE-2026-43515)
• tomcat-catalina: Apache Tomcat: Improper Handling of Case Sensitivity in LockOutRealm (CVE-2026-43513)
• tomcat: Apache Tomcat: Authentication bypass via missing critical step in JNDIRealm GSSAPI configuration (CVE-2026-55957)
• tomcat: Apache Tomcat: Security constraint bypass via improper URL encoding in rewrite valve (CVE-2026-59083)
• tomcat: Apache Tomcat: Insufficient documentation for EncryptInterceptor may lead to insecure configurations (CVE-2026-59084)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Improper Handling of URL Encoding (Hex Encoding) vulnerability in Apache Tomcat's rewrite valve allowed security constraint bypass for some configurations.

This issue affects Apache Tomcat: from 11.0.0 through 11.0.23, from 10.1.0 through 10.1.56, from 9.0.0 through 9.0.119, from 8.5.0 through 8.5.100. Other versions that have reached end of support may also be affected.

Users are recommended to upgrade to version 11.0.24, 10.1.57 or 9.0.120, which fix the issue.

• CVE-2026-59083: decode the rewritten URL with Tomcat's UDecoder.URLDecode() instead of java.net.URLDecoder in the RewriteValve, fixing improper URL (hex) encoding handling that could bypass security constraints for some configurations (upstream tomcat 9.0.120)

• SECURITY UPDATE: Security constraint bypass in the RewriteValve - the decoded and normalized request URI used for subsequent security constraint matching was produced with java.net.URLDecoder.decode(), which applies form-encoding rules and converts '+' to a space instead of performing proper URI percent-decoding
  • debian/patches/CVE-2026-59083.patch: use Tomcat's UDecoder.URLDecode() (already imported and used elsewhere in the class) instead of java.net.URLDecoder.decode() to build the decoded request URI
  • CVE-2026-59083

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-9.0.120-1.1 package on the GA media of openSUSE Tumbleweed.

These are all security issues fixed in the tomcat10-10.1.57-1.1 package on the GA media of openSUSE Tumbleweed.

These are all security issues fixed in the tomcat11-11.0.24-1.1 package on the GA media of openSUSE Tumbleweed.

This update for tomcat fixes the following issues:

Update to Tomcat 9.0.120.

Security issues fixed:

• CVE-2026-59083: incorrect URL decoding in RewriteValve may allow security control bypass (bsc#1271397).
• CVE-2026-59084: EncryptInterceptor requirements are not clearly documented (bsc#1271398).

Other updates and bugfixes:

• Tomcat 9.0.120:
  • Catalina
    • Fix: Avoid a race condition with concurrent lookups for a singleton JNDI resource. (markt)
    • Fix: Improve the performance of range validation for the default servlet. (markt)
    • Fix: Avoid NPE in RewriteValve. (markt)
    • Fix: 70127: Fix use of Bootstrap through reflection by restoring the public constructor. Use through scripts was not affected. (remm)
    • Fix: Restore ability to extend many element classes from AbstractAccessLogValve. (remm)
    • Fix: Align DIGEST authentication with RFC 7616 and require clients to provide a valid qop parameter. (markt)
    • Fix: Use Files API to create temporary docBase when antiLockingDocBase is enabled. (markt)
    • Fix: Improve validation of configuration when DataSourceRealm starts. (remm)
    • Fix: JAASRealm should do a logout if login does not fail outright but does not produce a Principal. (remm)
    • Fix: Various edge cases for SSI substitutions, quoting and escaping.
    • Fix: unintentional conversion of literal + to a space during rule processing in the RewriteValve. (markt)
  • Coyote
    • Fix: Avoid a potential JVM crash if a suitable version of Tomcat Native is not available when the connector is explicitly configured to use Tomcat Native with OpenSSL for TLS. (markt)
    • Fix: Correct a regression introduced in 9.0.119 that broke reading of some request bodies via a Reader. (markt)
  • Jasper
    • Fix: 70120: The fix for 69399 (itself a fix for a regression in the fix for 69333) was incomplete and tags that threw exceptions in doStartTag() and doEndTag() were incorrectly re-used. This fix prevents tags from being re-used if such an exception occurs. (markt)
    • Fix: 70135: Fix security classload regression. (remm)
    • Add: support for specifying Java 28 (with the value 28) as the compiler source and/or compiler target for JSP compilation. If used with an Eclipse JDT compiler version that does not support these values, a warning will be logged and the default will be used. (markt)
  • WebSocket
    • Fix: 70126: Fix WebSocket extension permessage-deflate so that it does not drop bytes if a compressed message inflates to more than the available buffer. Fix written by GPT-5.5. Test case written by Hironori Ichimiya. (markt)
    • Fix: Optimise WebSocket client processing of server responses during WebSocket HTTP upgrade process. (markt)
  • Other
    • Update: Byte Buddy to 1.18.9. (markt)
    • Update: UnboundID to 7.0.5. (markt)
    • Update: JaCoCo to 0.8.15. (markt)
    • Update: BND to 7.3.0. (markt)
    • Add: Improvements to French translations. (remm)
    • Add: Improvements to Japanese translations provided by tak7iji. (markt)

This update for tomcat10 fixes the following issues:

Update to Tomcat 10.1.57.

Security issues fixed:

• CVE-2026-59083: incorrect URL decoding in RewriteValve may allow security control bypass (bsc#1271397).
• CVE-2026-59084: EncryptInterceptor requirements are not clearly documented (bsc#1271398).

Other updates and bugfixes:

• Tomcat 10.1.57:
  • Catalina
    • Fix: Avoid a race condition with concurrent lookups for a singleton JNDI resource. (markt)
    • Fix: Improve the performance of range validation for the default servlet. (markt)
    • Fix: Avoid NPE in RewriteValve. (markt)
    • Fix: 70127: Fix use of Bootstrap through reflection by restoring the public constructor. Use through scripts was not affected. (remm)
    • Fix: Restore ability to extend many element classes from AbstractAccessLogValve. (remm)
    • Fix: Align DIGEST authentication with RFC 7616 and require clients to provide a valid qop parameter. (markt)
    • Fix: Use Files API to create temporary docBase when antiLockingDocBase is enabled. (markt)
    • Fix: Improve validation of configuration when DataSourceRealm starts. (remm)
    • Fix: JAASRealm should do a logout if login does not fail outright but does not produce a Principal. (remm)
    • Fix: Various edge cases for SSI substitutions, quoting and escaping.
    • Fix: unintentional conversion of literal + to a space during rule processing in the RewriteValve. (markt)
  • Coyote
    • Fix: Avoid a potential JVM crash if a suitable version of Tomcat Native is not available when the connector is explicitly configured to use Tomcat Native with OpenSSL for TLS. (markt)
  • Jasper
    • Fix: 70120: The fix for 69399 (itself a fix for a regression in the fix for 69333) was incomplete and tags that threw exceptions in doStartTag() and doEndTag() were incorrectly re-used. This fix prevents tags from being re-used if such an exception occurs. (markt)
    • Fix: 70135: Fix security classload regression. (remm)
    • Add: support for specifying Java 28 (with the value 28) as the compiler source and/or compiler target for JSP compilation. If used with an Eclipse JDT compiler version that does not support these values, a warning will be logged and the default will be used. (markt)
  • WebSocket
    • Fix: 70126: Fix WebSocket extension permessage-deflate so that it does not drop bytes if a compressed message inflates to more than the available buffer. Fix written by GPT-5.5. Test case written by Hironori Ichimiya. (markt)
    • Fix: Optimise WebSocket client processing of server responses during WebSocket HTTP upgrade process. (markt)
  • Other
    • Update: Byte Buddy to 1.18.9. (markt)
    • Update: UnboundID to 7.0.5. (markt)
    • Update: JaCoCo to 0.8.15. (markt)
    • Update: BND to 7.3.0. (markt)
    • Add: Improvements to French translations. (remm)
    • Add: Improvements to Japanese translations provided by tak7iji. (markt)

This update for tomcat11 fixes the following issues

• Update to Tomcat 11.0.24
• CVE-2026-59083: Incorrect URL decoding in RewriteValve may allow security control bypass (bsc#1271397).
• CVE-2026-59084: EncryptInterceptor requirements not clearly documented (bsc#1271398).

This update for tomcat10 fixes the following issues:

Update to Tomcat 10.1.57.

Security issues fixed:

• CVE-2026-59083: incorrect URL decoding in RewriteValve may allow security control bypass (bsc#1271397).
• CVE-2026-59084: EncryptInterceptor requirements are not clearly documented (bsc#1271398).

Other updates and bugfixes:

• Tomcat 10.1.57:
  • Catalina
    • Fix: Avoid a race condition with concurrent lookups for a singleton JNDI resource. (markt)
    • Fix: Improve the performance of range validation for the default servlet. (markt)
    • Fix: Avoid NPE in RewriteValve. (markt)
    • Fix: 70127: Fix use of Bootstrap through reflection by restoring the public constructor. Use through scripts was not affected. (remm)
    • Fix: Restore ability to extend many element classes from AbstractAccessLogValve. (remm)
    • Fix: Align DIGEST authentication with RFC 7616 and require clients to provide a valid qop parameter. (markt)
    • Fix: Use Files API to create temporary docBase when antiLockingDocBase is enabled. (markt)
    • Fix: Improve validation of configuration when DataSourceRealm starts. (remm)
    • Fix: JAASRealm should do a logout if login does not fail outright but does not produce a Principal. (remm)
    • Fix: Various edge cases for SSI substitutions, quoting and escaping. (remm)
    • Fix: unintentional conversion of literal + to a space during rule processing in the RewriteValve. (markt)
  • Coyote
    • Fix: Avoid a potential JVM crash if a suitable version of Tomcat Native is not available when the connector is explicitly configured to use Tomcat Native with OpenSSL for TLS. (markt)
  • Jasper
    • Fix: 70120: The fix for 69399 (itself a fix for a regression in the fix for 69333) was incomplete and tags that threw exceptions in doStartTag() and doEndTag() were incorrectly re-used. This fix prevents tags from being re-used if such an exception occurs. (markt)
    • Fix: 70135: Fix security classload regression. (remm)
    • Add: support for specifying Java 28 (with the value 28) as the compiler source and/or compiler target for JSP compilation. If used with an Eclipse JDT compiler version that does not support these values, a warning will be logged and the default will be used. (markt)
  • WebSocket
    • Fix: 70126: Fix WebSocket extension permessage-deflate so that it does not drop bytes if a compressed message inflates to more than the available buffer. Fix written by GPT-5.5. Test case written by Hironori Ichimiya. (markt)
    • Fix: Optimise WebSocket client processing of server responses during WebSocket HTTP upgrade process. (markt)
  • Other
    • Update: Byte Buddy to 1.18.9. (markt)
    • Update: UnboundID to 7.0.5. (markt)
    • Update: JaCoCo to 0.8.15. (markt)
    • Update: BND to 7.3.0. (markt)
    • Add: Improvements to French translations. (remm)
    • Add: Improvements to Japanese translations provided by tak7iji. (markt)

This update for tomcat fixes the following issues:

Update to Tomcat 9.0.120.

Security issues fixed:

• CVE-2026-59083: incorrect URL decoding in RewriteValve may allow security control bypass (bsc#1271397).
• CVE-2026-59084: EncryptInterceptor requirements are not clearly documented (bsc#1271398).

Other updates and bugfixes:

• Tomcat 9.0.120:
  • Catalina
    • Fix: Avoid a race condition with concurrent lookups for a singleton JNDI resource. (markt)
    • Fix: Improve the performance of range validation for the default servlet. (markt)
    • Fix: Avoid NPE in RewriteValve. (markt)
    • Fix: 70127: Fix use of Bootstrap through reflection by restoring the public constructor. Use through scripts was not affected. (remm)
    • Fix: Restore ability to extend many element classes from AbstractAccessLogValve. (remm)
    • Fix: Align DIGEST authentication with RFC 7616 and require clients to provide a valid qop parameter. (markt)
    • Fix: Use Files API to create temporary docBase when antiLockingDocBase is enabled. (markt)
    • Fix: Improve validation of configuration when DataSourceRealm starts. (remm)
    • Fix: JAASRealm should do a logout if login does not fail outright but does not produce a Principal. (remm)
    • Fix: Various edge cases for SSI substitutions, quoting and escaping.
    • Fix: unintentional conversion of literal + to a space during rule processing in the RewriteValve. (markt)
  • Coyote
    • Fix: Avoid a potential JVM crash if a suitable version of Tomcat Native is not available when the connector is explicitly configured to use Tomcat Native with OpenSSL for TLS. (markt)
    • Fix: Correct a regression introduced in 9.0.119 that broke reading of some request bodies via a Reader. (markt)
  • Jasper
    • Fix: 70120: The fix for 69399 (itself a fix for a regression in the fix for 69333) was incomplete and tags that threw exceptions in doStartTag() and doEndTag() were incorrectly re-used. This fix prevents tags from being re-used if such an exception occurs. (markt)
    • Fix: 70135: Fix security classload regression. (remm)
    • Add: support for specifying Java 28 (with the value 28) as the compiler source and/or compiler target for JSP compilation. If used with an Eclipse JDT compiler version that does not support these values, a warning will be logged and the default will be used. (markt)
  • WebSocket
    • Fix: 70126: Fix WebSocket extension permessage-deflate so that it does not drop bytes if a compressed message inflates to more than the available buffer. Fix written by GPT-5.5. Test case written by Hironori Ichimiya. (markt)
    • Fix: Optimise WebSocket client processing of server responses during WebSocket HTTP upgrade process. (markt)
  • Other
    • Update: Byte Buddy to 1.18.9. (markt)
    • Update: UnboundID to 7.0.5. (markt)
    • Update: JaCoCo to 0.8.15. (markt)
    • Update: BND to 7.3.0. (markt)
    • Add: Improvements to French translations. (remm)
    • Add: Improvements to Japanese translations provided by tak7iji. (markt)

This update for tomcat11 fixes the following issues:

Update to Tomcat 11.0.24.

Security issues fixed:

• CVE-2026-59083: incorrect URL decoding in RewriteValve may allow security control bypass (bsc#1271397).
• CVE-2026-59084: EncryptInterceptor requirements are not clearly documented (bsc#1271398).

Other updates and bugfixes:

• Tomcat 11.0.24:
  • Catalina
    • Fix: Avoid a race condition with concurrent lookups for a singleton JNDI resource. (markt)
    • Fix: Improve the performance of range validation for the default servlet. (markt)
    • Fix: Avoid NPE in RewriteValve. (markt)
    • Fix: 70127: Fix use of Bootstrap through reflection by restoring the public constructor. Use through scripts was not affected. (remm)
    • Fix: Restore ability to extend many element classes from AbstractAccessLogValve. (remm)
    • Fix: Align DIGEST authentication with RFC 7616 and require clients to provide a valid qop parameter. (markt)
    • Fix: Use Files API to create temporary docBase when antiLockingDocBase is enabled. (markt)
    • Fix: Improve validation of configuration when DataSourceRealm starts. (remm)
    • Fix: JAASRealm should do a logout if login does not fail outright but does not produce a Principal. (remm)
    • Fix: Various edge cases for SSI substitutions, quoting and escaping.
    • Fix: unintentional conversion of literal + to a space during rule processing in the RewriteValve. (markt)
  • Coyote
    • Fix: Avoid a potential JVM crash if a suitable version of Tomcat Native is not available when the connector is explicitly configured to use Tomcat Native with OpenSSL for TLS. (markt)
  • Jasper
    • Fix: 70120: The fix for 69399 (itself a fix for a regression in the fix for 69333) was incomplete and tags that threw exceptions in doStartTag() and doEndTag() were incorrectly re-used. This fix prevents tags from being re-used if such an exception occurs. (markt)
    • Add: support for specifying Java 28 (with the value 28) as the compiler source and/or compiler target for JSP compilation. If used with an Eclipse JDT compiler version that does not support these values, a warning will be logged and the default will be used. (markt)
  • WebSocket
    • Fix: 70126: Fix WebSocket extension permessage-deflate so that it does not drop bytes if a compressed message inflates to more than the available buffer. Fix written by GPT-5.5. Test case written by Hironori Ichimiya. (markt)
    • Fix: Optimise WebSocket client processing of server responses during WebSocket HTTP upgrade process. (markt)
  • Other
    • Update: to the Eclipse JDT compiler 4.40. (markt)
    • Update: Byte Buddy to 1.18.9. (markt)
    • Update: UnboundID to 7.0.5. (markt)
    • Update: JaCoCo to 0.8.15. (markt)
    • Update: BND to 7.3.0. (markt)
    • Add: Improvements to French translations. (remm)
    • Add: Improvements to Japanese translations provided by tak7iji. (markt)

This update for tomcat fixes the following issues:

Update to Tomcat 9.0.120:

Security issues fixed:

• CVE-2026-59083: incorrect URL decoding in RewriteValve may allow security control bypass (bsc#1271397).
• CVE-2026-59084: EncryptInterceptor requirements are not clearly documented (bsc#1271398).

Other updates and bugfixes:

• Tomcat 9.0.120:
  • Catalina
    • Fix: Avoid a race condition with concurrent lookups for a singleton JNDI resource. (markt)
    • Fix: Improve the performance of range validation for the default servlet. (markt)
    • Fix: Avoid NPE in RewriteValve. (markt)
    • Fix: 70127: Fix use of Bootstrap through reflection by restoring the public constructor. Use through scripts was not affected. (remm)
    • Fix: Restore ability to extend many element classes from AbstractAccessLogValve. (remm)
    • Fix: Align DIGEST authentication with RFC 7616 and require clients to provide a valid qop parameter. (markt)
    • Fix: Use Files API to create temporary docBase when antiLockingDocBase is enabled. (markt)
    • Fix: Improve validation of configuration when DataSourceRealm starts. (remm)
    • Fix: JAASRealm should do a logout if login does not fail outright but does not produce a Principal. (remm)
    • Fix: Various edge cases for SSI substitutions, quoting and escaping.
    • Fix: unintentional conversion of literal + to a space during rule processing in the RewriteValve. (markt)
  • Coyote
    • Fix: Avoid a potential JVM crash if a suitable version of Tomcat Native is not available when the connector is explicitly configured to use Tomcat Native with OpenSSL for TLS. (markt)
    • Fix: Correct a regression introduced in 9.0.119 that broke reading of some request bodies via a Reader. (markt)
  • Jasper
    • Fix: 70120: The fix for 69399 (itself a fix for a regression in the fix for 69333) was incomplete and tags that threw exceptions in doStartTag() and doEndTag() were incorrectly re-used. This fix prevents tags from being re-used if such an exception occurs. (markt)
    • Fix: 70135: Fix security classload regression. (remm)
    • Add: support for specifying Java 28 (with the value 28) as the compiler source and/or compiler target for JSP compilation. If used with an Eclipse JDT compiler version that does not support these values, a warning will be logged and the default will be used. (markt)
  • WebSocket
    • Fix: 70126: Fix WebSocket extension permessage-deflate so that it does not drop bytes if a compressed message inflates to more than the available buffer. Fix written by GPT-5.5. Test case written by Hironori Ichimiya. (markt)
    • Fix: Optimise WebSocket client processing of server responses during WebSocket HTTP upgrade process. (markt)
  • Other
    • Update: Byte Buddy to 1.18.9. (markt)
    • Update: UnboundID to 7.0.5. (markt)
    • Update: JaCoCo to 0.8.15. (markt)
    • Update: BND to 7.3.0. (markt)
    • Add: Improvements to French translations. (remm)
    • Add: Improvements to Japanese translations provided by tak7iji. (markt)