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ALSA-2026:68677 — Important: tomcat security update

2026-10-03T16:38:54.045251+00:00

Affected: AlmaLinux:8: tomcat, AlmaLinux:8: tomcat-admin-webapps, AlmaLinux:8: tomcat-docs-webapp, AlmaLinux:8: tomcat-el-3.0-api, AlmaLinux:8: tomcat-jsp-2.3-api, AlmaLinux:8: tomcat-lib, AlmaLinux:8: tomcat-servlet-4.0-api, AlmaLinux:8: tomcat-webapps

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.

bdu:2026-13719

2026-10-03T16:38:54.045416+00:00

bdu:2026-13719

BIT-tomcat-2026-55957 — Apache Tomcat: Authentication bypass with JNDIRealm and GSSAPI authenticated bind

2026-10-03T16:38:54.045447+00:00

Affected: Bitnami: tomcat

This issue affects Apache Tomcat: from 11.0.0 through 11.0.4, from 10.1.0 through 10.1.36, from 9.0.0 through 9.0.100, from 8.5.0 through 8.5.100, from 7.0.0 through 7.0.109.

Users are recommended to upgrade to version 11.0.5, 10.1.37 or 9.0.101, which fixes the issue.

EUVD-2026-331366

2026-10-03T16:38:54.045491+00:00

EUVD-2026-331366

fkie_cve-2026-55957

2026-10-03T16:38:54.045514+00:00

This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.4, from 10.1.0-M1 through 10.1.36, from 9.0.0.M1 through 9.0.100, from 8.5.0 through 8.5.100, from 7.0.0 through 7.0.109.

Users are recommended to upgrade to version 11.0.5, 10.1.37 or 9.0.101, which fixes the issue.

GHSA-7895-gffq-w6jq

2026-10-03T16:38:54.045563+00:00

This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.4, from 10.1.0-M1 through 10.1.36, from 9.0.0.M1 through 9.0.100, from 8.5.0 through 8.5.100, from 7.0.0 through 7.0.109.

Users are recommended to upgrade to version 11.0.5, 10.1.37 or 9.0.101, which fixes the issue.

OESA-2026-2947 — tomcat security update

2026-10-03T16:38:54.045603+00:00

Affected: openEuler:20.03-LTS-SP4: tomcat

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 Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS) vulnerability in the number guess example for Apache Tomcat.

This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.22, from 10.1.0-M1 through 10.1.55, from 9.0.0.M1 through 9.0.118, from 8.5.0 through 8.5.100, from 7.0.0 through 7.0.109. Other versions that have reached end of support may also be affected.

Users are recommended to upgrade to version 11.0.23, 10.1.56 or 9.0.119, which fix the issue.(CVE-2026-50229)

Always-Incorrect Control Flow Implementation vulnerability in Apache Tomcat's rewrite valve meant that if the first condition in an OR chain matched, subsequent non-OR conditions were skipped.

This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.22, from 10.1.0-M1 through 10.1.55, from 9.0.0.M1 through 9.0.118, 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 11.0.23, 10.1.56 or 9.0.119, which fix the issue.(CVE-2026-53404)

Detection of Error Condition Without Action vulnerability in Apache Tomcat when configuring CRLs for a FFM based connector.

This issue affects Apache Tomcat: from 11.0.0-M1 through…

RHSA-2026:18536 — Red Hat Security Advisory: tomcat9 security update

2026-10-03T16:38:54.045710+00:00

tomcat: Improper Handling of Exceptional Conditions tomcat: Denial of Service in Tomcat tomcat: Apache Tomcat: Security constraint bypass for CGI scripts org.apache.tomcat/tomcat-catalina: tomcat: Apache Tomcat: session fixation via rewrite valve org.apache.tomcat/tomcat-juli: tomcat: Apache Tomcat: console manipulation tomcat: org.apache.tomcat/tomcat-catalina: Apache Tomcat: Denial of service tomcat: Apache Tomcat: Authentication bypass via missing critical step in JNDIRealm GSSAPI configuration

RHSA-2026:68659 — Red Hat Security Advisory: tomcat security update

2026-10-03T16:38:54.045759+00:00

tomcat: Apache Tomcat: Authentication bypass when using Jakarta Authentication API tomcat: Apache Tomcat: DoS in examples web application tomcat: Apache Tomcat: Security constraint bypass for CGI scripts org.apache.tomcat/tomcat-catalina: tomcat: Apache Tomcat: session fixation via rewrite valve org.apache.tomcat/tomcat-juli: tomcat: Apache Tomcat: console manipulation tomcat: org.apache.tomcat/tomcat-catalina: Apache Tomcat: Denial of service tomcat: Client certificate verification bypass due to virtual host mapping tomcat: security constraint bypass with HTTP/0.9 Apache Tomcat: Apache Tomcat: HTTP Request/Response Smuggling via invalid chunk extension Apache Tomcat: Apache Tomcat: Open Redirect vulnerability via LoadBalancerDrainingValve Apache Tomcat: Apache Tomcat: Authentication bypass due to CLIENT_CERT soft fail misconfiguration Apache Tomcat: Apache Tomcat: Improper Input Validation vulnerability due to incomplete fix Apache Tomcat: Apache Tomcat: Information disclosure due to improper encoding in JsonAccessLogValve Apache Tomcat: Apache Tomcat: Information disclosure via sensitive data in log files tomcat: Apache Tomcat: Denial of Service due to uncontrolled resource allocation tomcat-coyote: Apache Tomcat: HTTP/2 request headers not validated tomcat-coyote: Apache Tomcat: Information disclosure due to HTTP Authentication Header exposure during WebSocket authentication. tomcat-coyote: Apache Tomcat: Authentication bypass via digest authentication tomcat-catalina: Ap…

RLSA-2026:68677 — Important: tomcat security update

2026-10-03T16:38:54.045870+00:00

Affected: Rocky Linux:8: tomcat

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.

UBUNTU-CVE-2026-55957

2026-10-03T16:38:54.045954+00:00

Affected: Ubuntu:Pro:14.04:LTS: tomcat6, Ubuntu:Pro:14.04:LTS: tomcat7, Ubuntu:Pro:16.04:LTS: tomcat8, Ubuntu:Pro:16.04:LTS: tomcat7, Ubuntu:Pro:18.04:LTS: tomcat8, Ubuntu:Pro:18.04:LTS: tomcat9, Ubuntu:Pro:20.04:LTS: tomcat9, Ubuntu:Pro:22.04:LTS: tomcat9, Ubuntu:24.04:LTS: tomcat10, Ubuntu:24.04:LTS: tomcat9 and 6 more

Missing Critical Step in Authentication vulnerability in Apache Tomcat when the JNDIRealm was configured to authenticate binds using GSSAPI allowed attackers to authenticate without provided the correct password. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.4, from 10.1.0-M1 through 10.1.36, from 9.0.0.M1 through 9.0.100, from 8.5.0 through 8.5.100, from 7.0.0 through 7.0.109. Users are recommended to upgrade to version 11.0.5, 10.1.37 or 9.0.101, which fixes the issue.

WID-SEC-W-2026-2123 — Apache Tomcat: Mehrere Schwachstellen

2026-10-03T16:38:54.046031+00:00

Ein Angreifer kann mehrere Schwachstellen in Apache Tomcat ausnutzen, um Sicherheitsmaßnahmen zu umgehen, einen Denial-of-Service-Zustand zu verursachen, Cross-Site-Scripting-Angriffe durchzuführen oder andere, nicht näher spezifizierte Auswirkungen auszulösen.