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bdu:2026-07145

BIT-tomcat-2026-34483 — Apache Tomcat: Incomplete escaping of JSON access logs

Affected: Bitnami: tomcat

Improper Encoding or Escaping of Output vulnerability in the JsonAccessLogValve component of Apache Tomcat.

This issue affects Apache Tomcat: from 11.0.0 through 11.0.20, from 10.1.0 through 10.1.53, from 9.0.40 through 9.0.116.

Users are recommended to upgrade to version 11.0.21, 10.1.54 or 9.0.117 , which fix the issue.

certfr-2026-avi-0418 — De multiples vulnérabilités ont été découvertes dans Apache Tomcat. Elles permettent à un attaquant de provoquer une at…

certfr-2026-avi-0418

Withdrawn: CLEANSTART-2026-IS05941 — CLIENT_CERT authentication does not fail as expected for some scenarios when soft fail is disabled vulnerability in Apa…

Withdrawn by the publisher.

Affected: CleanStart: thingsboard

Multiple security vulnerabilities affect the thingsboard package. CLIENT_CERT authentication does not fail as expected for some scenarios when soft fail is disabled vulnerability in Apache Tomcat, Apache Tomcat Native. See references for individual vulnerability details.

EUVD-2026-290497

fkie_cve-2026-34483

Improper Encoding or Escaping of Output vulnerability in the JsonAccessLogValve component of Apache Tomcat.

This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.20, from 10.1.0-M1 through 10.1.53, from 9.0.40 through 9.0.116.

Users are recommended to upgrade to version 11.0.21, 10.1.54 or 9.0.117 , which fix the issue.

GHSA-rv64-5gf8-9qq8 — Apache Tomcat has an Improper Encoding or Escaping of Output vulnerability in the JsonAccessLogValve

Affected: Maven: org.apache.tomcat:tomcat-catalina, Maven: org.apache.tomcat:tomcat, Maven: org.apache.tomcat.embed:tomcat-embed-core

Improper Encoding or Escaping of Output vulnerability in the JsonAccessLogValve component of Apache Tomcat.

This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.20, from 10.1.0-M1 through 10.1.53, from 9.0.40 through 9.0.116.

Users are recommended to upgrade to version 11.0.21, 10.1.54 or 9.0.117 , which fix the issue.

OESA-2026-1970 — tomcat security update

Affected: openEuler:24.03-LTS-SP3: tomcat, openEuler:20.03-LTS-SP4: tomcat, openEuler:22.03-LTS-SP4: tomcat, openEuler:24.03-LTS: tomcat, openEuler:24.03-LTS-SP1: tomcat, openEuler:24.03-LTS-SP2: tomcat

Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling') vulnerability in Apache Tomcat via invalid chunk extension.

This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.18, from 10.1.0-M1 through 10.1.52, from 9.0.0.M1 through 9.0.115, from 8.5.0 through 8.5.100, from 7.0.0 through 7.0.109. Other, unsupported versions may also be affected.

Users are recommended to upgrade to version 11.0.20, 10.1.52 or 9.0.116, which fix the issue.(CVE-2026-24880)

Occasional URL redirection to untrusted Site ('Open Redirect') vulnerability in Apache Tomcat via the LoadBalancerDrainingValve.

This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.18, from 10.1.0-M1 through 10.1.52, from 9.0.0.M23 through 9.0.115, from 8.5.30 through 8.5.100. Other, unsupported versions may also be affected

Users are recommended to upgrade to version 11.0.20, 10.1.53 or 9.0.116, which fix the issue.(CVE-2026-25854)

Configured cipher preference order not preserved vulnerability in Apache Tomcat.

This issue affects Apache Tomcat: from 11.0.16 through 11.0.18, from 10.1.51 through 10.1.52, from 9.0.114 through 9.0.115.

Users are recommended to upgrade to version 11.0.20, 10.1.53…

openSUSE-SU-2026:10547-1 — tomcat-9.0.117-1.1 on GA media

tomcat-9.0.117-1.1 on GA media

RHSA-2026:20405 — Red Hat Security Advisory: Red Hat JBoss Web Server 6.2.3 release and security update

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: Information disclosure via Padding Oracle vulnerability in EncryptInterceptor Apache Tomcat: Apache Tomcat: Information disclosure due to improper encoding in JsonAccessLogValve Apache Tomcat: Apache Tomcat: Information disclosure via sensitive data in log files Apache Tomcat: Apache Tomcat: Authentication bypass via client certificate misconfiguration

RLSA-2026:25341 — Important: tomcat9 security update

Affected: Rocky Linux:10: tomcat9

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):

* tomcat: Apache Tomcat: Certificate revocation bypass due to improper OCSP response validation (CVE-2026-24734)

* tomcat: Client certificate verification bypass due to virtual host mapping (CVE-2025-66614)

* tomcat: security constraint bypass with HTTP/0.9 (CVE-2026-24733)

* Apache Tomcat: Apache Tomcat: Authentication bypass due to CLIENT_CERT soft fail misconfiguration (CVE-2026-29145)

* Apache Tomcat: Apache Tomcat: Information disclosure via sensitive data in log files (CVE-2026-34487)

* Apache Tomcat: Apache Tomcat: Open Redirect vulnerability via LoadBalancerDrainingValve (CVE-2026-25854)

* Apache Tomcat: Apache Tomcat: HTTP Request/Response Smuggling via invalid chunk extension (CVE-2026-24880)

* Apache Tomcat: Apache Tomcat: Authentication bypass via client certificate misconfiguration (CVE-2026-34500)

* Apache Tomcat: Apache Tomcat: Information disclosure due to improper encoding in JsonAccessLogValve (CVE-2026-34483)

For more details about the security issue(s), including the…

SUSE-SU-2026:1572-1 — Security update for tomcat

Security update for tomcat

UBUNTU-CVE-2026-34483

Affected: Ubuntu:24.04:LTS: tomcat10, Ubuntu:25.10: tomcat10, Ubuntu:25.10: tomcat11, Ubuntu:25.10: tomcat9, Ubuntu:26.04:LTS: tomcat10, Ubuntu:26.04:LTS: tomcat9, Ubuntu:26.04:LTS: tomcat11

Improper Encoding or Escaping of Output vulnerability in the JsonAccessLogValve component of Apache Tomcat. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.20, from 10.1.0-M1 through 10.1.53, from 9.0.40 through 9.0.116. Users are recommended to upgrade to version 11.0.21, 10.1.54 or 9.0.117 , which fix the issue.

WID-SEC-W-2026-1038 — Apache Tomcat und Tomcat Native: Mehrere Schwachstellen

Ein Angreifer kann mehrere Schwachstellen in Apache Tomcat ausnutzen, um Sicherheitsmaßnahmen zu umgehen, Daten zu manipulieren, vertrauliche Informationen offenzulegen, Open-Redirect-Angriffe durchzuführen und andere, nicht näher spezifizierte Angriffe auszuführen.