RHSA-2026:26323 — Red Hat Security Advisory: tomcat security update

Fixed packages 8

Release	Package	Fixed in
Red Hat · RHEL 9 enterprise_linux:9::appstream	tomcat	1:9.0.117-1.el9_8
Red Hat · RHEL 9 enterprise_linux:9::appstream	tomcat-admin-webapps	1:9.0.117-1.el9_8
Red Hat · RHEL 9 enterprise_linux:9::appstream	tomcat-docs-webapp	1:9.0.117-1.el9_8
Red Hat · RHEL 9 enterprise_linux:9::appstream	tomcat-el-3.0-api	1:9.0.117-1.el9_8
Red Hat · RHEL 9 enterprise_linux:9::appstream	tomcat-jsp-2.3-api	1:9.0.117-1.el9_8
Red Hat · RHEL 9 enterprise_linux:9::appstream	tomcat-lib	1:9.0.117-1.el9_8
Red Hat · RHEL 9 enterprise_linux:9::appstream	tomcat-servlet-4.0-api	1:9.0.117-1.el9_8
Red Hat · RHEL 9 enterprise_linux:9::appstream	tomcat-webapps	1:9.0.117-1.el9_8

Vulnerabilities 9

Critical 9.1

CVE-2026-29145 Public exploit

Apache Tomcat, Apache Tomcat Native: OCSP checks sometimes soft-fail even when soft-fail is disabled

CLIENT_CERT authentication does not fail as expected for some scenarios when soft fail is disabled vulnerability in Apache Tomcat, Apache Tomcat Native. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.18, from 10.1.0-M7 through 10.1.52, from 9.0…

Apache Software Foundation Apache Tomcat Apache Tomcat Native thingsboard-tb-node Debian Ubuntu Alpine Wolfi Maven

Apr 9, 2026
High 7.6

CVE-2025-66614

Apache Tomcat: Client certificate verification bypass due to virtual host mapping

Improper Input Validation vulnerability. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.14, from 10.1.0-M1 through 10.1.49, from 9.0.0-M1 through 9.0.112. The following versions were EOL at the time the CVE was created but are known to be affec…

Apache Software Foundation Apache Tomcat thingsboard-tb-node thingsboard-tb-mqtt-transport Debian Ubuntu Wolfi Maven

Feb 17, 2026
High 7.5

CVE-2026-24880 Public exploit

Apache Tomcat: Request smuggling via invalid chunk extension

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 throug…

Apache Software Foundation Apache Tomcat tomcat8 tomcat9 Debian Ubuntu Maven

Apr 9, 2026
High 7.5

CVE-2026-34483

Apache Tomcat: Incomplete escaping of JSON access logs

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…

Apache Software Foundation Apache Tomcat thingsboard-tb-node thingsboard-tb-mqtt-transport Debian Ubuntu Wolfi Maven

Apr 9, 2026
High 7.5

CVE-2026-34487

Apache Tomcat: Cloud membership for clustering component exposed the Kubernetes bearer token

Insertion of Sensitive Information into Log File vulnerability in the cloud membership for clustering component of Apache Tomcat exposed the Kubernetes bearer token. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.20, from 10.1.0-M1 through 10.1…

Apache Software Foundation Apache Tomcat thingsboard-tb-node thingsboard-tb-mqtt-transport Debian Ubuntu Wolfi Maven

Apr 9, 2026
High 7.4

CVE-2026-24734

Apache Tomcat Native, Apache Tomcat: OCSP revocation bypass

Improper Input Validation vulnerability in Apache Tomcat Native, Apache Tomcat. When using an OCSP responder, Tomcat Native (and Tomcat's FFM port of the Tomcat Native code) did not complete verification or freshness checks on the OCSP response which could al…

Apache Software Foundation Apache Tomcat Apache Tomcat Native tomcat9 Debian Ubuntu Alpine Maven

Feb 17, 2026
Medium 6.5

CVE-2026-24733 Public exploit

Apache Tomcat: Security constraint bypass with HTTP/0.9

Improper Input Validation vulnerability in Apache Tomcat. Tomcat did not limit HTTP/0.9 requests to the GET method. If a security constraint was configured to allow HEAD requests to a URI but deny GET requests, the user could bypass that constraint on GET req…

Apache Software Foundation Apache Tomcat thingsboard-tb-node thingsboard-tb-mqtt-transport Debian Ubuntu Wolfi Maven

Feb 17, 2026
Medium 6.5

CVE-2026-34500

Apache Tomcat: OCSP checks sometimes soft-fail with FFM even when soft-fail is disabled

CLIENT_CERT authentication does not fail as expected for some scenarios when soft fail is disabled and FFM is used in Apache Tomcat. This issue affects Apache Tomcat: from 11.0.0-M14 through 11.0.20, from 10.1.22 through 10.1.53, from 9.0.92 through 9.0.116. …

Apache Software Foundation Apache Tomcat thingsboard-tb-node thingsboard-tb-mqtt-transport Debian Ubuntu Wolfi Maven

Apr 9, 2026
Medium 6.1

CVE-2026-25854 Public exploit

Apache Tomcat: Occasionally open redirect

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, …

Apache Software Foundation Apache Tomcat thingsboard-tb-node thingsboard-tb-mqtt-transport Debian Ubuntu Wolfi Maven

Apr 9, 2026

References

article
https://access.redhat.com/security/updates/classification/#important
report
https://bugzilla.redhat.com/show_bug.cgi?id=2440426
advisory
https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_26323.json
report
https://access.redhat.com/security/cve/CVE-2025-66614
report
https://bugzilla.redhat.com/show_bug.cgi?id=2440430
advisory
https://www.cve.org/CVERecord?id=CVE-2025-66614
advisory
https://nvd.nist.gov/vuln/detail/CVE-2025-66614
article
https://lists.apache.org/thread/vw6lxtlh2qbqwpb61wd3sv1flm2nttw7
report
https://access.redhat.com/security/cve/CVE-2026-24733
report
https://bugzilla.redhat.com/show_bug.cgi?id=2440437
advisory
https://www.cve.org/CVERecord?id=CVE-2026-24733
advisory
https://nvd.nist.gov/vuln/detail/CVE-2026-24733
article
https://lists.apache.org/thread/6xk3t65qpn1myp618krtfotbjn1qt90f
report
https://access.redhat.com/security/cve/CVE-2026-24734
advisory
https://www.cve.org/CVERecord?id=CVE-2026-24734
advisory
https://nvd.nist.gov/vuln/detail/CVE-2026-24734
article
https://lists.apache.org/thread/292dlmx3fz1888v6v16221kpozq56gml
report
https://access.redhat.com/security/cve/CVE-2026-24880
report
https://bugzilla.redhat.com/show_bug.cgi?id=2457040
advisory
https://www.cve.org/CVERecord?id=CVE-2026-24880
advisory
https://nvd.nist.gov/vuln/detail/CVE-2026-24880
article
https://lists.apache.org/thread/2c682qnlg2tv4o5knlggqbl9yc2gb5sn
report
https://access.redhat.com/security/cve/CVE-2026-25854
report
https://bugzilla.redhat.com/show_bug.cgi?id=2457039
advisory
https://www.cve.org/CVERecord?id=CVE-2026-25854
advisory
https://nvd.nist.gov/vuln/detail/CVE-2026-25854
article
https://lists.apache.org/thread/ghct3b6o74bp2vm7q875s1zh0dqrz3h0
report
https://access.redhat.com/security/cve/CVE-2026-29145
report
https://bugzilla.redhat.com/show_bug.cgi?id=2457037
advisory
https://www.cve.org/CVERecord?id=CVE-2026-29145
advisory
https://nvd.nist.gov/vuln/detail/CVE-2026-29145
article
https://lists.apache.org/thread/yz5fxmhd2j43wgqykssdo7kltws57jfz
report
https://access.redhat.com/security/cve/CVE-2026-34483
report
https://bugzilla.redhat.com/show_bug.cgi?id=2457044
advisory
https://www.cve.org/CVERecord?id=CVE-2026-34483
advisory
https://nvd.nist.gov/vuln/detail/CVE-2026-34483
article
https://lists.apache.org/thread/j1w7304yonlr8vo1tkb5nfs7od1y228b
report
https://access.redhat.com/security/cve/CVE-2026-34487
report
https://bugzilla.redhat.com/show_bug.cgi?id=2457038

Red Hat Security Advisory: tomcat security update

Fixed packages 8

Vulnerabilities 9

Apache Tomcat, Apache Tomcat Native: OCSP checks sometimes soft-fail even when soft-fail is disabled

Apache Tomcat: Client certificate verification bypass due to virtual host mapping

Apache Tomcat: Request smuggling via invalid chunk extension

Apache Tomcat: Incomplete escaping of JSON access logs

Apache Tomcat: Cloud membership for clustering component exposed the Kubernetes bearer token

Apache Tomcat Native, Apache Tomcat: OCSP revocation bypass

Apache Tomcat: Security constraint bypass with HTTP/0.9

Apache Tomcat: OCSP checks sometimes soft-fail with FFM even when soft-fail is disabled

Apache Tomcat: Occasionally open redirect

References