Bug 2440426 (CVE-2026-24734)

Summary: CVE-2026-24734 tomcat: Apache Tomcat: Certificate revocation bypass due to improper OCSP response validation
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedCC: csutherl, dsoumis, jclere, pjindal, plodge, rhel-process-autobot, rmaucher, szappis, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in Apache Tomcat. When an Online Certificate Status Protocol (OCSP) responder is used, the Tomcat Native component, and Tomcat's FFM port of the Tomcat Native code, does not properly verify or check the freshness of the OCSP response. This improper input validation vulnerability could allow an attacker to bypass certificate revocation checks, potentially leading to the acceptance of revoked certificates.
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Description OSIDB Bzimport 2026-02-17 20:04:07 UTC 
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 allow certificate revocation to be bypassed.

This issue affects Apache Tomcat Native:  from 1.3.0 through 1.3.4, from 2.0.0 through 2.0.11; Apache Tomcat: from 11.0.0-M1 through 11.0.17, from 10.1.0-M7 through 10.1.51, from 9.0.83 through 9.0.114.


The following versions were EOL at the time the CVE was created but are 
known to be affected: from 1.1.23 through 1.1.34, from 1.2.0 through 1.2.39. Older EOL versions are not affected.

Apache Tomcat Native users are recommended to upgrade to versions 1.3.5 or later or 2.0.12 or later, which fix the issue.

Apache Tomcat users are recommended to upgrade to versions 11.0.18 or later, 10.1.52 or later or 9.0.115 or later which fix the issue.
Comment 2 errata-xmlrpc 2026-03-25 16:44:27 UTC 
This issue has been addressed in the following products:

  Red Hat JBoss Web Server 6.2.1

Via RHSA-2026:5612 https://access.redhat.com/errata/RHSA-2026:5612
Comment 3 errata-xmlrpc 2026-03-25 16:46:48 UTC 
This issue has been addressed in the following products:

  Red Hat JBoss Web Server 6.2 on RHEL 10
  Red Hat JBoss Web Server 6.2 on RHEL 8
  Red Hat JBoss Web Server 6.2 on RHEL 9

Via RHSA-2026:5611 https://access.redhat.com/errata/RHSA-2026:5611
Comment 4 errata-xmlrpc 2026-05-19 13:06:59 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:19054 https://access.redhat.com/errata/RHSA-2026:19054