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 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.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
Apache Tomcat Nativeto a version that resolves this vulnerability.Fixed in 1.3.5 - Upgrade
Upgrade
Apache Tomcat Nativeto a version that resolves this vulnerability.Fixed in 2.0.12 - Upgrade
Upgrade
Apache Tomcatto a version that resolves this vulnerability.Fixed in 11.0.18 - Upgrade
Upgrade
Apache Tomcatto a version that resolves this vulnerability.Fixed in 10.1.52 - Upgrade
Upgrade
Apache Tomcatto a version that resolves this vulnerability.Fixed in 9.0.115
Event History
Frequently Asked Questions
What is the severity of CVE-2026-24734?
The severity of CVE-2026-24734 is classified as a high-risk vulnerability due to improper input validation in the OCSP revocation process.
How do I fix CVE-2026-24734?
To fix CVE-2026-24734, upgrade Apache Tomcat and Tomcat Native to the latest versions that address the vulnerability.
Which versions of Apache Tomcat are affected by CVE-2026-24734?
Apache Tomcat versions 9.0.83 to 9.0.114, 10.1.0-M7 to 10.1.51, and 11.0.0-M1 to 11.0.17 are affected by CVE-2026-24734.
Is Apache Tomcat Native also affected by CVE-2026-24734?
Yes, Apache Tomcat Native versions from 1.1.23 to 1.1.34, 1.2.0 to 1.2.39, 1.3.0 to 1.3.4, and 2.0.0 to 2.0.11 are affected by CVE-2026-24734.
What type of vulnerability is CVE-2026-24734?
CVE-2026-24734 is an improper input validation vulnerability that enables OCSP revocation bypass in Apache Tomcat.