CVE-2026-24734 Apache Tomcat Native, Apache Tomcat: OCSP revocation bypass
Attackers can bypass certificate revocation checks in Apache Tomcat when OCSP is enabled, allowing revoked certificates to be accepted.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-24734?
CVE-2026-24734 is a high-severity vulnerability in Apache Tomcat, published on 17 Feb 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Which versions are affected by CVE-2026-24734?
13 open source packages ship an affected version, including org.apache.tomcat.embed:tomcat-embed-core, tomcat and org.apache.tomcat:tomcat-coyote. It affects 2 products.
| Package | Affected | Fixed in |
|---|---|---|
org.apache.tomcat.embed:tomcat-embed-core Maven | From 10.1.0-M7 | 10.1.52 |
org.apache.tomcat.embed:tomcat-embed-core Maven | From 10.1.0-M7 | 10.1.52 |
org.apache.tomcat.embed:tomcat-embed-core Maven | From 11.0.0-M1 | 11.0.18 |
org.apache.tomcat.embed:tomcat-embed-core Maven | From 11.0.0-M1 | 11.0.18 |
org.apache.tomcat.embed:tomcat-embed-core Maven | From 9.0.83 | 9.0.115 |
org.apache.tomcat.embed:tomcat-embed-core Maven | From 9.0.83 | 9.0.115 |
7 more packages
tomcat Bitnami | From 9.0.83 | 9.0.115, 10.1.52, 11.0.18 |
org.apache.tomcat:tomcat-coyote Maven | From 10.1.0-M7 | 10.1.52 |
org.apache.tomcat:tomcat-coyote Maven | From 10.1.0-M7 | 10.1.52 |
org.apache.tomcat:tomcat-coyote Maven | From 11.0.0-M1 | 11.0.18 |
org.apache.tomcat:tomcat-coyote Maven | From 11.0.0-M1 | 11.0.18 |
org.apache.tomcat:tomcat-coyote Maven | From 9.0.83 | 9.0.115 |
org.apache.tomcat:tomcat-coyote Maven | From 9.0.83 | 9.0.115 |
Linux distribution packages (27)
tomcat AlmaLinux:10 | All versions | 1:10.1.49-1.el10_2.1.alma.1 |
tomcat-admin-webapps AlmaLinux:10 | All versions | 1:10.1.49-1.el10_2.1.alma.1 |
tomcat-docs-webapp AlmaLinux:10 | All versions | 1:10.1.49-1.el10_2.1.alma.1 |
tomcat-el-5.0-api AlmaLinux:10 | All versions | 1:10.1.49-1.el10_2.1.alma.1 |
tomcat-jsp-3.1-api AlmaLinux:10 | All versions | 1:10.1.49-1.el10_2.1.alma.1 |
tomcat-lib AlmaLinux:10 | All versions | 1:10.1.49-1.el10_2.1.alma.1 |
tomcat-servlet-6.0-api AlmaLinux:10 | All versions | 1:10.1.49-1.el10_2.1.alma.1 |
tomcat-webapps AlmaLinux:10 | All versions | 1:10.1.49-1.el10_2.1.alma.1 |
tomcat Red Hat:enterprise_linux:10.2 | All versions | 1:10.1.49-1.el10_2.1 |
tomcat-admin-webapps Red Hat:enterprise_linux:10.2 | All versions | 1:10.1.49-1.el10_2.1 |
tomcat-docs-webapp Red Hat:enterprise_linux:10.2 | All versions | 1:10.1.49-1.el10_2.1 |
tomcat-el-5.0-api Red Hat:enterprise_linux:10.2 | All versions | 1:10.1.49-1.el10_2.1 |
tomcat-jsp-3.1-api Red Hat:enterprise_linux:10.2 | All versions | 1:10.1.49-1.el10_2.1 |
tomcat-lib Red Hat:enterprise_linux:10.2 | All versions | 1:10.1.49-1.el10_2.1 |
tomcat-servlet-6.0-api Red Hat:enterprise_linux:10.2 | All versions | 1:10.1.49-1.el10_2.1 |
tomcat-webapps Red Hat:enterprise_linux:10.2 | All versions | 1:10.1.49-1.el10_2.1 |
jws6-tomcat Red Hat:jboss_enterprise_web_server:6.2::el10 | All versions | 0:10.1.49-9.redhat_00007.1.el10jws |
jws6-tomcat-admin-webapps Red Hat:jboss_enterprise_web_server:6.2::el10 | All versions | 0:10.1.49-9.redhat_00007.1.el10jws |
jws6-tomcat-docs-webapp Red Hat:jboss_enterprise_web_server:6.2::el10 | All versions | 0:10.1.49-9.redhat_00007.1.el10jws |
jws6-tomcat-el-5.0-api Red Hat:jboss_enterprise_web_server:6.2::el10 | All versions | 0:10.1.49-9.redhat_00007.1.el10jws |
jws6-tomcat-javadoc Red Hat:jboss_enterprise_web_server:6.2::el10 | All versions | 0:10.1.49-9.redhat_00007.1.el10jws |
jws6-tomcat-jsp-3.1-api Red Hat:jboss_enterprise_web_server:6.2::el10 | All versions | 0:10.1.49-9.redhat_00007.1.el10jws |
jws6-tomcat-lib Red Hat:jboss_enterprise_web_server:6.2::el10 | All versions | 0:10.1.49-9.redhat_00007.1.el10jws |
jws6-tomcat-native Red Hat:jboss_enterprise_web_server:6.2::el10 | All versions | 0:1.3.6-1.redhat_1.el10jws |
jws6-tomcat-native-debuginfo Red Hat:jboss_enterprise_web_server:6.2::el10 | All versions | 0:1.3.6-1.redhat_1.el10jws |
jws6-tomcat-selinux Red Hat:jboss_enterprise_web_server:6.2::el10 | All versions | 0:10.1.49-9.redhat_00007.1.el10jws |
jws6-tomcat-servlet-6.0-api Red Hat:jboss_enterprise_web_server:6.2::el10 | All versions | 0:10.1.49-9.redhat_00007.1.el10jws |
Products include Apache Tomcat, Apache Tomcat Native.
How do I fix CVE-2026-24734?
Upgrade org.apache.tomcat.embed:tomcat-embed-core to a fixed version for your release line: 10.1.52, 11.0.18 or 9.0.115.
Is CVE-2026-24734 being exploited?
There is no known exploitation of CVE-2026-24734 in the wild and no public exploit code.
Other vulnerabilities in Apache Tomcat
Sources
Also known as ALSA-2026:19054, BIT-tomcat-2026-24734, CLEANSTART-2026-ZP28661, CLSA-2026-1774442729, DEBIAN-CVE-2026-24734, GHSA-mgp5-rv84-w37q and 12 more.