--- id: CVE-2026-24734 title: >- 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 … summary: >- 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 … severity: high cvss: 7.5 cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N' cwe: - CWE-20 - CWE-295 vendor: apache product: tomcat affected: - 'tomcat >= 9.0.83, < 9.0.115' - 'tomcat >= 10.1.1, < 10.1.52' - 'tomcat >= 11.0.1, < 11.0.18' - tomcat = 10.1.0 - tomcat = 11.0.0 - 'tomcat_native >= 1.3.0, < 1.3.5' - 'tomcat_native >= 2.0.0, < 2.0.12' patched: - tomcat 11.0.18 - tomcat_native 2.0.12 published: '2026-02-17' updated: '2026-06-30' source: NVD sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-24734' references: - url: 'https://lists.apache.org/thread/292dlmx3fz1888v6v16221kpozq56gml' label: security@apache.org - url: 'https://access.redhat.com/errata/RHSA-2026:19054' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:26323' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:5611' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:5612' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:6569' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:8334' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/security/cve/CVE-2026-24734' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2440426' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: >- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-24734.json label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://www.cve.org/CVERecord?id=CVE-2026-24734' - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-24734' - url: 'https://access.redhat.com/errata/RHSA-2026:25341' tags: - nvd - csaf - vex - red-hat epss: 0.00575 epssPercentile: 0.47261 ingestedAt: '2026-07-03T18:53:52.429Z' scores: nvd: 7.5 vendor: 7.4 --- ## Overview 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 - `tomcat >= 9.0.83, < 9.0.115` - `tomcat >= 10.1.1, < 10.1.52` - `tomcat >= 11.0.1, < 11.0.18` - `tomcat = 10.1.0` - `tomcat = 11.0.0` - `tomcat_native >= 1.3.0, < 1.3.5` - `tomcat_native >= 2.0.0, < 2.0.12` ## Remediation Upgrade past the affected range: - `tomcat 11.0.18` - `tomcat_native 2.0.12` ## Vendor advisories - **RHSA-2026:5611** · Red Hat · fixed in: 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 · released 2026-03-25 · [advisory](https://access.redhat.com/errata/RHSA-2026:5611) - **RHSA-2026:19054** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 10) · released 2026-05-19 · [advisory](https://access.redhat.com/errata/RHSA-2026:19054) - **RHSA-2026:26323** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 9) · released 2026-06-16 · [advisory](https://access.redhat.com/errata/RHSA-2026:26323) - **RHSA-2026:8334** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-04-15 · [advisory](https://access.redhat.com/errata/RHSA-2026:8334) - **RHSA-2026:6569** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-04-04 · [advisory](https://access.redhat.com/errata/RHSA-2026:6569) - **RHSA-2026:5612** · Red Hat · fixed in: Red Hat JBoss Web Server 6.2.1 · released 2026-03-25 · [advisory](https://access.redhat.com/errata/RHSA-2026:5612) - **Red Hat VEX** · Important · affected: Red Hat JBoss Web Server 5 · no fix planned: Red Hat JBoss Web Server 5 · updated 2026-09-28 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-24734.json) - **RHSA-2026:25341** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 10) · released 2026-06-11 · [advisory](https://access.redhat.com/errata/RHSA-2026:25341)