---
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
tags:
  - nvd
epss: 0.00517
epssPercentile: 0.43
ingestedAt: '2026-07-03T18:53:52.429Z'
---

## 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`