Apache Tomcat Native&Tomcat: OCSP Validation Bypass 1.3.4/2.0.11
CVE-2026-24734 Published on February 17, 2026
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.
Vulnerability Analysis
CVE-2026-24734 is exploitable with network access, and does not require authorization privileges or user interaction. This vulnerability is consided to have a high level of attack complexity. The potential impact of an exploit of this vulnerability is considered to have a high impact on confidentiality and integrity, and no impact on availability.
Weakness Type
Improper Input Validation
The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.
Products Associated with CVE-2026-24734
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Affected Versions
Apache Software Foundation Apache Tomcat Native:- Version 1.1.23, <= 1.1.34 is affected.
- Version 1.2.0, <= 1.2.39 is affected.
- Version 1.3.0, <= 1.3.4 is affected.
- Version 2.0.0, <= 2.0.11 is affected.
- Version 11.0.0-M1, <= 11.0.17 is affected.
- Version 10.1.0-M7, <= 10.1.51 is affected.
- Version 9.0.83, <= 9.0.114 is affected.
- Before and including 8.5.100 is unaffected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.