Vulnerability-Lookup

RHSA-2026:19054

Vulnerability from csaf_redhat - Published: 2026-05-19 13:26 - Updated: 2026-05-19 21:29

Summary

Red Hat Security Advisory: tomcat security update

Severity

Important

Notes

Topic: An update for tomcat is now available for Red Hat Enterprise Linux 10. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Details: Apache Tomcat is a servlet container for the Java Servlet and JavaServer Pages (JSP) technologies. Security Fix(es): * tomcat: Apache Tomcat: Certificate revocation bypass due to improper OCSP response validation (CVE-2026-24734) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.

CVE-2026-24734

A flaw was found in Apache Tomcat. When an Online Certificate Status Protocol (OCSP) responder is used, the Tomcat Native component, and Tomcat's FFM port of the Tomcat Native code, does not properly verify or check the freshness of the OCSP response. This improper input validation vulnerability could allow an attacker to bypass certificate revocation checks, potentially leading to the acceptance of revoked certificates.

7.4 (High)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

CWE-295 - Improper Certificate Validation

Affected products

Fixed 9 products

Product	Version	Remediation
Unresolved product id: AppStream-10.2.Z:tomcat-1:10.1.49-1.el10_2.1.noarch	—	Vendor Fix fix
Unresolved product id: AppStream-10.2.Z:tomcat-1:10.1.49-1.el10_2.1.src	—	Vendor Fix fix
Unresolved product id: AppStream-10.2.Z:tomcat-admin-webapps-1:10.1.49-1.el10_2.1.noarch	—	Vendor Fix fix
Unresolved product id: AppStream-10.2.Z:tomcat-docs-webapp-1:10.1.49-1.el10_2.1.noarch	—	Vendor Fix fix
Unresolved product id: AppStream-10.2.Z:tomcat-el-5.0-api-1:10.1.49-1.el10_2.1.noarch	—	Vendor Fix fix
Unresolved product id: AppStream-10.2.Z:tomcat-jsp-3.1-api-1:10.1.49-1.el10_2.1.noarch	—	Vendor Fix fix
Unresolved product id: AppStream-10.2.Z:tomcat-lib-1:10.1.49-1.el10_2.1.noarch	—	Vendor Fix fix
Unresolved product id: AppStream-10.2.Z:tomcat-servlet-6.0-api-1:10.1.49-1.el10_2.1.noarch	—	Vendor Fix fix
Unresolved product id: AppStream-10.2.Z:tomcat-webapps-1:10.1.49-1.el10_2.1.noarch	—	Vendor Fix fix

Threats

Impact Important

References

9 references

URL	Category
https://access.redhat.com/errata/RHSA-2026:19054	self
https://access.redhat.com/security/updates/classi…	external
https://bugzilla.redhat.com/show_bug.cgi?id=2440426	external
https://security.access.redhat.com/data/csaf/v2/a…	self
https://access.redhat.com/security/cve/CVE-2026-24734	self
https://bugzilla.redhat.com/show_bug.cgi?id=2440426	external
https://www.cve.org/CVERecord?id=CVE-2026-24734	external
https://nvd.nist.gov/vuln/detail/CVE-2026-24734	external
https://lists.apache.org/thread/292dlmx3fz1888v6v…	external

JSON

To clipboard

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          "text": "tomcat: Apache Tomcat: Certificate revocation bypass due to improper OCSP response validation",
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        {
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          "text": "This vulnerability doesn\u0027t affect the Apache Tomcat distributed with Red Hat Enterprise 8 and Red Hat Enterprise up to the version 9.7 as the vulnerable code is not built. The vulnerable code is compiled with Red Hat Enterprise Linux 9.8 and above.",
          "title": "Statement"
        },
        {
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          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
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            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 7.4,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N",
            "version": "3.1"
          },
          "products": [
            "AppStream-10.2.Z:tomcat-1:10.1.49-1.el10_2.1.noarch",
            "AppStream-10.2.Z:tomcat-1:10.1.49-1.el10_2.1.src",
            "AppStream-10.2.Z:tomcat-admin-webapps-1:10.1.49-1.el10_2.1.noarch",
            "AppStream-10.2.Z:tomcat-docs-webapp-1:10.1.49-1.el10_2.1.noarch",
            "AppStream-10.2.Z:tomcat-el-5.0-api-1:10.1.49-1.el10_2.1.noarch",
            "AppStream-10.2.Z:tomcat-jsp-3.1-api-1:10.1.49-1.el10_2.1.noarch",
            "AppStream-10.2.Z:tomcat-lib-1:10.1.49-1.el10_2.1.noarch",
            "AppStream-10.2.Z:tomcat-servlet-6.0-api-1:10.1.49-1.el10_2.1.noarch",
            "AppStream-10.2.Z:tomcat-webapps-1:10.1.49-1.el10_2.1.noarch"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "tomcat: Apache Tomcat: Certificate revocation bypass due to improper OCSP response validation"
    }
  ]
}

CVE-2026-24734 (GCVE-0-2026-24734)

Vulnerability from cvelistv5 – Published: 2026-02-17 18:53 – Updated: 2026-03-11 15:19

Title

Apache Tomcat Native, Apache Tomcat: OCSP revocation bypass

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 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.

Severity

No CVSS data available.

CWE

CWE-20 - Improper Input Validation

Assigner

apache

References

1 reference

URL	Tags
https://lists.apache.org/thread/292dlmx3fz1888v6v…	vendor-advisory

Impacted products

2 products

Vendor	Product	Version
Apache Software Foundation	Apache Tomcat Native	Affected: 1.1.23 , ≤ 1.1.34 (semver) Affected: 1.2.0 , ≤ 1.2.39 (semver) Affected: 1.3.0 , ≤ 1.3.4 (semver) Affected: 2.0.0 , ≤ 2.0.11 (semver)
Apache Software Foundation	Apache Tomcat	Affected: 11.0.0-M1 , ≤ 11.0.17 (semver) Affected: 10.1.0-M7 , ≤ 10.1.51 (semver) Affected: 9.0.83 , ≤ 9.0.114 (semver) Unaffected: 0 , ≤ 8.5.100 (semver)

Credits

Joshua Rogers (@MegaManSec)

Show details on NVD website

JSON

To clipboard

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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

RHSA-2026:19054

CVE-2026-24734 (GCVE-0-2026-24734)

Tags

Sightings

Nomenclature