CVE-2026-73581
Received Received - Intake

Improper Certificate Revocation Check in Apache Tomcat

Publication date: 2026-09-23

Last updated on: 2026-09-23

Assigner: Apache Software Foundation

Description
Improper Check for Certificate Revocation vulnerability in Apache Tomcat. Both the OpenSSL and OpenSSL-FFM TLS implementations ignore CRLs when certificate uses a keystore. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.25, from 10.1.0-M1 through 10.1.58, from 9.0.0-M1 through 9.0.121. The following versions were EOL at the time the CVE was created but are known to be affected: from 8.5.0 through 8.5.100. Other unsupported versions may also be affected. Users are recommended to upgrade to version 11.0.26, 10.1.59, 9.0.122, which fixes the issue.

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Meta Information

Published
2026-09-23
Last Modified
2026-09-23
Generated
2026-09-23
AI Q&A
2026-09-23
EPSS Evaluated
N/A
NVD
CVE-2026-73581
EUVD
EUVD-2026-85222

Affected Vendors & Products

Showing 4 associated CPEs
Vendor Product Version / Range
apache tomcat From 11.0.0-M1 (inc) to 11.0.25 (inc)
apache tomcat From 10.1.0-M1 (inc) to 10.1.58 (inc)
apache tomcat From 9.0.0-M1 (inc) to 9.0.121 (inc)
apache tomcat From 8.5.0 (inc) to 8.5.100 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-299 The product does not check or incorrectly checks the revocation status of a certificate, which may cause it to use a certificate that has been compromised.

Attack-Flow Graph

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Executive Summary

This vulnerability in Apache Tomcat involves improper checking of certificate revocation. Both OpenSSL and OpenSSL-FFM TLS implementations fail to validate Certificate Revocation Lists (CRLs) when a certificate uses a keystore, potentially allowing revoked certificates to be trusted.

Detection Guidance

To detect this vulnerability, check the Apache Tomcat version running on your system. Compare it against affected versions: 11.0.0-M1 to 11.0.25, 10.1.0-M1 to 10.1.58, 9.0.0-M1 to 9.0.121, or 8.5.0 to 8.5.100. Use commands like 'catalina.sh version' or check package managers for Tomcat version.

Impact Analysis

This flaw could allow attackers to use revoked certificates for malicious activities like man-in-the-middle attacks or unauthorized access. Systems relying on Tomcat for secure communications may be exposed to security breaches if not patched.

Compliance Impact

This vulnerability may impact compliance with GDPR and HIPAA by potentially allowing unauthorized access to sensitive data due to improper certificate revocation checks. Weakened TLS validation could lead to data breaches, violating confidentiality requirements in these regulations.

Mitigation Strategies

Upgrade Apache Tomcat to version 11.0.26, 10.1.59, or 9.0.122, depending on your current version. If using an unsupported version like 8.5.x, upgrade to a supported release or apply vendor patches if available.

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