CVE-2026-73581: CWE-299 Improper Check for Certificate Revocation in Apache Software Foundation Apache Tomcat
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.
AI Analysis
Technical Summary
This vulnerability (CVE-2026-73581) in Apache Tomcat is classified under CWE-299 (Improper Check for Certificate Revocation). It affects the OpenSSL and OpenSSL-FFM TLS implementations within Apache Tomcat, which fail to properly check certificate revocation status via CRLs when certificates are stored in a keystore. This flaw is present in Apache Tomcat versions from 8.5.0 through 8.5.100, 9.0.0-M1 through 9.0.121, 10.1.0-M1 through 10.1.58, and 11.0.0-M1 through 11.0.25. The vendor has addressed the issue in versions 8.5.101, 9.0.122, 10.1.59, and 11.0.26.
Potential Impact
The vulnerability causes Apache Tomcat to ignore certificate revocation checks via CRLs when using OpenSSL or OpenSSL-FFM TLS implementations with keystore certificates. This could potentially allow the use of revoked certificates in TLS connections, undermining trust and security of encrypted communications. No known exploits in the wild have been reported at this time.
Mitigation Recommendations
Users should upgrade affected Apache Tomcat versions to 8.5.101, 9.0.122, 10.1.59, or 11.0.26 or later, where the issue has been fixed. Applying these official updates is the recommended remediation.
CVE-2026-73581: CWE-299 Improper Check for Certificate Revocation in Apache Software Foundation Apache Tomcat
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.
CVSS v3.1
Score 6.5medium
Affected software
Apache Software Foundation
Apache Tomcat
pkg:maven/org.apache.tomcat/tomcatRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-73581) in Apache Tomcat is classified under CWE-299 (Improper Check for Certificate Revocation). It affects the OpenSSL and OpenSSL-FFM TLS implementations within Apache Tomcat, which fail to properly check certificate revocation status via CRLs when certificates are stored in a keystore. This flaw is present in Apache Tomcat versions from 8.5.0 through 8.5.100, 9.0.0-M1 through 9.0.121, 10.1.0-M1 through 10.1.58, and 11.0.0-M1 through 11.0.25. The vendor has addressed the issue in versions 8.5.101, 9.0.122, 10.1.59, and 11.0.26.
Potential Impact
The vulnerability causes Apache Tomcat to ignore certificate revocation checks via CRLs when using OpenSSL or OpenSSL-FFM TLS implementations with keystore certificates. This could potentially allow the use of revoked certificates in TLS connections, undermining trust and security of encrypted communications. No known exploits in the wild have been reported at this time.
Mitigation Recommendations
Users should upgrade affected Apache Tomcat versions to 8.5.101, 9.0.122, 10.1.59, or 11.0.26 or later, where the issue has been fixed. Applying these official updates is the recommended remediation.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- apache
- Date Reserved
- 2026-08-13T07:31:17.111Z
- State
- PUBLISHED
Threat ID: 6ab3b90df7a7c54106b30f19
Added to database: 09/23/2026, 11:33:33 UTC
Last enriched: 09/23/2026, 11:48:29 UTC
Last updated: 09/24/2026, 01:57:04 UTC
Views: 11
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