CVE-2026-73581Network attack vectorHinoki check available

Authentication bypass via omitted CRL enforcement

Published Sep 23, 2026 · Updated Sep 23, 2026

Certificate-revocation bypass in Apache Tomcat 9, 10.1, and 11 allows remote attackers to authenticate with revoked client certificates. The OpenSSL and OpenSSL-FFM TLS paths failed to load the configured CRL into the OpenSSL trust store and enable CRL checking when the server key came from a Java keystore. Exposure requires client-certificate authentication with OpenSSL trust, a keystore-held server key, a configured CRL, and a revoked certificate trusted by the server.

CVSS severityUnavailable
Unscored
EPSS probability0.12%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Certificate-revocation bypass in Apache Tomcat 9, 10.1, and 11 allows remote attackers to authenticate with revoked client certificates. The OpenSSL and OpenSSL-FFM TLS paths failed to load the configured CRL into the OpenSSL trust store and enable CRL checking when the server key came from a Java keystore. Exposure requires client-certificate authentication with OpenSSL trust, a keystore-held server key, a configured CRL, and a revoked certificate trusted by the server.

The record

CVE
CVE-2026-73581
Published
Sep 23, 2026
Updated
Sep 23, 2026
Vendor
The Apache Software Foundation
Product
Apache Tomcat
Classifications
CWE-299, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 23, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 23, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=10.1.0-M1 <=10.1.59
  2. Affected versionversion=11.0.0-M1 <=11.0.25
  3. Affected versionversion=8.5.0 <=8.50.100
  4. Affected versionversion=9.0.0.M1 <=9.0.121

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Apache Software Foundation · Apache Tomcatversion=10.1.0-M1 <=10.1.59; version=11.0.0-M1 <=11.0.25; version=8.5.0 <=8.50.100; version=9.0.0.M1 <=9.0.121

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-299Improper Check for Certificate Revocation
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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Technologies

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