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Tomcat CVE-2026-34500

| EUVDEUVD-2026-21059 MEDIUM
Improper Authentication (CWE-287)
2026-04-09 apache GHSA-24j9-x2wg-9qv6
Apache Tomcat Authentication Bypass Red Hat Suse
6.5
CVSS 3.1 · NVD
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Severity by source

NVD PRIMARY
6.5 MEDIUM
AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N
SUSE
MEDIUM
qualitative
Red Hat
5.9 MEDIUM
qualitative

Primary rating from NVD.

CVSS VectorNVD

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
Low
Availability
None

Lifecycle Timeline

4
Patch released
Apr 11, 2026 - 02:30 nvd
Patch available
EUVD ID Assigned
Apr 09, 2026 - 20:15 euvd
EUVD-2026-21059
Analysis Generated
Apr 09, 2026 - 20:15 vuln.today
CVE Published
Apr 09, 2026 - 19:36 nvd
MEDIUM 6.5

DescriptionCVE.org

CLIENT_CERT authentication does not fail as expected for some scenarios when soft fail is disabled and FFM is used in Apache Tomcat.

This issue affects Apache Tomcat: from 11.0.0-M14 through 11.0.20, from 10.1.22 through 10.1.53, from 9.0.92 through 9.0.116.

Users are recommended to upgrade to version 11.0.21, 10.1.54 or 9.0.117, which fixes the issue.

AnalysisAI

CLIENT_CERT authentication bypass in Apache Tomcat allows unauthenticated remote attackers to bypass certificate-based authentication when soft fail is disabled and Foreign Function Memory (FFM) is enabled, affecting Tomcat 9.0.92-9.0.116, 10.1.22-10.1.53, and 11.0.0-M14-11.0.20. The vulnerability has a CVSS score of 6.5 with high confidentiality impact and partial integrity impact; however, the EPSS score of 0.04% (11th percentile) indicates very low real-world exploitation probability, and no public exploit code or confirmed active exploitation has been identified.

Technical ContextAI

Apache Tomcat's CLIENT_CERT authentication mechanism validates client SSL/TLS certificates during the handshake phase. The vulnerability occurs specifically when FFM (Foreign Function Memory) integration is used-a mechanism that allows Tomcat to invoke native code for enhanced cryptographic operations-and the soft fail policy is disabled. Under these conditions, the authentication validation logic fails to properly enforce certificate requirements, falling back to unauthenticated access instead of rejecting the connection. The root cause maps to CWE-287 (Improper Authentication), indicating a flaw in the authentication logic itself rather than a cryptographic weakness. The attack requires network access to a Tomcat instance with CLIENT_CERT authentication and FFM enabled, but does not require user interaction or high attack complexity beyond the specific configuration prerequisite.

RemediationAI

Vendor-released patch: upgrade to Apache Tomcat 9.0.117, 10.1.54, or 11.0.21 corresponding to your current major version. For organizations unable to patch immediately, implement the following workarounds: (1) disable FFM integration by removing or commenting out FFM-related configuration in catalina.properties or the Connector configuration, reverting to standard Java cryptography; (2) enable soft fail mode in the CLIENT_CERT authentication handler to allow graceful fallback to other authentication methods rather than bypassing authentication entirely; or (3) use network or application-level controls to restrict CLIENT_CERT requests to trusted internal networks only. Refer to the Apache Tomcat security advisory at https://lists.apache.org/thread/7rcl4zdxryc8hy3htyfyxkbqpxjtfdl2 for patched version details and configuration guidance.

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Vendor StatusVendor

SUSE

Severity: Medium
Product Status
openSUSE Tumbleweed Fixed
SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS Affected
SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS Affected
SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS Affected
SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS Affected

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CVE-2026-34500 vulnerability details – vuln.today
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