CVE-2026-53434
Description
A flaw was found in Apache Tomcat. When configuring Certificate Revocation Lists (CRLs) for a FFM (presumably a specific type of connector), the system fails to detect and act upon an error condition. This oversight could lead to unexpected behavior or a security bypass, as the intended security controls might not be properly enforced.
Statement
A flaw in Apache Tomcat's FFM-based connector causes errors loading configured Certificate Revocation Lists (CRLs) to be ignored, which could allow certificates that should be rejected to be accepted. Upstream affected versions are 9.0.83 through 9.0.118, 10.1.0-M7 through 10.1.55, and 11.0.0-M1 through 11.0.22. The affected path requires the FFM connector and CRL-based certificate revocation checking with invalid CRL data.
Mitigation
This vulnerability only affects Tomcat deployments using the FFM-based connector (requires Java 22+) with CRL-based certificate revocation checking. Deployments using the standard NIO/NIO2 connectors or not using CRL checking are not affected.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 3.7 | N/A | 9.1 |
| Attack Vector | Network | N/A | Network |
| Attack Complexity | High | N/A | Low |
| Privileges Required | None | N/A | None |
| User Interaction | None | N/A | None |
| Scope | Unchanged | N/A | Unchanged |
| Confidentiality | None | N/A | High |
| Integrity Impact | Low | N/A | High |
| Availability Impact | None | N/A | None |
Vector
Red Hat: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
cve.org: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Understanding the Weakness (CWE)
Integrity,Other
Technical Impact: Varies by Context; Unexpected State; Alter Execution Logic
An attacker could utilize an ignored error condition to place the system in an unexpected state that could lead to the execution of unintended logic and could cause other unintended behavior.
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