CVE-2026-34487
Description
A flaw was found in Apache Tomcat. The cloud membership for clustering component was vulnerable to the insertion of sensitive information into log files. This vulnerability could lead to the exposure of the Kubernetes bearer token, which is a credential used for authentication within a Kubernetes cluster, potentially allowing unauthorized access to cluster resources.
Statement
Low impact. This vulnerability in Apache Tomcat affects the cloud membership for clustering component, potentially exposing Kubernetes bearer tokens in log files. Exploitation requires the cloud membership feature to be enabled and an attacker to have access to the system's log files. Red Hat Enterprise Linux versions are affected if running Apache Tomcat with this specific clustering configuration.
Mitigation
Disable the cloud membership for clustering feature in Apache Tomcat if it is not actively used. Additionally, ensure that access to Apache Tomcat log files is strictly controlled and limited to authorized personnel only to prevent unauthorized disclosure of sensitive information. If the cloud membership for clustering feature is disabled, a restart of the Apache Tomcat service may be required for the changes to take effect.
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 | 6.5 | N/A | 7.5 |
| Attack Vector | Local | N/A | Network |
| Attack Complexity | Low | N/A | Low |
| Privileges Required | Low | N/A | None |
| User Interaction | None | N/A | None |
| Scope | Changed | N/A | Unchanged |
| Confidentiality | High | N/A | High |
| Integrity Impact | None | N/A | None |
| Availability Impact | None | N/A | None |
Vector
Red Hat: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
cve.org: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Understanding the Weakness (CWE)
Confidentiality
Technical Impact: Read Files or Directories
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