CVE-2026-13006

/// Technical description

ACE vulnerability in conditional configuration file processing by QOS.CH logback-core up to and including version 1.5.36 in Java applications, allows an attacker to execute arbitrary code circumventing existing protections against CVE-2025-11226 by compromising an existing logback configuration file or by injecting an environment variable before program execution.

A successful attack requires the presence of Janino library to be present on the user's class path. In addition, the attacker must  have write access to a

configuration file. Alternatively, the attacker could inject a malicious

environment variable pointing to a malicious configuration file. In both

cases, the attack requires existing privilege.

Please note that in logack version 1.5.37 conditional processing using Janino was removed.

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References