CVE-2026-13006: Qos.ch Sarl Logback-Core

High severity, CVSS 7.0. EPSS: 0.2% chance of exploitation in the next 30 days.

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.

Affected products

• Qos.ch Sarl Logback-Core: from 0.9.20, up to and including 1.5.36

Published 2026-06-24. Last modified 2026-07-01.