CVE-2026-13006 Incomplete protection against CVE-2025-11226

What is CVE-2026-13006?

CVE-2026-13006 is a high-severity code injection vulnerability in QOS.CH Sarl Logback-core, published on 24 Jun 2026. It can only be exploited from the same machine or local network, with no action from the victim.

Official 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.

Weakness: CWE-20

Which versions are affected by CVE-2026-13006?

How do I fix CVE-2026-13006?

Upgrade to a fixed version.

Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.

Is CVE-2026-13006 being exploited?

There is no known exploitation of CVE-2026-13006 in the wild and no public exploit code.

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as CLEANSTART-2026-GB27003, CLEANSTART-2026-SP20154, CLEANSTART-2026-XN09213, DEBIAN-CVE-2026-13006, GHSA-567r-vvh5-jjr8, UBUNTU-CVE-2026-13006 and 1 more.