CVE-2026-13006

Summary

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 Software

Weaknesses

• CWE-20: CWE-20 Improper Input Validation

Workarounds

Remove Janino from the Java classpath or update to logack version 1.5.37 or later. As of logback 1.5.20, the <condition> element with a custom PropertyEvaluator offers a recommended alternative to conditionals requiring Janino.

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: no
  • Technical Impact: total

References

• https://logback.qos.ch/news.html#1.5.37

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