CVE-2026-1225 (Medium) detected in logback-core-1.2.9.jar

[mend-bolt-for-github]

CVE-2026-1225 - Medium Severity Vulnerability

Vulnerable Library - logback-core-1.2.9.jar

logback-core module

Library home page: http://www.qos.ch

Path to dependency file: /src/examples/JavaSpring/pom.xml

Path to vulnerable library: /home/wss-scanner/.m2/repository/ch/qos/logback/logback-core/1.2.9/logback-core-1.2.9.jar

Dependency Hierarchy:

• spring-boot-starter-2.6.2.jar (Root Library)
  • spring-boot-starter-logging-2.6.2.jar
    • logback-classic-1.2.9.jar
      • ❌ logback-core-1.2.9.jar (Vulnerable Library)

Found in HEAD commit: 642a29f4be078e5094d502da0a4f686426e9309b

Found in base branch: main

Vulnerability Details

ACE vulnerability in configuration file processing by QOS.CH logback-core up to and including version 1.5.24 in Java applications, allows an attacker to instantiate classes already present on the class path by compromising an existing logback configuration file.
The instantiation of a potentially malicious Java class requires that said class is present on the user's class-path. In addition, the attacker must have write access to a
configuration file. However, after successful instantiation, the instance is very likely to be discarded with no further ado.

Publish Date: 2026-01-22

URL: CVE-2026-1225

CVSS 3 Score Details (5.0)

Base Score Metrics:

• Exploitability Metrics:
  • Attack Vector: Local
  • Attack Complexity: High
  • Privileges Required: High
  • User Interaction: None
  • Scope: Changed
• Impact Metrics:
  • Confidentiality Impact: Low
  • Integrity Impact: Low
  • Availability Impact: Low

For more information on CVSS3 Scores, click here.

Suggested Fix

Type: Upgrade version

Release Date: 2026-01-22

Fix Resolution: https://github.com/qos-ch/logback.git - v_1.5.25

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