QOS.CH Sarl Logback-core up to 1.5.34/1.5.134 Configuration input validation

Summaryinfo

A vulnerability was found in QOS.CH Sarl Logback-core up to 1.5.34/1.5.134. It has been declared as problematic. Affected by this issue is some unknown functionality of the component Configuration Handler. The manipulation results in input validation. This vulnerability is identified as CVE-2026-13006. The attack is only possible with local access. There is not any exploit available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic has been found in QOS.CH Sarl Logback-core up to 1.5.34/1.5.134. Affected is some unknown processing of the component Configuration Handler. The manipulation with an unknown input leads to a input validation vulnerability. CWE is classifying the issue as CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

ACE vulnerability in conditional configuration file processing by QOS.CH logback-core up to and including version 1.5.34 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.

The advisory is shared for download at logback.qos.ch. This vulnerability is traded as CVE-2026-13006 since 06/23/2026. The exploitability is told to be easy. The attack needs to be approached locally. The exploitation needs additional levels of successful authentication. There are neither technical details nor an exploit publicly available.

Upgrading to version 1.5.35 eliminates this vulnerability.

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Productinfo

Vendor

• QOS.CH Sarl

Name

• Logback-core

Version

• 1.5.0
• 1.5.1
• 1.5.2
• 1.5.3
• 1.5.4
• 1.5.5
• 1.5.6
• 1.5.7
• 1.5.8
• 1.5.9
• 1.5.10
• 1.5.11
• 1.5.12
• 1.5.13
• 1.5.14
• 1.5.15
• 1.5.16
• 1.5.17
• 1.5.18
• 1.5.19
• 1.5.20
• 1.5.21
• 1.5.22
• 1.5.23
• 1.5.24
• 1.5.25
• 1.5.26
• 1.5.27
• 1.5.28
• 1.5.29
• 1.5.30
• 1.5.31
• 1.5.32
• 1.5.33
• 1.5.34
• 1.5.134

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