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CVE-2026-1225— Malicious logback.xml configuration file allows instantiation of arbitrary classes

Quick assessment

Affected
QOS.CH Sarl Logback-core
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

logback-core是QOS.CH开源的一个日志框架的核心模块。 logback-core 1.5.24及之前版本存在安全漏洞，该漏洞源于配置文件处理不当，可能导致攻击者通过篡改现有logback配置文件实例化类路径上的类。

AI Predicted 3.1 Difficulty: Moderate EPSS 0.17% · P5
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I. Basic Information for CVE-2026-1225

Vulnerability Information
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Vulnerability Title
Malicious logback.xml configuration file allows instantiation of arbitrary classes
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:L/AC:H/AT:P/PR:H/UI:N/VC:L/VI:L/VA:L/SC:L/SI:L/SA:L/S:N/AU:N/RE:M/U:Green
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
logback-core 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
logback-core是QOS.CH开源的一个日志框架的核心模块。 logback-core 1.5.24及之前版本存在安全漏洞，该漏洞源于配置文件处理不当，可能导致攻击者通过篡改现有logback配置文件实例化类路径上的类。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
QOS.CH Sarl Logback-core 0.9.20 ~ 1.5.24 -

II. Public POCs for CVE-2026-1225

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III. Intelligence Information for CVE-2026-1225

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Vendor Pages for CVE-2026-1225 (1)

IV. Related Vulnerabilities

Same product: Logback-core
Same vendor: QOS.CH Sarl
Same weakness: CWE-20

V. Comments for CVE-2026-1225

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