---
id: CVE-2025-11226
title: >-
  ACE vulnerability in conditional configuration file processing  by QOS.CH
  logback-core up to and including version 1.5.18 in Java applications, allows
  an attacker to execute arbitrary code by compromising an existing logback
  configuratio…
summary: >-
  ACE vulnerability in conditional configuration file processing  by QOS.CH
  logback-core up to and including version 1.5.18 in Java applications, allows
  an attacker to execute arbitrary code by compromising an existing logback
  configuratio…
severity: none
cwe:
  - CWE-20
published: '2025-10-01'
updated: '2026-06-25'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-11226'
references:
  - url: 'https://logback.qos.ch/news.html#1.3.16'
    label: vulnerability@ncsc.ch
  - url: 'https://logback.qos.ch/news.html#1.5.19'
    label: vulnerability@ncsc.ch
tags:
  - nvd
epss: 0.00194
epssPercentile: 0.07989
ingestedAt: '2026-06-26T16:43:13.610Z'
---

## Overview

ACE vulnerability in conditional configuration file processing  by QOS.CH logback-core up to and including version 1.5.18 in Java applications, allows an attacker to execute arbitrary code 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 and Spring Framework 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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.