# CVE-2026-1225: logback: ACE vulnerability in configuration file processing  by QOS.CH logback-core up to and including version 1.5.24 in Java...

CVE-2026-1225 is fixed in logback on 1 platform, first by DEBIAN-CVE-2026-1225, released January 22, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-1225
- Priority: Routine
- CVSS: n/a
- EPSS: 0.0016
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jan 22, 2026

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | logback Debian 14 | 1:1.6.3-1 | [DEBIAN-CVE-2026-1225](https://patchblox.com/security/data/fix/linux/debian-cve-2026-1225.md) | Jan 22, 2026 |
| Linux | logback opensuse-leap 15.6 | 1.2.13-150200.3.16.1 | [SUSE-SU-2026:0361-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-0361-1.md) | Feb 2, 2026 |

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Data as of 2026-11-08T19:12:23Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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