# CVE-2026-19880: logback: Path-traversal vulnerability in QOS.CH Sarl Logback-classic on Java (logback-classic module) allows path-traversal vu...

CVE-2026-19880 is fixed in logback on 1 platform by DEBIAN-CVE-2026-19880 (version 1:1.6.3-1), released August 14, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-19880
- Priority: Routine
- CVSS: n/a
- EPSS: 0.0033
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Aug 14, 2026

## Description

Path-traversal vulnerability in QOS.CH Sarl Logback-classic on Java (logback-classic module) allows path-traversal vulnerability. More specifically, an  MDC-based discriminator value flows unsanitized into a nested  FileAppender path, letting an attacker who influences that MDC value  (e.g. via an HTTP header)  create and append log files outside the intended directory.    This issue affects Logback-classic: from 0.9.14 through 1.6.2.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | logback Debian 14 | 1:1.6.3-1 | [DEBIAN-CVE-2026-19880](https://patchblox.com/security/data/fix/linux/debian-cve-2026-19880.md) | Aug 14, 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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