CVE-2026-19880

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.