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From: Salvatore Bonaccorso <carnil@debian.org>
To: Debian Bug Tracking System <submit@bugs.debian.org>
Subject: logback: CVE-2026-19880
Message-ID: <178854814561.943002.16821528996186291954.reportbug@eldamar.lan>
X-Mailer: reportbug 13.2.0+nmu1
Date: Fri, 04 Sep 2026 20:55:45 +0200
Delivered-To: submit@bugs.debian.org

Source: logback
Version: 1:1.2.11-6
Severity: important
Tags: security upstream
X-Debbugs-Cc: carnil@debian.org, Debian Security Team <team@security.debian.org>

Hi,

The following vulnerability was published for logback.

CVE-2026-19880[0]:
| 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.


If you fix the vulnerability please also make sure to include the
CVE (Common Vulnerabilities & Exposures) id in your changelog entry.

For further information see:

[0] https://security-tracker.debian.org/tracker/CVE-2026-19880
    https://www.cve.org/CVERecord?id=CVE-2026-19880
[1] https://logback.qos.ch/news.html#1.6.3

Regards,
Salvatore
]