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CVE-2026-104721

Logback: Incomplete protection against CVE-2026-19880

MEDIUM
6.3
CVSS Score
Published: October 2, 2026 at 01:21 PM UTC
Updated: October 2, 2026 at 05:59 PM UTC
1 product affected across 1 vendorLogback-classic

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Severity
MEDIUM6.3
Exploit prediction
EPSS 0.3%

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 1.6.4.  This vulnerability is similar to CVE-2026-19880 but involves other attack techniques.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Logback-classic· Qos Ch Sarl
60%
0.9.14 ≤ v ≤ 1.6.40.9.14
Vendor states this is fixed in 1.6.5 (unaffected)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (1)

Source: cverecord
https://logback.qos.ch/news.html#1.6.5

CVSS

6.3MEDIUMNCSC.ch
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-22

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