CVE-2026-19880

Incomplete protection against CVE-2025-11226

Published Aug 14, 2026 CVSS 4.0 · 6.3 Medium EPSS < 1% KEV · Not listed
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.

Remediation

Vendor Solution

Update to logack version 1.6.3 or later. This vulnerability requires SiftingAppender to be active as well as unsanitized data provided by an attacker that MDCDiscriminator makes use of.  Sanitizing relevant data provided by the user should fix this vulnerability.


Vendor Workaround

Update to logack version 1.6.3 or later. This vulnerability requires SiftingAppender to be active as well as unsanitized data provided by an attacker that MDCDiscriminator makes use of.

Tracking

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Advisories

No advisories available
References
History
Type Values Removed Values Added
First Time appeared Qos.ch Sarl
Qos.ch Sarl logback-classic
Vendors & Products Qos.ch Sarl
Qos.ch Sarl logback-classic
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
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.
Title Incomplete protection against CVE-2025-11226
Weaknesses CWE-22
References
Metrics cvssV4_0

{'score': 6.3, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/S:P/AU:N/RE:M/U:Green'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
NCSC.ch
Published
Updated
Aug 14, 2026, 7:46 PM
Reserved
Aug 14, 2026, 2:30 PM
Status
Deferred
Published
Aug 14, 2026, 3:17 PM
Modified
Aug 26, 2026, 4:39 PM