Logback: Incomplete protection against 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 1.6.4. This vulnerability is similar to CVE-2026-19880 but involves other attack techniques.
CVE-2026-104721
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-104721
Logback-classic
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"vendor": "QOS.CH Sarl",
"modules": [
"logback-classic"
],
"product": "Logback-classic",
"versions": [
{
"status": "affected",
"version": "0.9.14",
"versionType": "maven",
"lessThanOrEqual": "1.6.4"
},
{
"status": "unaffected",
"version": "1.6.5",
"versionType": "maven"
}
],
"platforms": [
"Java"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-104721
Source reference:
/cveMetadata/cveId
Publisher severity
medium
Source reference: /containers/cna/metrics
- Event
- #7926 · Revision 1
- Added to Heist Feed
- Publisher date