Logback: Incomplete protection against CVE-2026-19880
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- Present
- Impact type
- —
- Confidentiality · integrity · availability
- Low · Low · Low
- Fix status
- Partial Red Hat: 11 without a fix
Attack profile from CVSS 4.0 · CNA. Fix status from CNA and Red Hat.
Summary
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.
Why it matters now
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| QOS.CH Sarl | Logback-classic | 0.9.14 – 1.6.4 | 1.6.5 | Patch available | CNA |
- Logback-classic VendorQOS.CH Sarl Affected 0.9.14 – 1.6.4 Fixed in 1.6.5 Patch available CNA
Remediation
- Fix · CNA Logback-classic (QOS.CH Sarl) Fixed in 1.6.5
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Migration Toolkit for Applications 8 | Affected | No fix yet: Fix deferred |
| OpenShift Serverless | Affected | No fix yet: Fix deferred |
| Red Hat Ceph Storage 9 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 10 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 7 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 8 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 9 | Affected | No fix yet: Fix deferred |
| Red Hat JBoss Web Server 7 | Affected | No fix yet: Fix deferred |
| Red Hat OpenShift Dev Spaces | Affected | No fix yet: Fix deferred |
| Red Hat Satellite 6 | Affected | No fix yet: Fix deferred |
| Red Hat build of Apache Camel - HawtIO 4 | Affected | No fix yet: Fix deferred |
Not affected: 1 product
- Red Hat Hardened Images
Timeline
- 2026-10-02 Threatist record created from CVE-2026-104721
- 2026-10-03 Alias added: GHSA-5f86-rhcp-cxm6
- 2026-10-04 Priority changed: MEDIUM → LOW
References
More QOS.CH Sarl vulnerabilities
- TI-2026-11065 Incomplete protection against CVE-2025-11226 CVSS 4.0HIGH 7.0
- TI-2025-10282 Conditional processing of logback.xml configuration file, in conjuction with Spring Framework and Janino CVSS 4.0HIGH 7.0
- TI-2024-11860 JaninoEventEvaluator vulnerability CVSS 4.0MEDIUM 5.9
- TI-2026-16116 Incomplete protection against CVE-2025-11226 CVSS 4.0MEDIUM 6.3
- TI-2026-09059 Logback deserialization whitelist bypass for Proxy objects CVSS 4.0LOW 2.9
- TI-2026-08607 Logback deserialization whitelist bypass for java.lang and java.util CVSS 4.0LOW 2.9
Sources
- CVE-2026-104721 · CVE Program
- CVE-2026-104721 · NVD
- FIRST EPSS
- GHSA-5f86-rhcp-cxm6 · GitHub Advisory Database · CC BY 4.0
- CVE-2026-104721 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences