Junrar has arbitrary file write due to backslash path traversal bypass in LocalFolderExtractor on Linux/Unix
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- High
- Impact type
- —
- Confidentiality · integrity · availability
- None · High · None
- Fix status
- Partial Red Hat: 3 without a fix
Attack profile from CVSS 3.1 · CNA. Fix status from CNA, GitHub and Red Hat.
Summary
Junrar is an open source java RAR archive library. Prior to version 7.5.8, a backslash path traversal vulnerability in `LocalFolderExtractor` allows an attacker to write arbitrary files with attacker-controlled content anywhere on the filesystem when a crafted RAR archive is extracted on Linux/Unix. This can often lead to remote code execution (e.g., overwriting shell profiles, source code, cron jobs, etc). Version 7.5.8 has a fix for the issue.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- No
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| junrar | junrar | before 7.5.8 | 7.5.8 | Patch available | CNA |
| — | com.github.junrar:junrar (Maven) | before 7.5.8 | 7.5.8 | Patch available | GHSA-j273-m5qq-6825 |
- junrar Vendorjunrar Affected before 7.5.8 Fixed in 7.5.8 Patch available CNA
- com.github.junrar:junrar (Maven) Vendor— Affected before 7.5.8 Fixed in 7.5.8 Patch available GHSA-j273-m5qq-6825
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:junrar_project:junrar:*:*:*:*:*:*:*:* | before 7.5.8 | Vulnerable | Junrar Project |
- cpe:2.3:a:junrar_project:junrar:*:*:*:*:*:*:*:* Versions before 7.5.8 Vulnerable ·Junrar Project
Remediation
- Fix · CNA junrar (junrar) Fixed in 7.5.8
- Fix · GHSA-j273-m5qq-6825 com.github.junrar:junrar (Maven) Fixed in 7.5.8 Advisory →
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Fuse 7 | Affected | No fix yet: Fix deferred |
| Red Hat JBoss Enterprise Application Platform 8 | Affected | No fix yet: Fix deferred |
| Red Hat JBoss Enterprise Application Platform Expansion Pack | Affected | No fix yet: Fix deferred |
Timeline
- 2026-10-02 Threatist record created from CVE-2026-28208
- 2026-10-03 Alias added: GHSA-j273-m5qq-6825
- 2026-10-25 EPSS moved to the 95th–99th percentile
References
More junrar vulnerabilities
- TI-2026-74659 Infinite CPU loop in Junrar RAR4 extraction through RarVM jumps CVSS 3.1HIGH 7.5
- TI-2026-58877 Junrar: LocalFolderExtractor mkdir escape allows directory creation outside extraction root CVSS 3.1LOW 3.7
Sources
- CVE-2026-28208 · CVE Program
- CVE-2026-28208 · NVD
- FIRST EPSS
- GHSA-j273-m5qq-6825 · GitHub Advisory Database · CC BY 4.0
- CVE-2026-28208 · 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