CVE-2026-28208 Junrar has arbitrary file write due to backslash path traversal bypass in LocalFolderExtractor on Linux/Unix
Attackers can write arbitrary files via crafted RAR archives in Junrar, potentially leading to remote code execution on Linux/Unix systems.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-28208?
CVE-2026-28208 is a medium-severity path traversal vulnerability in junrar, published on 26 Feb 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-22
Which versions are affected by CVE-2026-28208?
2 open source packages ship an affected version, including com.github.junrar:junrar. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
com.github.junrar:junrar Maven | All versions | 7.5.8 |
com.github.junrar:junrar Maven | All versions | 7.5.8 |
Products include Junrar Project Junrar.
How do I fix CVE-2026-28208?
Upgrade com.github.junrar:junrar to 7.5.8 or later.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-28208 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-28208 exists.
Other vulnerabilities in junrar
Sources
Also known as ECHO-40b2-f523-98e1, GHSA-j273-m5qq-6825.