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Fencer Vulns
medium 5.9

CVE-2026-28208 json

Junrar has arbitrary file write due to backslash path traversal bypass in LocalFolderExtractor on Linux/Unix

published 2026-02-26 8 mo ago modified 2026-06-17 4 mo ago also GHSA-j273-m5qq-6825 , EUVD-2026-8909

cvss
5.9
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
14.7%
EPSS 14.7% chance of exploitation in 30 days, percentile 96%
public exploits
0
none known

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.

Patch / fix

  • maven com.github.junrar:junrar 7.5.8
  • junrar_project junrar 7.5.8

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-28208 updated cvss 5.9

com.github.junrar/junrar: Junrar: Remote code execution via path traversal when extracting crafted RAR archives

  • Red Hat Fuse 7 junrar Red Hat JBoss Enterprise Application Platform 8 junrar Red Hat JBoss Enterprise Application Platform Expansion Pack junrar
    affected: workaround, no fix available “Fix deferred”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
total
Assessed
8 mo ago

Exploit prediction

14.74% chance of exploitation in the next 30 days, higher than 96% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/junrar/junrar/security/advisories/GHSA-j273-m5qq-6825 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
GitHub 3.1 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

Affected packages

ecosystem package affected fixed in
maven com.github.junrar:junrar
<7.5.8
7.5.8

Affected products

  • junrar junrar

Classification

Weakness
  • CWE-22 Improper Limitation of a Pathname to a Restricted Directory

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.