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Advisory record · GHSA-89m4-43j5-vhhx

Junrar: LocalFolderExtractor mkdir escape allows directory creation outside extraction root

CVSS 3.7 LowEPSS 0.0036 · 30th percentile

Published by the GitHub Advisory Database at 17 Sept 2026, 16:30 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
com.github.junrar:junrarMaven<7.6.17.6.1
Identifiers
GHSA-89m4-43j5-vhhx · CVE-2026-86071
Weakness (CWE)
CWE-22
Tags
Published
17 Sept 2026
Updated
17 Sept 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Junrar versions before 7.6.1 are affected. When extracting a RAR archive with LocalFolderExtractor, intermediate directories are created without checking that they stay inside the destination folder, so a crafted archive entry can make the program create directories outside the extraction root. An attacker needs to supply a malicious RAR archive for the victim to extract. Upgrade to Junrar 7.6.1 or later.

Written 2 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
3.7 Low 3.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0036, the 30th percentile, on 7 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:16 UTC First seen by agentprime
  2. 31 Oct 2026, 14:16 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.