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CVE-2026-86071— Junrar: LocalFolderExtractor mkdir escape allows directory creation outside extraction root

Quick assessment

Affected
junrar junrar
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Junrar is an open source Java RAR archive library. Prior to version 7.6.1, LocalFolderExtractor in src/main/java/com/github/junrar/LocalFolderExtractor.java can create directories outside the intended extraction root when processing a crafted archive entry. Lo

CVSS 3.7 · Low

Affected Version Matrix 1

VendorProduct Version RangeStatus
junrar junrar < 7.6.1 affected
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I. Basic Information for CVE-2026-86071

Vulnerability Information

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Vulnerability Title
Junrar: LocalFolderExtractor mkdir escape allows directory creation outside extraction root
Source: CVE Program / CVE List V5
Vulnerability Description
Junrar is an open source Java RAR archive library. Prior to version 7.6.1, LocalFolderExtractor in src/main/java/com/github/junrar/LocalFolderExtractor.java can create directories outside the intended extraction root when processing a crafted archive entry. LocalFolderExtractor.createFile() validates only the final canonical file path, while LocalFolderExtractor.makeFile() creates intermediate path segments with unchecked mkdir() calls. An entry can therefore make the final path resolve inside the destination while causing intermediate directory creation outside it, enabling filesystem pollution or file-versus-directory squatting that can make later security-sensitive writes fail. The demonstrated impact is directory creation, not unconditional arbitrary file-content write. This issue is fixed in version 7.6.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
junrar junrar < 7.6.1 -

II. Public POCs for CVE-2026-86071

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III. Intelligence Information for CVE-2026-86071

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Patches & Fixes for CVE-2026-86071 (1)

Other References for CVE-2026-86071 (2)

IV. Related Vulnerabilities

Same product: junrar
Same vendor: junrar
Same weakness: CWE-22

V. Comments for CVE-2026-86071

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