CVE-2026-86071: low-severity vulnerability in junrar
Junrar: LocalFolderExtractor mkdir escape allows directory creation outside extraction root
Published · Updated
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8Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 3.7epss 0.4%
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.
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
Affected products
junrar · junrarRelated CVEs — junrar
In the same product, most dangerous first.
CVE-2026-28208MEDIUMJunrar has arbitrary file write due to backslash path traversal bypass in LocalFolderExtractor on Linux/UnixEPSS 14.7%CVE-2026-97370HIGHJunrar: RarVM VM_JMP maxOpCount bypass causes infinite CPU loop during RAR4 extractionEPSS 0.4%CVE-2026-41245MEDIUMJunrar: Path Traversal (Zip-Slip) via Sibling Directory Name PrefixEPSS 0.3%