{"cve":"CVE-2026-86071","nvd":{"published":"2026-09-16T19:17:58.623","modified":"2026-09-24T21:25:27.050","status":"Deferred","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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N","score":3.7},"cwes":["CWE-22"],"references":["https://github.com/junrar/junrar/commit/e6e333b195a1e3ad271a18fd79d8ac1eb5289343","https://github.com/junrar/junrar/releases/tag/v7.6.1","https://github.com/junrar/junrar/security/advisories/GHSA-89m4-43j5-vhhx"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:54:41.405518556+00:00"},"epss":{"cve":"CVE-2026-86071","score":0.00362,"percentile":0.30096,"date":"2026-11-01"},"kev":null,"osv":[{"id":"GHSA-89m4-43j5-vhhx","url":"https://osv.dev/vulnerability/GHSA-89m4-43j5-vhhx","summary":"Junrar: LocalFolderExtractor mkdir escape allows directory creation outside extraction root","modified":"2026-09-17T16:45:06.345577098Z","packages":[{"ecosystem":"Maven","name":"com.github.junrar:junrar","purl":"pkg:maven/com.github.junrar/junrar","ranges":["<7.6.1"],"fixed":["7.6.1"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}