{"id":"CVE-2026-85396","aliases":["AZL-99087","DEBIAN-CVE-2026-85396","EUVD-2026-70673","GHSA-47m2-wp7j-p9vc","UBUNTU-CVE-2026-85396"],"status":"published","title":"rubyzip before 3.4.0 Path Traversal in Zip::Entry#extract via Sibling-Directory Prefix","description":"rubyzip versions before 3.4.0 contain a path traversal vulnerability in Zip::Entry#extract that fails to properly validate extraction paths using prefix comparison without trailing separators. Attackers can craft archive entries with names like ../upload_backup/owned.sh to write files outside the intended extraction directory into sibling paths sharing the destination prefix.","severity":{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.00564,"percentile":0.47181,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-22"],"published":"2026-09-03T18:54:27Z","modified":"2026-10-28T02:31:09Z","fixes":[{"ecosystem":"RubyGems","package":"rubyzip","fixed_in":["3.4.0"],"sources":["ghsa","osv"]},{"ecosystem":"Debian:14","package":"ruby-zip","fixed_in":["3.4.0+dfsg-1"],"sources":["osv"]}],"affected":[{"source":"ghsa","ecosystem":"RubyGems","package":"rubyzip","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.4.0"}]}]},{"source":"osv","ecosystem":"Azure Linux:3","package":"rubygem-rubyzip","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"2.3.2-1"}]}]},{"source":"osv","ecosystem":"Debian:12","package":"ruby-zip","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.3.2-1","3.2.2+dfsg-1","3.2.2-1","3.2.2-2","3.4.0+dfsg-1","3.4.1+dfsg-1","3.5.0+dfsg-1","3.7.0+dfsg-1"]},{"source":"osv","ecosystem":"Debian:13","package":"ruby-zip","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.3.2-1","3.2.2+dfsg-1","3.2.2-1","3.2.2-2","3.4.0+dfsg-1","3.4.1+dfsg-1","3.5.0+dfsg-1","3.7.0+dfsg-1"]},{"source":"osv","ecosystem":"Debian:14","package":"ruby-zip","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.4.0+dfsg-1"}]}],"versions":["2.3.2-1","3.2.2+dfsg-1","3.2.2-1","3.2.2-2"]},{"source":"osv","ecosystem":"RubyGems","package":"rubyzip","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.4.0"}]}],"versions":["0.5.11","0.5.12","0.5.7","0.5.8","0.5.9","0.9.1","0.9.4","0.9.5","0.9.6.1","0.9.7","0.9.8","0.9.9","1.0.0","1.0.0.beta1","1.1.0","1.1.1","1.1.2","1.1.3","1.1.4","1.1.5","1.1.6","1.1.7","1.2.0","1.2.1","1.2.2","1.2.3","1.2.4","1.3.0","2.0.0","2.1.0","2.2.0","2.3.0","2.3.1","2.3.2","2.4.1","2.4.rc1","3.0.0","3.0.0.alpha","3.0.0.rc1","3.0.0.rc2","3.0.1","3.0.2","3.1.0","3.1.1","3.2.0","3.2.1","3.2.2","3.3.0","3.3.1"]},{"source":"osv","ecosystem":"Ubuntu:16.04:LTS","package":"ruby-zip","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.1.7-1"]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"ruby-zip","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.2.1-1","1.2.1-1.1~build0.18.04.1"]},{"source":"osv","ecosystem":"Ubuntu:20.04:LTS","package":"ruby-zip","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.2.2-1","2.0.0-2"]},{"source":"osv","ecosystem":"Ubuntu:22.04:LTS","package":"ruby-zip","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.0.0-2","2.3.0-2"]},{"source":"osv","ecosystem":"Ubuntu:24.04:LTS","package":"ruby-zip","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.3.2-1"]},{"source":"osv","ecosystem":"Ubuntu:26.04:LTS","package":"ruby-zip","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.3.2-1","3.2.2-1","3.2.2-2"]}],"products":[{"vendor":"rubyzip","product":"rubyzip"}],"references":[{"url":"https://github.com/rubyzip/rubyzip/commit/17edfbf4423b83211b075acc23a7d8640da63449","tags":["patch","fix","web","report"]},{"url":"https://github.com/rubyzip/rubyzip","tags":["product","package","report"]},{"url":"https://github.com/rubyzip/rubyzip/releases/tag/v3.4.0","tags":["release-notes","advisory","web","report"]},{"url":"https://github.com/rubyzip/rubyzip/blob/v3.3.1/lib/zip/entry.rb","tags":["technical-description","article","web","report"]},{"url":"https://github.com/geo-chen/oss/blob/main/rubyzip.md","tags":["technical-description","article","web","report"]},{"url":"https://www.vulncheck.com/advisories/rubyzip-before-3.4.0-path-traversal-in-zip-entry-extract-via-sibling-directory-prefix","tags":["third-party-advisory","advisory","web","report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-85396","tags":["web","advisory"]},{"url":"https://github.com/rubysec/ruby-advisory-db/blob/master/gems/rubyzip/CVE-2026-85396.yml","tags":["web"]},{"url":"https://github.com/advisories/GHSA-47m2-wp7j-p9vc"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/85xxx/CVE-2026-85396.json","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-85396","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-85396","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-85396","tags":["report"]},{"url":"https://github.com/rubyzip/rubyzip/issues/664","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2026-85396","title":"rubyzip before 3.4.0 Path Traversal in Zip::Entry#extract via Sibling-Directory Prefix","description":"rubyzip versions before 3.4.0 contain a path traversal vulnerability in Zip::Entry#extract that fails to properly validate extraction paths using prefix comparison without trailing separators. Attackers can craft archive entries with names like ../upload_backup/owned.sh to write files outside the intended extraction directory into sibling paths sharing the destination prefix.","status":"published","published":"2026-09-03T18:54:27.903Z","modified":"2026-09-03T19:00:09.867Z","cvss":[{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N","level":"high","assessor":"cna"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high","assessor":"cna"}],"cwes":["CWE-22"],"updated_at":"2026-11-02T14:19:52.410665Z"}],"euvd":[{"id":"EUVD-2026-70673","description":"rubyzip versions before 3.4.0 contain a path traversal vulnerability in Zip::Entry#extract that fails to properly validate extraction paths using prefix comparison without trailing separators. Attackers can craft archive entries with names like ../upload_backup/owned.sh to write files outside the intended extraction directory into sibling paths sharing the destination prefix.","status":"published","published":"2026-09-03T18:54:27Z","modified":"2026-09-03T19:00:09Z","cvss":[{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N","level":"high"}],"updated_at":"2026-11-02T18:01:13.160542Z"}],"ghsa":[{"id":"GHSA-47m2-wp7j-p9vc","title":"rubyzip path traversal vulnerability","description":"rubyzip versions before 3.4.0 contain a path traversal vulnerability in `Zip::Entry#extract` that fails to properly validate extraction paths using prefix comparison without trailing separators. Attackers can craft archive entries with names like `../upload_backup/owned.sh` to write files outside the intended extraction directory into sibling paths sharing the destination prefix.","status":"published","published":"2026-09-03T21:31:16Z","modified":"2026-09-25T19:25:56Z","cvss":[{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N","level":"high"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high"}],"cwes":["CWE-22"],"updated_at":"2026-11-02T14:41:22.654187Z"}],"nvd":[{"id":"CVE-2026-85396","description":"rubyzip versions before 3.4.0 contain a path traversal vulnerability in Zip::Entry#extract that fails to properly validate extraction paths using prefix comparison without trailing separators. Attackers can craft archive entries with names like ../upload_backup/owned.sh to write files outside the intended extraction directory into sibling paths sharing the destination prefix.","status":"published","published":"2026-09-03T19:17:31.527Z","modified":"2026-09-24T20:28:01.78Z","cvss":[{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"high","assessor":"secondary"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high","assessor":"primary"}],"cwes":["CWE-22"],"updated_at":"2026-11-02T14:12:43.737972Z"}],"osv":[{"id":"CVE-2026-85396","title":"rubyzip before 3.4.0 Path Traversal in Zip::Entry#extract via Sibling-Directory Prefix","description":"rubyzip versions before 3.4.0 contain a path traversal vulnerability in Zip::Entry#extract that fails to properly validate extraction paths using prefix comparison without trailing separators. Attackers can craft archive entries with names like ../upload_backup/owned.sh to write files outside the intended extraction directory into sibling paths sharing the destination prefix.","status":"published","published":"2026-09-03T18:54:27.903Z","modified":"2026-10-28T02:31:09.481771023Z","cvss":[{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N","level":"high"}],"cwes":["CWE-22"],"updated_at":"2026-11-02T15:45:18.825071Z"},{"id":"DEBIAN-CVE-2026-85396","description":"rubyzip versions before 3.4.0 contain a path traversal vulnerability in Zip::Entry#extract that fails to properly validate extraction paths using prefix comparison without trailing separators. Attackers can craft archive entries with names like ../upload_backup/owned.sh to write files outside the intended extraction directory into sibling paths sharing the destination prefix.","status":"published","published":"2026-09-03T19:17:31.527Z","modified":"2026-09-25T09:00:22.589657786Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high"}],"updated_at":"2026-11-02T15:46:05.022702Z"},{"id":"GHSA-47m2-wp7j-p9vc","title":"rubyzip path traversal vulnerability","description":"rubyzip versions before 3.4.0 contain a path traversal vulnerability in `Zip::Entry#extract` that fails to properly validate extraction paths using prefix comparison without trailing separators. Attackers can craft archive entries with names like `../upload_backup/owned.sh` to write files outside the intended extraction directory into sibling paths sharing the destination prefix.","status":"published","published":"2026-09-03T21:31:16Z","modified":"2026-09-25T19:45:09.880068387Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high"},{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N","level":"high"}],"cwes":["CWE-22"],"updated_at":"2026-11-02T15:46:36.782754Z"},{"id":"UBUNTU-CVE-2026-85396","description":"rubyzip versions before 3.4.0 contain a path traversal vulnerability in Zip::Entry#extract that fails to properly validate extraction paths using prefix comparison without trailing separators. Attackers can craft archive entries with names like ../upload_backup/owned.sh to write files outside the intended extraction directory into sibling paths sharing the destination prefix.","status":"published","published":"2026-09-03T19:17:00Z","modified":"2026-09-16T11:43:10Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high"},{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N","level":"high"}],"updated_at":"2026-11-02T16:57:24.828975Z"},{"id":"AZL-99087","title":"CVE-2026-85396 affecting package rubygem-rubyzip 2.3.2-1","description":"rubyzip versions before 3.4.0 contain a path traversal vulnerability in Zip::Entry#extract that fails to properly validate extraction paths using prefix comparison without trailing separators. Attackers can craft archive entries with names like ../upload_backup/owned.sh to write files outside the intended extraction directory into sibling paths sharing the destination prefix.","status":"published","published":"2026-09-03T19:17:31Z","modified":"2026-09-08T05:27:28Z","updated_at":"2026-11-02T15:28:12.596039Z"}]}}