{"affected":[{"defaultStatus":"unaffected","ecosystem":"golang","packageName":"github.com/juicedata/juicefs","product":"juicefs","source":"CNA: VulnCheck","vendor":"juicedata","versions":[{"lessThanOrEqual":"1.4.1","status":"affected","version":"0","versionType":"semver"}]}],"cveId":"CVE-2026-77763","cwes":["CWE-22"],"description":"The filestore backend in pkg/object/file.go, used for file:// stores and as a common juicefs sync destination, derived every operation's target from path(key), which returned either filepath.Join(d.root, key) or filepath.Clean(d.root + key) with no check that the result stayed beneath the root. Put, Get, Head, Delete, Chmod, Chown, Symlink and Readlink all consumed that value directly. Object keys enumerated from a source object store during a sync are not constrained the way local filesystem names are, so a key containing traversal segments causes juicefs to write attacker-supplied content to a path outside the intended local destination, and no error is returned. An operator syncing from a bucket whose contents they do not fully control, such as a shared or public bucket or one an attacker can write to, is therefore exposed to a file write at an attacker-influenced location. The fix changes path() to return an error and rejects any key whose resolved path escapes the root.","epss":{"date":"2026-11-08","percentile":0.42936,"score":0.00498},"exploits":[],"kev":null,"metrics":[{"score":6.5,"severity":"medium","source":"CNA: VulnCheck","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N","version":"3.1"},{"score":7.1,"severity":"high","source":"CNA: VulnCheck","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N","version":"4.0"}],"modifiedAt":1794146936782,"publishedAt":1787310313650,"references":[{"source":"CNA: VulnCheck","tags":["issue-tracking"],"url":"https://github.com/juicedata/juicefs/issues/7401"},{"source":"CNA: VulnCheck","tags":["patch"],"url":"https://github.com/juicedata/juicefs/commit/0bcd70b3d13088d38127d6fb5750c91be7c4ec16"},{"source":"CNA: VulnCheck","tags":["issue-tracking","patch"],"url":"https://github.com/juicedata/juicefs/pull/7425"},{"source":"CNA: VulnCheck","tags":["technical-description"],"url":"https://github.com/juicedata/juicefs/blob/v1.4.1/pkg/object/file.go"},{"source":"CNA: VulnCheck","tags":["product"],"url":"https://github.com/juicedata/juicefs"},{"source":"CNA: VulnCheck","tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/juicefs-local-filestore-backend-joins-object-keys-onto-the-storage-root-without-a-containment-check-allowing-writes-outside-the-configured-directory"}],"remediation":[{"kind":"fix","source":"CNA: VulnCheck","text":"The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.","url":"https://github.com/juicedata/juicefs/commit/0bcd70b3d13088d38127d6fb5750c91be7c4ec16"},{"kind":"fix","source":"CNA: VulnCheck","text":"The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.","url":"https://github.com/juicedata/juicefs/pull/7425"}],"revision":"15f52e682749763811411ee295b6cb7d15df56b46b23589cb866a99ffc8862eb","sources":[{"modifiedAt":1794146936782,"name":"CNA: VulnCheck","retrievedAt":1794151364194,"url":"https://www.cve.org/CVERecord?id=CVE-2026-77763"},{"modifiedAt":null,"name":"FIRST EPSS","retrievedAt":1794151367062,"url":"https://api.first.org/data/v1/epss?cve=CVE-2026-77763"}],"ssvc":{"assessedAt":1787347968194,"automatable":"no","exploitation":"none","source":"ADP: CISA-ADP","technicalImpact":"partial"},"status":"published","title":"JuiceFS Local Filestore Backend Joins Object Keys onto the Storage Root Without a Containment Check, Allowing Writes Outside the Configured Directory","updatedAt":1794151367062}