{"apiVersion":"1.0","identifier":"CVE-2026-77763","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.","publishedAt":"2026-08-21T11:17:06","lastModifiedAt":"2026-08-21T22:16:46","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-77763","cvssScore":6.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N","epssProbability":0.00325,"riskScore":0.67,"affectedProduct":"juicefs","affectedVersions":"unknown","vulnerabilityType":"Library","operatingSystems":[],"links":{"self":"https://www.redsauce.net/api/cves/CVE-2026-77763","webPages":{"es":"https://www.redsauce.net/es/cves/CVE-2026-77763","en":"https://www.redsauce.net/en/cves/CVE-2026-77763","fr":"https://www.redsauce.net/fr/cves/CVE-2026-77763","pt":"https://www.redsauce.net/pt/cves/CVE-2026-77763","de":"https://www.redsauce.net/de/cves/CVE-2026-77763","sk":"https://www.redsauce.net/sk/cves/CVE-2026-77763","el":"https://www.redsauce.net/el/cves/CVE-2026-77763"},"source":"https://nvd.nist.gov/vuln/detail/CVE-2026-77763"}}