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.
References
Configurations
No configuration.
History
16 Oct 2026, 13:10
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Information
Published : 2026-08-21 11:17
Updated : 2026-10-16 15:10
NVD link : CVE-2026-77763
Mitre link : CVE-2026-77763
CVE.ORG link : CVE-2026-77763
JSON object : View
Products Affected
No product.
CWE
CWE-22
Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')