Juicedata JuiceFS up to 1.4.1 Filestore Backend pkg/object/file.go path key path traversal

Summaryinfo

A vulnerability was found in Juicedata JuiceFS up to 1.4.1 and classified as problematic. This issue affects the function path of the file pkg/object/file.go of the component Filestore Backend. Executing a manipulation of the argument key can lead to path traversal. This vulnerability is registered as CVE-2026-77763. It is possible to launch the attack remotely. No exploit is available.

Detailsinfo

A vulnerability was found in Juicedata JuiceFS up to 1.4.1. It has been declared as problematic. This vulnerability affects the function path of the file pkg/object/file.go of the component Filestore Backend. The manipulation of the argument key with an unknown input leads to a path traversal vulnerability. The CWE definition for the vulnerability is CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. As an impact it is known to affect integrity. CVE summarizes:

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.

The advisory is available at github.com. This vulnerability was named CVE-2026-77763 since 08/21/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 08/21/2026). This vulnerability is assigned to T1006 by the MITRE ATT&CK project.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Vendor

• Juicedata

Name

• JuiceFS

Version

• 1.4.0
• 1.4.1

Website

• Product: https://github.com/juicedata/juicefs/

CPE 2.3info

• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Discussion