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CVE-2026-77763— JuiceFS Local Filestore Backend Joins Object Keys onto the Storage Root Without a Containment Check, Allowing Writes Outside the Configured Directory

Quick assessment

Affected
juicedata juicefs
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

JuiceFS是JuiceFS公司开源的一款基于对象存储的分布式文件系统软件。 JuiceFS 1.4.1及之前版本存在路径遍历漏洞，该漏洞源于pkg/object/file.go中的filestore后端未验证路径是否仍在根目录下，导致路径遍历，可能允许攻击者将内容写入预期本地目标之外的路径。

CVSS 6.5 · Medium EPSS 0.50% · P42

Affected Version Matrix 1

VendorProduct Version RangeStatus
juicedata juicefs ≤ 1.4.1 affected
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I. Basic Information for CVE-2026-77763

Vulnerability Information
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Vulnerability Title
JuiceFS Local Filestore Backend Joins Object Keys onto the Storage Root Without a Containment Check, Allowing Writes Outside the Configured Directory
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5
Vulnerability Title
JuiceFS 路径遍历漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
JuiceFS是JuiceFS公司开源的一款基于对象存储的分布式文件系统软件。 JuiceFS 1.4.1及之前版本存在路径遍历漏洞，该漏洞源于pkg/object/file.go中的filestore后端未验证路径是否仍在根目录下，导致路径遍历，可能允许攻击者将内容写入预期本地目标之外的路径。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
juicedata juicefs 0 ~ 1.4.1 -

II. Public POCs for CVE-2026-77763

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III. Intelligence Information for CVE-2026-77763

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Patches & Fixes for CVE-2026-77763 (2)

Vendor Advisories for CVE-2026-77763 (1)

Proof of Concept for CVE-2026-77763 (1)

Other References for CVE-2026-77763 (1)

IV. Related Vulnerabilities

Same product: juicefs
Same vendor: juicedata
Same weakness: CWE-22

V. Comments for CVE-2026-77763

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