{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-77763",
        "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
        "state": "PUBLISHED",
        "assignerShortName": "VulnCheck",
        "dateReserved": "2026-08-21T10:30:49.467Z",
        "datePublished": "2026-08-21T11:05:13.650Z",
        "dateUpdated": "2026-08-21T21:44:37.044Z"
    },
    "containers": {
        "cna": {
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                "orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
                "shortName": "VulnCheck",
                "dateUpdated": "2026-08-21T11:05:13.650Z"
            },
            "datePublic": "2026-08-15T00:00:00.000Z",
            "title": "JuiceFS Local Filestore Backend Joins Object Keys onto the Storage Root Without a Containment Check, Allowing Writes Outside the Configured Directory",
            "descriptions": [
                {
                    "lang": "en",
                    "value": "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."
                }
            ],
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "lang": "en",
                            "description": "Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')",
                            "cweId": "CWE-22",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "affected": [
                {
                    "vendor": "juicedata",
                    "product": "juicefs",
                    "defaultStatus": "unaffected",
                    "repo": "https://github.com/juicedata/juicefs",
                    "collectionURL": "https://proxy.golang.org",
                    "packageName": "github.com/juicedata/juicefs",
                    "packageURL": "pkg:golang/github.com/juicedata/juicefs",
                    "versions": [
                        {
                            "version": "0",
                            "lessThanOrEqual": "1.4.1",
                            "status": "affected",
                            "versionType": "semver"
                        }
                    ],
                    "programFiles": [
                        "pkg/object/file.go"
                    ]
                }
            ],
            "cpeApplicability": [
                {
                    "nodes": [
                        {
                            "operator": "OR",
                            "negate": false,
                            "cpeMatch": [
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:a:juicedata:juicefs:*:*:*:*:*:*:*:*",
                                    "versionEndIncluding": "1.4.1"
                                }
                            ]
                        }
                    ]
                }
            ],
            "metrics": [
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                    "format": "CVSS",
                    "cvssV3_1": {
                        "version": "3.1",
                        "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N",
                        "attackVector": "NETWORK",
                        "attackComplexity": "LOW",
                        "privilegesRequired": "NONE",
                        "userInteraction": "REQUIRED",
                        "scope": "UNCHANGED",
                        "confidentialityImpact": "NONE",
                        "integrityImpact": "HIGH",
                        "availabilityImpact": "NONE",
                        "baseScore": 6.5,
                        "baseSeverity": "MEDIUM"
                    }
                },
                {
                    "format": "CVSS",
                    "cvssV4_0": {
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                        "attackVector": "NETWORK",
                        "attackComplexity": "LOW",
                        "attackRequirements": "NONE",
                        "privilegesRequired": "NONE",
                        "userInteraction": "PASSIVE",
                        "vulnConfidentialityImpact": "NONE",
                        "vulnIntegrityImpact": "HIGH",
                        "vulnAvailabilityImpact": "NONE",
                        "subConfidentialityImpact": "NONE",
                        "subIntegrityImpact": "NONE",
                        "subAvailabilityImpact": "NONE",
                        "baseScore": 7.1,
                        "baseSeverity": "HIGH"
                    }
                }
            ],
            "references": [
                {
                    "url": "https://github.com/juicedata/juicefs/issues/7401",
                    "tags": [
                        "issue-tracking"
                    ],
                    "name": "GitHub Issue #7401"
                },
                {
                    "url": "https://github.com/juicedata/juicefs/commit/0bcd70b3d13088d38127d6fb5750c91be7c4ec16",
                    "tags": [
                        "patch"
                    ],
                    "name": "object/file: reject object keys that escape the filestore root (#7425)"
                },
                {
                    "url": "https://github.com/juicedata/juicefs/pull/7425",
                    "tags": [
                        "issue-tracking"
                    ],
                    "name": "GitHub Pull Request #7425"
                },
                {
                    "url": "https://github.com/juicedata/juicefs/blob/v1.4.1/pkg/object/file.go",
                    "tags": [
                        "technical-description"
                    ],
                    "name": "filestore path() without a containment check at v1.4.1"
                },
                {
                    "url": "https://github.com/juicedata/juicefs",
                    "tags": [
                        "product"
                    ]
                },
                {
                    "name": "VulnCheck Advisory: JuiceFS Local Filestore Backend Joins Object Keys onto the Storage Root Without a Containment Check, Allowing Writes Outside the Configured Directory",
                    "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"
                }
            ],
            "credits": [
                {
                    "lang": "en",
                    "value": "George Chen",
                    "type": "reporter"
                }
            ],
            "x_generator": {
                "engine": "vulncheck-endgame"
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        },
        "adp": [
            {
                "metrics": [
                    {
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                            "type": "ssvc",
                            "content": {
                                "timestamp": "2026-08-21T21:32:48.194454Z",
                                "id": "CVE-2026-77763",
                                "options": [
                                    {
                                        "Exploitation": "none"
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                                    {
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                                        "Technical Impact": "partial"
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                                ],
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                                "version": "2.0.3"
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                "title": "CISA ADP Vulnrichment",
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                    "dateUpdated": "2026-08-21T21:44:37.044Z"
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}