CVE-2026-77368

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Source

https://cve.org/CVERecord?id=CVE-2026-77368

Import Source

https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-77368.json

JSON Data

https://api.osv.dev/v1/vulns/CVE-2026-77368

Aliases

GHSA-99q7-x53r-6j4g

Published

2026-08-26T21:07:57.105Z

Modified

2026-08-28T03:47:18.939966036Z

Severity

7.6 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:L CVSS Calculator

Summary

SeaweedFS: Authenticated Cross-Prefix IDOR in Filer TUS Handler Enables Arbitrary Write to Tenant-Forbidden Paths

Details

SeaweedFS is a distributed storage system for files and blobs. In version 4.39, the filer's TUS resumable-upload handler checks JWT allowed_prefixes scoping only when a session is created, letting a low-privilege tenant hijack another tenant's upload session to write content to filer paths their own token forbids. The HEAD, PATCH, and DELETE verbs that act on an existing session by its id never verify that the session's stored target path falls within the caller's allowed prefixes, so a tenant who obtains another upload's session identifier can PATCH attacker bytes into it and, on completion, have the file land at the victim's out-of-scope path. The same token can also DELETE other tenants' sessions and HEAD them to read upload progress and size, defeating the JWT prefix isolation. This vulnerability only affects deployments that configure filer JWT signing and have TUS uploads enabled. This issue is fixed in version 4.40.

Database specific

{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/77xxx/CVE-2026-77368.json",
    "cwe_ids": [
        "CWE-639"
    ],
    "cna_assigner": "GitHub_M"
}

References

Affected packages

Git / github.com/seaweedfs/seaweedfs

Affected ranges

Type

GIT

Repo

https://github.com/seaweedfs/seaweedfs

Events

Introduced

db42bb49757b459551607939807017d7a9d5a94a

Fixed

ce82e3a057080162a9fba11889157d2255815f71

Fixed

fa549e9c83b7799d512157d728f52052912831af

Database specific

Show details

{
    "source": [
        "AFFECTED_FIELD",
        "REFERENCES"
    ],
    "extracted_events": [
        {
            "introduced": "4.39"
        },
        {
            "fixed": "4.40"
        }
    ]
}

Affected versions

4.*

4.39

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-77368.json"