---
id: CVE-2026-77317
title: SeaweedFS is a distributed storage system for files and blobs
summary: >-
  SeaweedFS is a distributed storage system for files and blobs. In versions
  from 3.88 through 4.39, the SFTP server evaluates configured path permissions
  with a literal string-prefix comparison, so a user scoped to a path is also
  granted …
severity: high
cvss: 8.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N'
cwe:
  - CWE-863
published: '2026-08-26'
updated: '2026-09-09'
sourceUpdated: '2026-09-09T21:09:13.080'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-77317'
references:
  - url: >-
      https://github.com/seaweedfs/seaweedfs/commit/29981f8d24a62e9571962c4534fb23c48c00bae2
    label: security-advisories@github.com
  - url: >-
      https://github.com/seaweedfs/seaweedfs/security/advisories/GHSA-fvpg-g364-j8vh
    label: security-advisories@github.com
  - url: >-
      https://github.com/seaweedfs/seaweedfs/security/advisories/GHSA-fvpg-g364-j8vh
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
epss: 0.00363
epssPercentile: 0.27398
ingestedAt: '2026-08-29T21:42:34.955Z'
---

## Overview

SeaweedFS is a distributed storage system for files and blobs. In versions from 3.88 through 4.39, the SFTP server evaluates configured path permissions with a literal string-prefix comparison, so a user scoped to a path is also granted the same access to any sibling path whose name merely begins with the same characters. A user granted access to /tenants/alice therefore also matches /tenants/alice-archive, /tenants/alice2, and similar siblings, because the check does not require a path-component boundary. An authenticated low-privilege SFTP user with a root home directory and narrow path permissions can thereby cross the configured ACL boundary to read another tenant's files, and to overwrite them if granted write, all through the documented SFTP service with its own valid credentials. This issue is fixed in version 4.40.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.