CVE-2026-77317

Received Received - Intake

Path Traversal in SeaweedFS SFTP Server

Publication date: 2026-08-26

Last updated on: 2026-08-26

Assigner: GitHub, Inc.

Description

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.

CVSS Scores

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Meta Information

Published

2026-08-26

Last Modified

2026-08-26

Generated

2026-08-27

AI Q&A

2026-08-27

EPSS Evaluated

N/A

NVD

CVE-2026-77317

Affected Vendors & Products

Vendor	Product	Version / Range
seaweedfs	seaweedfs	From 3.88 (inc) to 4.39 (inc)
seaweedfs	seaweedfs	4.40

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-863	The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check.

Attack-Flow Graph

Executive Summary

This vulnerability in SeaweedFS versions 3.88 through 4.39 allows SFTP users to access unintended paths due to a flawed path permission check. The system compares path permissions using a simple string prefix, so a user allowed access to /tenants/alice can also access /tenants/alice-archive or /tenants/alice2, bypassing intended access boundaries.

Detection Guidance

Check SeaweedFS version with 'weed version' command. If between 3.88 and 4.39, the system is vulnerable. Review SFTP user permissions for path configurations that may allow unintended access to sibling directories.

Impact Analysis

An authenticated low-privilege SFTP user with a root home directory and limited permissions could exploit this to read or overwrite files belonging to other tenants. This could lead to unauthorized data access, data corruption, or data theft within the SeaweedFS storage system.

Compliance Impact

This vulnerability could violate compliance requirements by allowing unauthorized access to sensitive data, potentially breaching GDPR's data protection principles or HIPAA's privacy and security rules. Unauthorized data exposure may result in regulatory penalties or legal consequences.

Mitigation Strategies

Upgrade SeaweedFS to version 4.40 or later immediately. Review and tighten SFTP user path permissions to ensure no unintended access to sibling directories. Remove root home directory access for low-privilege users if configured.

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