Vulnerability 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 Score
HIGH
Related Weaknesses (CWE)
References
- https://github.com/seaweedfs/seaweedfs/commit/29981f8d24a62e9571962c4534fb23c48c
- https://github.com/seaweedfs/seaweedfs/security/advisories/GHSA-fvpg-g364-j8vh
- https://github.com/seaweedfs/seaweedfs/security/advisories/GHSA-fvpg-g364-j8vh
FAQ
What is CVE-2026-77317?
CVE-2026-77317 is a vulnerability with a CVSS score of 8.1 (HIGH). 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 u...
How severe is CVE-2026-77317?
CVE-2026-77317 has been rated HIGH with a CVSS base score of 8.1/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-77317?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.