CVE-2026-55874: Seaweedfs

High severity, CVSS 7.7. EPSS: 0.6% chance of exploitation in the next 30 days.

SeaweedFS is a distributed storage system. Prior to 4.34, the S3 API gateway does not reject dot-dot path segments in the X-Amz-Copy-Source header used by CopyObject and UploadPartCopy, allowing an authenticated identity scoped to one bucket to read objects from other buckets through server-side copy. This issue is fixed in version 4.34.

Affected products

• Seaweedfs Seaweedfs: before 4.34 (fixed in 4.34)

Published 2026-07-08. Last modified 2026-07-08.