CVE-2026-54917-SeaweedFS-Cross-Bucket-Traversal

CVE-2026-54917 — SeaweedFS S3 gateway cross-bucket path traversal Proof-of-concept and technical write-up for CVE-2026-54917 , a path-traversal in the SeaweedFS S3 API gateway that lets a caller reach objects in any bucket , regardless of what its credentials are authorized for...

SeaweedFS <= 4.29 - Path Traversal File Write

SeaweedFS versions through 4.29 build the S3 API and Iceberg REST catalog routers with mux.NewRouter.SkipCleantrue, which disables URL path cleaning. A .. segment in the request path therefore survives routing and reaches the handlers unnormalised, so a request such as PUT...

SeaweedFS: Filer JWT allowed_prefixes literal prefix match allows cross-tenant access to sibling paths

Impact When a filer JWT restricts a token to a set of path prefixes via allowedprefixes, the authorization check used a literal byte-prefix match strings.HasPrefix. A token scoped to /tenant1 therefore also authorized requests to sibling paths such as /tenant1234, /tenant1-old, and /tenant1backup...

EUVD-2026-56159

SeaweedFS: Filer JWT allowedprefixes literal prefix match allows cross-tenant access to sibling paths...

EUVD-2026-56156

SeaweedFS: Unauthenticated filer IAM gRPC service grants S3 administrative control...

GHSA-56WQ-X3WV-3FF4 SeaweedFS: Path traversal in the S3 gateway X-Amz-Copy-Source header allows cross-bucket object read

Summary The SeaweedFS S3 API gateway did not reject .. path segments in the X-Amz-Copy-Source header used by CopyObject and UploadPartCopy. The request URL path was hardened against traversal in 4.30 CVE-2026-54917, but the copy-source header was only checked for emptiness, so a .. segment in the...

EUVD-2026-42285

SeaweedFS: Path traversal in the S3 gateway X-Amz-Copy-Source header allows cross-bucket object read...

GHSA-HGPF-8634-G44C SeaweedFS: Improper authorization in the S3Tables / Iceberg REST management API lets a low-privileged S3 user enumerate administrator-owned table buckets

Summary SeaweedFS routes requests signed with SigV4 service s3tables to the S3Tables management API. Authorization on that path collapsed account-less S3 identities into the shared admin account and failed open, so a user holding only ordinary S3 Read credentials — and no S3Tables-specific...

CVE-2026-77611

SeaweedFS is a distributed storage system for files and blobs. In versions prior to 4.40, an authenticated S3 principal with permissions scoped to a nested object key can overwrite a different object outside that scope by calling PutObjectAcl on the key it is allowed to access. The handler...

CVE-2026-77317

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...

CVE-2026-77368

SeaweedFS is a distributed storage system for files and blobs. In version 4.39, the filer's TUS resumable-upload handler checks JWT allowedprefixes 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 o...

CVE-2026-77298

SeaweedFS is a distributed storage system for files and blobs. In versions 4.39 and earlier, the S3 API accepts an external OIDC JWT sent directly in the Authorization header and maps it to an IAM role without enforcing that role's trust policy, so a federated user can assume a role they are not...

CVE-2026-77611

SeaweedFS (a distributed storage system for files and blobs) contains an object-scope bypass in its S3 PutObjectAcl handler, affecting versions prior to 4.40 . An authenticated S3 principal with permissions scoped to a nested key (e.g., allowed/protected.txt) can overwrite a different object outs...

CVE-2026-77611 SeaweedFS: Authenticated S3 object-scope bypass in PutObjectAcl allows overwriting a different object with the same basename

SeaweedFS is a distributed storage system for files and blobs. In versions prior to 4.40, an authenticated S3 principal with permissions scoped to a nested object key can overwrite a different object outside that scope by calling PutObjectAcl on the key it is allowed to access. The handler...

CVE-2026-77611 SeaweedFS: Authenticated S3 object-scope bypass in PutObjectAcl allows overwriting a different object with the same basename

SeaweedFS is a distributed storage system for files and blobs. In versions prior to 4.40, an authenticated S3 principal with permissions scoped to a nested object key can overwrite a different object outside that scope by calling PutObjectAcl on the key it is allowed to access. The handler...

CVE-2026-77317 SeaweedFS: SFTP path ACL literal prefix match permits cross-tenant file read and overwrite

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...

CVE-2026-77317 SeaweedFS: SFTP path ACL literal prefix match permits cross-tenant file read and overwrite

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...

CVE-2026-77317

CVE-2026-77317 affects SeaweedFS (distributed file/blob storage system) versions 3.88 through 4.39. The SFTP server evaluates configured path permissions using a literal string-prefix comparison rather than requiring a path-component boundary. A user scoped to a path such as /tenants/alice is als...

CVE-2026-77298 SeaweedFS S3 OIDC Bearer authentication bypasses IAM role trust policy

SeaweedFS is a distributed storage system for files and blobs. In versions 4.39 and earlier, the S3 API accepts an external OIDC JWT sent directly in the Authorization header and maps it to an IAM role without enforcing that role's trust policy, so a federated user can assume a role they are not...

CVE-2026-77298 SeaweedFS S3 OIDC Bearer authentication bypasses IAM role trust policy

SeaweedFS is a distributed storage system for files and blobs. In versions 4.39 and earlier, the S3 API accepts an external OIDC JWT sent directly in the Authorization header and maps it to an IAM role without enforcing that role's trust policy, so a federated user can assume a role they are not...