CVE-2026-55874

HIGH7.7

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

Published Jul 8, 2026

Modified 1 weeks ago

Details

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.

References

WEB

https://github.com/seaweedfs/seaweedfs/commit/b44cf51fe931bd75aa4d37ae766bea90d7f85ccd

WEB

https://github.com/seaweedfs/seaweedfs/pull/9929

WEB

https://github.com/seaweedfs/seaweedfs/releases/tag/4.34

WEB

https://github.com/seaweedfs/seaweedfs/security/advisories/GHSA-56wq-x3wv-3ff4

ADVISORY

https://www.cve.org/CVERecord?id=CVE-2026-55874

CVSS Analysis