CVE-2026-55874

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

CVSS 7.7 HIGHEPSS 0.3%CWE-22

Vexday Risk Score

21Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 7.7EPSS 0.3%KEV nãoPoC —Nuclei —Metasploit —Patch —

Lifecycle

08 Jul 2026Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

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.

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

Affected products

seaweedfs · seaweedfs

References

https://github.com/seaweedfs/seaweedfs/commit/b44cf51fe931bd75aa4d37ae766bea90d7f85ccd https://github.com/seaweedfs/seaweedfs/pull/9929 https://github.com/seaweedfs/seaweedfs/releases/tag/4.34 https://github.com/seaweedfs/seaweedfs/security/advisories/GHSA-56wq-x3wv-3ff4