Path Traversal Vulnerability in SeaweedFS S3 API Gateway
CVE-2026-55874

7.7HIGH

Key Information:

Vendor

Seaweedfs

Status
Seaweedfs
Vendor
CVE Published:
8 July 2026

What is CVE-2026-55874?

SeaweedFS, a distributed storage system, has a significant vulnerability in its S3 API gateway. Prior to version 4.34, the gateway fails to properly handle dot-dot path segments in the X-Amz-Copy-Source header during operations such as CopyObject and UploadPartCopy. This oversight allows an authenticated user, who is normally restricted to a single bucket, to read objects from other buckets. Consequently, this may expose sensitive data inadvertently, leading to unauthorized access. The issue has been addressed in version 4.34, and it is crucial for users to update promptly to mitigate potential risks.

Affected Version(s)

seaweedfs < 4.34

References

https://github.com/seaweedfs/seaweedfs/security/advisorie...
x_refsource_CONFIRM
https://github.com/seaweedfs/seaweedfs/pull/9929
x_refsource_MISC
https://github.com/seaweedfs/seaweedfs/commit/b44cf51fe93...
x_refsource_MISC

CVSS V3.1

Score:
7.7
Severity:
HIGH
Confidentiality:
High
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.