Is CVE-2026-55874 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-55874?

CVE-2026-55874 has a CVSS v3 severity of HIGH (7.7).

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CVE-2026-55874

Description

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.