CVE-2026-27607 RustFS's Missing Post Policy Validation leads to Arbitrary Object Write

RustFS is a distributed object storage system built in Rust. In versions 1.0.0-alpha.56 through 1.0.0-alpha.82, RustFS does not validate policy conditions in presigned POST uploads PostObject, allowing attackers to bypass content-length-range, starts-with, and Content-Type constraints. This enabl...

CVE-2026-27607

RustFS is affected by a vulnerability in versions 1.0.0-alpha.56 through 1.0.0-alpha.82 where presigned POST uploads (PostObject) do not validate policy conditions. The server bypasses content-length-range, starts-with, and Content-Type constraints, allowing unauthorized file uploads that can exc...