GHSA-VC2M-HW89-QJXF matrix-media-repo (MMR) allows denial of service/high operating costs through unauthenticated downloads

Impact MMR before version 1.3.5 is vulnerable to unbounded disk consumption, where an unauthenticated adversary can induce it to download and cache large amounts of remote media files. MMR's typical operating environment uses S3-like storage as a backend, with file-backed store as an alternative...