It was discovered that dpkg-deb (a component of dpkg, the Debian package management system) does not properly validate the end of the data stream when uncompressing a zstd-compressed .deb archive, which may result in denial of service (infinite loop spinning the CPU).
https://git.dpkg.org/cgit/dpkg/dpkg.git/commit/?id=6610297a62c0780dd0e80b0e302ef64fdcc9d313