Schroot before 1.6.13 had too permissive rules on chroot or session names, allowing a denial of service on the schroot service for all users that may start a schroot session.
https://security.gentoo.org/glsa/202210-11
https://lists.debian.org/debian-security-announce/2022/msg00182.html
https://lists.debian.org/debian-lts-announce/2022/08/msg00007.html
https://codeberg.org/shelter/reschroot/commit/6f7166a285e1e97aea390be633591f9791b29a6d