CVE-2021-32773

Racket is a general-purpose programming language and an ecosystem for
language-oriented programming. In versions prior to 8.2, code evaluated
using the Racket sandbox could cause system modules to incorrectly use
attacker-created modules instead of their intended dependencies. This could
allow system functions to be controlled by the attacker, giving access to
facilities intended to be restricted. This problem is fixed in Racket
version 8.2. A workaround is available, depending on system settings. For
systems that provide arbitrary Racket evaluation, external sandboxing such
as containers limit the impact of the problem. For multi-user evaluation
systems, such as the handin-server system, it is not possible to work
around this problem and upgrading is required.