Libgcrypt is a general purpose library of cryptographic building blocks. It is originally based on code used by GnuPG. It does not provide any implementation of OpenPGP or other protocols. Only one released version is affected: – LibgCrypt 1.9.0 (released 2021-01-19) All other versions are not affected. The use of non-released versions in a production environment is strongly discouraged. If you are using the 1.8 LTS branch, please update immediately to version 19.1.0.”]
Source: https://lists.gnupg.org/pipermail/gnupg-announce/2021q1/000456.html