A bug found in libksba, the library used by GnuPG for parsing the ASN.1 structures as used by S/MIME. The bug affects all versions of Libksba before 1.6.2 and may be used for remote code execution.
https://www.gnupg.org/blog/20221017-pepe-left-the-ksba.html https://dev.gnupg.org/T6230 https://dev.gnupg.org/rK4b7d9cd4a018898d7714ce06f3faf2626c14582b https://lwn.net/Articles/911467/