A PGP signature verification bypass has been found in fwupd prior to 1.4.0, and in libjcat <= 0.1.2. The issue is that if a detached signature is actually a PGP message, gpgme_op_verify() returns the rather perplexing GPG_ERR_NO_ERROR, and then gpgme_op_verify_result() builds an empty list.
A PGP signature verification bypass has been found in fwupd prior to 1.4.0, and in libjcat <= 0.1.2. The issue is that if a detached signature is actually a PGP message, gpgme_op_verify() returns the rather perplexing GPG_ERR_NO_ERROR, and then gpgme_op_verify_result() builds an empty list.
https://github.com/hughsie/libjcat/commit/839b89f
Vulmon