The MITRE CVE dictionary describes this issue as:
gpgv in GnuPG before 220.127.116.11, when using unattended signature verification, returns a 0 exit code in certain cases even when the detached signature file does not carry a signature, which could cause programs that use gpgv to assume that the signature verification has succeeded. Note: this also occurs when running the equivalent command "gpg --verify".
Find out more about CVE-2006-0455 from the
MITRE CVE dictionary dictionary and