gpgv in GnuPG before 1.4.2.1, 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".
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10084
https://exchange.xforce.ibmcloud.com/vulnerabilities/24744
http://www.vupen.com/english/advisories/2006/0610
http://www.us.debian.org/security/2006/dsa-978
http://www.ubuntu.com/usn/usn-252-1
http://www.trustix.org/errata/2006/0008
http://www.slackware.com/security/viewer.php?l=slackware-security&y=2006&m=slackware-security.476477
http://www.securityfocus.com/archive/1/433931/100/0/threaded
http://www.securityfocus.com/archive/1/425289/100/0/threaded
http://www.redhat.com/support/errata/RHSA-2006-0266.html
http://www.openpkg.org/security/OpenPKG-SA-2006.001-gnupg.html
http://www.novell.com/linux/security/advisories/2006_13_gpg.html
http://www.novell.com/linux/security/advisories/2006_09_gpg.html
http://www.novell.com/linux/security/advisories/2006_05_sr.html
http://www.mandriva.com/security/advisories?name=MDKSA-2006:043
http://www.gentoo.org/security/en/glsa/glsa-200602-10.xml
http://secunia.com/advisories/19532
http://secunia.com/advisories/19249
http://secunia.com/advisories/19130
http://secunia.com/advisories/18968
http://secunia.com/advisories/18956
http://secunia.com/advisories/18955
http://secunia.com/advisories/18942
http://secunia.com/advisories/18934
http://secunia.com/advisories/18933
http://secunia.com/advisories/18845
http://marc.info/?l=gnupg-devel&m=113999098729114&w=2
http://lists.gnupg.org/pipermail/gnupg-announce/2006q1/000211.html