The rpmpkgRead function in lib/package.c in RPM 4.10.x before 4.10.2 does not return an error code in certain situations involving an "unparseable signature," which allows remote attackers to bypass RPM signature checks via a crafted package.
https://exchange.xforce.ibmcloud.com/vulnerabilities/80953
https://bugzilla.novell.com/show_bug.cgi?id=796375
http://www.ubuntu.com/usn/USN-1694-1
http://www.securityfocus.com/bid/57138
http://www.openwall.com/lists/oss-security/2013/01/03/9
http://secunia.com/advisories/51706