parcimonie before 0.8.1, when using a large keyring, sleeps for the same amount of time between fetches, which allows attackers to correlate key fetches via unspecified vectors.
https://gaffer.ptitcanardnoir.org/intrigeri/files/parcimonie/App-Parcimonie-0.8.1.tar.gz
https://exchange.xforce.ibmcloud.com/vulnerabilities/91118
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=738134
http://www.securityfocus.com/bid/65505
http://www.debian.org/security/2014/dsa-2860