Email-Address-List could be made to remotely exhaust resources if it received specially crafted email data.
Ubuntu Linux Distribution - Security Advisories
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PulseAudio could be made to crash or run programs as your login if it received specially crafted input.
xawtv could be made to expose sensitive information and escalate user privileges if it received specially crafted input.
GnuPG could be made to expose sensitive information.
Pure-FTPd could be made to expose sensitive information if it recieved specially crafted input.
