flashplugin: remote code execution

A critical vulnerability (use-after-free in the AS3 ByteArray class) has
been identified in Adobe Flash Player 18.0.0.194 and earlier versions
for Windows, Macintosh and Linux. Successful exploitation could cause a
crash and potentially allow an attacker to take control of the affected
system.

Adobe is aware of reports that an exploit targeting this vulnerability
has been published publicly.