The GIF encoder in Byzanz allows remote attackers to cause a denial of service (out-of-bounds heap write and crash) or possibly execute arbitrary code via a crafted Byzanz debug data recording (ByzanzRecording file) to the byzanz-playback command.
Improper Restriction of Operations within the Bounds of a Memory Buffer The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary.