This indicates an attack attempt to exploit a Buffer Overflow vulnerability in GNU Image Manipulation Program (GIMP).
The vulnerability is due to an error when the vulnerable software handles a maliciously crafted XWD file. A remote attacker may be able to exploit this to execute arbitrary code within the context of the application, via a crafted XWD file.
GNU GIMP Prior to 2.8.2-2
System Compromise: Remote attackers can gain control of vulnerable systems.
Apply patch available from the website.