This indicates an attack attempt to exploit a Buffer Overflow vulnerability in GNU Image Manipulation
The vulnerability is due to an insufficient validation error on certain fields when the vulnerable software handles a 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 2.8.10 and prior
System Compromise: Remote attackers can gain control of vulnerable systems.
Apply the most recent upgrade or patch from the vendor.