Abstract: This work proposes a proactive reactive scheme to mitigate the effect of random permanent node(s) failure on the Ideal Shortest Path Tree (ISPT) Spreading rules in the Wireless Sensor Networks' (WSNs) Contour Guided Dissemination (CGD) protocol. To prove the efficiency of the scheme, simulations have been conducted using the OMNET++ simulator; the simulation results of this work demonstrate how the random node failures affect/degrade the ISPT performance and how the new Proactive Reactive Mitigation (PRM) scheme reinstates the performance by delivering the messages between contour rows with least message loss rate and without introducing an excessive overhead to the used quality of service metrics: average delay, jitter, and throughput compared with the ISPT; its performance is approximately the same of the ISPT Keywords: WSNs, Node failure, CGD Dissemination Protocol.