In builds with PubSub and JSON enabled, a crafted JSON message can cause the decoder to write beyond a heap-allocated array before authentication, reliably crashing the process and corrupting memory.
Exploitability
AV:NAC:LAT:NPR:LUI:AVulnerable System
VC:NVI:NVA:HSubsequent System
SC:NSI:NSA:N6.8/CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:NMemory Safety