unbounded_spsc is an "unbounded" extension of bounded_spsc_queue. In versions 0.2.0 and prior, sender::send pointer-as-value transmute causes OOB read and fake-Arc drop under TX/RX race. At time of publication, there are no publicly available patches.
Exploitability
AV:LAC:HPR:LUI:NScope
S:UImpact
C:LI:LA:H5.8/CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:HMemory Safety