CVE-2026-46690: Spearman Unbounded-Spsc

Medium severity, CVSS 5.8. EPSS: 0.1% chance of exploitation in the next 30 days.

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.

Affected products

• Spearman Unbounded-Spsc: up to and including 0.2.0

Published 2026-06-12. Last modified 2026-06-17.