CVE-2026-46690: unbounded-spsc: Sender::send pointer-as-value transmute causes OOB read and fake-Arc drop under TX/RX race

Severity: medium (CVSS 5.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.1% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2026-06-12 · updated 2026-10-26
Weakness: CWE-125

Description

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: through 0.2.0

References

https://github.com/spearman/unbounded-spsc/security/advisories/GHSA-6m57-8r3p-pqx6
https://github.com/spearman/unbounded-spsc/security/advisories/GHSA-6m57-8r3p-pqx6

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