CVE-2026-46690

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

State: Published
Severity: 5.8 Medium
Published: Jun 12, 2026
Updated: Jun 12, 2026
Reserved: May 15, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	5.8 Medium	CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:H	GitHub_M

Weaknesses

CWE-125 Out-of-bounds Read
CWE-415 Double Free
CWE-704 Incorrect Type Conversion or Cast
CWE-787 Out-of-bounds Write

Affected Products

Product	Versions
unbounded-spscspearman	<= 0.2.0Affected

References

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

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