CVE-2026-46690 PUBLISHED

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

Assigner: GitHub_M
Reserved: 15.05.2026 Published: 12.06.2026 Updated: 12.06.2026

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.

Metrics

CVSS 3.1

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

Attack Vector	Local	Scope	Unchanged
Attack Complexity	High	Confidentiality Impact	Low
Privileges Required	Low	Integrity Impact	Low
User Interaction	None	Availability Impact	High

CVSS 3.1

Product Status

Vendor	spearman
Product	unbounded-spsc
Versions	Version <= 0.2.0 is affected

References

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

Problem Types

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