CVE-2026-46690

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.

CVSS v3 5.8 MEDIUM

5.8^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 1.0 / Impact : 4.7

Attack Vector LOCAL

Attack Complexity HIGH

Privileges Required LOW

User Interaction NONE

Confidentiality Impact LOW

Integrity Impact LOW

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://github.com/spearman/unbounded-spsc/security/advisories/GHSA-6m57-8r3p-pqx6	Exploit Vendor Advisory
https://github.com/spearman/unbounded-spsc/security/advisories/GHSA-6m57-8r3p-pqx6	Exploit Vendor Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:spearman:unbounded-spsc:*:*:*:*:*:*:*:*

History

16 Jun 2026, 00:07

Type	Values Removed	Values Added
First Time		Spearman Spearman unbounded-spsc
CPE		cpe:2.3:a:spearman:unbounded-spsc::::::::
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 - Exploit, Vendor Advisory

12 Jun 2026, 17:16

Type	Values Removed	Values Added
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 -

12 Jun 2026, 16:24

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-06-12 16:16

Updated : 2026-06-17 10:53

NVD link : CVE-2026-46690

Mitre link : CVE-2026-46690

CVE.ORG link : CVE-2026-46690

JSON object : View

Products Affected

spearman

unbounded-spsc

CWE

CWE-125

Out-of-bounds Read

CWE-415

Double Free

CWE-704

Incorrect Type Conversion or Cast

CWE-787

Out-of-bounds Write

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