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

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Summary

CVECVE-2026-46690
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-12 16:16:29 UTC
Updated2026-06-12 17:16:23 UTC
Descriptionunbounded_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.

Risk And Classification

Primary CVSS: v3.1 5.8 MEDIUM from [email protected]

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

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

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary5.8MEDIUMCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:H
3.1CNADECLARED5.8MEDIUMCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:H

CVSS v3.1 Breakdown

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

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Spearman Unbounded-spsc affected <= 0.2.0 Not specified

References

ReferenceSourceLinkTags
github.com/spearman/unbounded-spsc/security/advisories/GHSA-6m57-8r3p-pqx6 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com
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