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CVE-2026-46690

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

Published: Jun 12, 2026Updated: Jun 12, 2026 Sources: CVE List
NVD MITRE
5.8CVSS
MEDIUM

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.

EPSS Score
0.0%
Top 97.4%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available

CVSS Vector Breakdown

AV:LAC:HPR:LUI:NS:UC:LI:LA:H
Exploitability
AV:LAttack Vector
Local
AC:HAttack Complexity
High
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:LConfidentiality
Low
I:LIntegrity
Low
A:HAvailability
High

Weaknesses

CWE-125CWE-125: Out-of-bounds ReadCWE-415CWE-415: Double FreeCWE-704CWE-704: Incorrect Type Conversion or CastCWE-787CWE-787: Out-of-bounds Write

Affected Products

unbounded-spsc
spearman

Attack Graph

Products CVE Techniques Tactics

Click technique nodes to view MITRE ATT&CK details. Scroll to zoom, drag to pan.

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

MITRE ATT&CK

3 techniques
Collection
Initial Access
Privilege Escalation
View detailed technique mapping

References

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

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