CVE-2026-46690

FAUCET Score

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.

First published: Jun 12, 2026Last modified: Jun 12, 2026

Impacted Technologies

Vendor	Product	Version(s)	CPE
		<= 0.2.0CPE matchmatch criteria	cpe:2.3:a:spearman:unbounded-spsc::::::::

CVSS Data

CVSS version used by this source: 3.1

5.8MEDIUM

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

Attack Vector

LOCAL

Attack Complexity

HIGH

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

LOW

Integrity Impact

LOW

Availability Impact

HIGH

Exploitability Score

1.0

Impact Score

4.7

CvssVersion

3.1

Exploit Intelligence

EPSS Score

0.13%

Probability of exploitation in next 30 days

EPSS Percentile

3.0%

Percentile rank of EPSS score among Peer Group

As of 2026-07-27

Model: v2026.06.15

This CVE's current EPSS score of 0.0013 is in the 25th percentile among its peer group of 1,297 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.4 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Advisories (1)

rustGHSA-6m57-8r3p-pqx6medium

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

May 29, 2026

References

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

ExploitVendor Advisory