CVE-2026-46690 | BDVDB-2026-339963 Detail

spearmanunbounded-spsc

Description#

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.

Impact#

Per CVSS v3.1: confidentiality impact low, integrity impact low, availability impact high. Attack vector: local.

Weaknesses#

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

References#

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

Exploit#

No public exploit known

History#

Version 12026-06-12Record published in the CVE List.

Published

Published: 2026-06-12
Last modified: 2026-06-12

Vendor information

Vendor: spearman
Product: unbounded-spsc

All spearman vulnerabilities

Score

5.8 Medium

EPSS

less than 1%, Very Low

Estimated chance of exploitation in the next 30 days. EPSS percentile: 2.7.

KEV

Not listed in the CISA Known Exploited Vulnerabilities catalog.

Impact

Memory Corruption

Action

No specific action is recorded in the source data. Check the references for vendor guidance.

Affected Systems

Vulnerable
<= 0.2.0
Fixed
Not stated

Scoring System

CVSS v4.0

Not available

CVSS v3.1

5.8 Medium

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

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

CVSS v3.0

Not available

CVSS v2

Not available

Source: CVE List v5 (record); CISA KEV (kev, action); FIRST EPSS (epss).