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PatchSiren cyber security CVE debrief

CVE-2026-46690 spearman CVE debrief

CVE-2026-46690 is a vulnerability in the unbounded_spsc extension of bounded_spsc_queue, affecting versions 0.2.0 and prior. The issue arises from the sender::send pointer-as-value transmute, which causes an out-of-bounds (OOB) read and fake-Arc drop under a TX/RX race condition. At the time of publication, there are no publicly available patches for this vulnerability.

Vendor
spearman
Product
unbounded-spsc
CVSS
MEDIUM 5.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-12
Original CVE updated
2026-06-16
Advisory published
2026-06-12
Advisory updated
2026-06-16

Who should care

Users of unbounded_spsc version 0.2.0 and prior should be aware of this vulnerability, as it could potentially lead to security issues.

Technical summary

The vulnerability has a CVSS score of 5.8 and is classified as MEDIUM severity. It is related to CWE-125, CWE-415, CWE-704, and CWE-787.

Defensive priority

MEDIUM

Recommended defensive actions

  • Review the GitHub advisory for more information: [ref-4](https://github.com/spearman/unbounded-spsc/security/advisories/GHSA-6m57-8r3p-pqx6)
  • Check the official CVE record: [cve-org](https://www.cve.org/CVERecord?id=CVE-2026-46690)
  • View the NVD detail page: [nvd](https://nvd.nist.gov/vuln/detail/CVE-2026-46690)

Evidence notes

The CVE was published on 2026-06-12T16:16:29.197Z and modified on 2026-06-12T17:16:23.640Z.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-46690 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-46690

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-46690 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-46690

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.