How severe is CVE-2026-46690?

CVE-2026-46690 has a CVSS 3.x base score of 5.8, rated medium severity. It is exploitable over local access with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability high.

Is CVE-2026-46690 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (3rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-46690?

CVE-2026-46690 affects Spearman Unbounded-spsc. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-46690?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-46690 have an EU (EUVD) identifier?

Yes. CVE-2026-46690 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-36469.

When was CVE-2026-46690 published?

CVE-2026-46690 was published on 2026-06-12 and last updated on 2026-06-17.

CVE-2026-46690

CVE-2026-46690 is a medium-severity vulnerability in Spearman Unbounded-spsc with a CVSS 3.x base score of 5.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-125.

Key facts

Severity: Medium (CVSS 3.x base score 5.8)
EPSS exploit prediction: 0% (3rd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-36469
Weakness: CWE-125
Affected product: Spearman Unbounded-spsc
Published: 2026-06-12
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-46690?: 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.
How severe is CVE-2026-46690?: CVE-2026-46690 has a CVSS 3.x base score of 5.8, rated medium severity. It is exploitable over local access with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability high.
Is CVE-2026-46690 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (3rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-46690?: CVE-2026-46690 affects Spearman Unbounded-spsc. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-46690?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-46690 have an EU (EUVD) identifier?: Yes. CVE-2026-46690 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-36469.
When was CVE-2026-46690 published?: CVE-2026-46690 was published on 2026-06-12 and last updated on 2026-06-17.

References

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

Affected products (1)

cpe:2.3:a:spearman:unbounded-spsc:*:*:*:*:*:*:*:*

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