CVE-2026-46690: unbounded_spsc is an "unbounded" extension of bounded_spsc_queue

Q: How do I fix CVE-2026-46690?

unbounded-spsc: upgrade to newer than 0.2.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-46690 being exploited?

CVE-2026-46690 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-46690 affect?

CVE-2026-46690 affects unbounded-spsc. Severity is medium (CVSS 5.8). 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 availab

Q: How urgent is CVE-2026-46690?

Priority 26/100. Public exploit reference

Routine

MEDIUM 5.8UPGRADE

CVE-2026-46690 is a medium-severity flaw (CVSS 5.8) affecting unbounded-spsc. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	5.8 (Medium)
Attack vector	Local
Attack complexity	High
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.1% (top 97%)
CISA exploited list	No
Weakness	CWE-125, CWE-415, CWE-704, CWE-787
Published	2026-06-12
Last modified	2026-10-26

Publisher (CNA): GitHub, Inc. · Vendor: spearman

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-06-12 16:16 UTCPublished CVE record published
2026-10-26 11:10 UTCUpdated Record last modified

spearman unbounded-spsc UPGRADE

Affected: <= 0.2.0

Fixed in: newer than 0.2.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy unbounded-spsc || rpm -q unbounded-spsc || unbounded-spsc --version

2. UPGRADE to newer than 0.2.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade unbounded-spsc

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade unbounded-spsc

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-46690?

unbounded-spsc: upgrade to newer than 0.2.0. Exact commands for each OS are on this page.

Is CVE-2026-46690 being exploited?

CVE-2026-46690 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-46690 affect?

CVE-2026-46690 affects unbounded-spsc. Severity is medium (CVSS 5.8). 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 availab

How urgent is CVE-2026-46690?

Priority 26/100. Public exploit reference

References

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