CVE-2022-23639: crossbeam-utils provides atomics, synchronization primitives, scoped threads, and other utilities for concurre

Q: How do I fix CVE-2022-23639?

crossbeam: upgrade to 0.8.7. Exact commands for each OS are on this page.

Q: Is CVE-2022-23639 being exploited?

CVE-2022-23639 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-2022-23639 affect?

CVE-2022-23639 affects crossbeam. Severity is high (CVSS 8.1). crossbeam-utils provides atomics, synchronization primitives, scoped threads, and other utilities for concurrent programming in Rust. crossbeam-utils prior to version 0.8.7 incorrectly assumed that the alignment of `{i,u}64` was always the

Q: How urgent is CVE-2022-23639?

Priority 56/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

HIGH 8.1REMOTEUPGRADE

CVE-2022-23639 is a high-severity flaw (CVSS 8.1) affecting crossbeam. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

crossbeam-utils provides atomics, synchronization primitives, scoped threads, and other utilities for concurrent programming in Rust. crossbeam-utils prior to version 0.8.7 incorrectly assumed that the alignment of `{i,u}64` was always the same as `Atomic{I,U}64`. However, the alignment of `{i,u}64` on a 32-bit target can be smaller than `Atomic{I,U}64`. This can cause unaligned memory accesses and data race. Crates using `fetch_*` methods with `

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	8.1 (High)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	1.2% (top 31%)
CISA exploited list	No
Weakness	CWE-362
Published	2022-02-15
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: crossbeam project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2022-02-15 19:15 UTCPublished CVE record published
2026-06-17 04:30 UTCUpdated Record last modified

crossbeam project crossbeam UPGRADE

Affected: < 0.8.7

Fixed in: 0.8.7

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy crossbeam || rpm -q crossbeam || crossbeam --version

2. UPGRADE to 0.8.7 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade crossbeam

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade crossbeam

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-2022-23639?

crossbeam: upgrade to 0.8.7. Exact commands for each OS are on this page.

Is CVE-2022-23639 being exploited?

CVE-2022-23639 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-2022-23639 affect?

CVE-2022-23639 affects crossbeam. Severity is high (CVSS 8.1). crossbeam-utils provides atomics, synchronization primitives, scoped threads, and other utilities for concurrent programming in Rust. crossbeam-utils prior to version 0.8.7 incorrectly assumed that the alignment of `{i,u}64` was always the

How urgent is CVE-2022-23639?

Priority 56/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2021-32810 CRITICAL 9.8 UPGRADE MITIGATE crossbeam-deque is a package of work-stealing deques for building task schedulers when programming in Rust

References

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