Unsound MediumRUSTSEC-2022-0020 · crossbeam
RUSTSEC-2022-0020: `SegQueue` creates zero value of any type
Short answercrossbeam has an API that can cause undefined behaviour from safe code: `SegQueue` creates zero value of any type. Fixed in 0.7.0.
| Crate | crossbeam |
|---|---|
| Type | Unsound |
| Affected versions | Before 0.7.0. |
| Fixed in | 0.7.0 |
| Severity | Medium (GitHub rating) |
| Published | 2022-05-10 |
| Last changed | 2023-11-08 |
| Also known as | GHSA-8gj8-hv75-gp94 |
What to do
- See which version you have:
cargo tree -i crossbeam(it also shows which of your dependencies pulls it in). - Update within your version requirement:
cargo update -p crossbeam. If the fix is a newer major or minor than your requirement allows, raise it in Cargo.toml (for examplecrossbeam = "0.7.0") or update the dependency that pulls it in. - Check again with
cargo audit, or paste your Cargo.lock into our Cargo.toml checker.
Details from the advisory
Affected versions of this crate called mem::zeroed() to create values of a user-supplied type T. This is unsound e.g. if T is a reference type (which must be non-null).
The flaw was corrected by avoiding the use of mem::zeroed(), using MaybeUninit instead.
References
- Package: crates.io/crates/crossbeam
- Advisory: rustsec.org/advisories/RUSTSEC-2022-0020.html
- Web: github.com/crossbeam-rs/crossbeam/pull/458
From the RustSec Advisory Database (CC0-1.0) via the OSV export, downloaded Oct 24, 2026. Severity score computed from the published CVSS vector.
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