Rust advisories / toolshed
Vulnerability HighRUSTSEC-2020-0136 · toolshed
RUSTSEC-2020-0136: CopyCell lacks bounds on its Send trait allowing for data races
Short answerA security vulnerability in the toolshed crate: CopyCell lacks bounds on its Send trait allowing for data races. High severity (CVSS 8.1). No fixed version: replace the crate or remove the affected code path.
| Crate | toolshed |
|---|---|
| Type | Vulnerability (memory-corruption, thread-safety) |
| Affected versions | Every version. |
| Fixed in | none |
| Severity | High, CVSS 8.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H |
| Published | 2020-11-15 |
| Last changed | 2023-11-08 |
| Also known as | CVE-2020-36456, GHSA-2r6q-6c8c-g762 |
What to do
- Find who pulls it in:
cargo tree -i toolshed. - Avoid the affected API, or replace the crate.
Details from the advisory
CopyCell<T> is a Cell-like type that is implemented for any type T that is Copyable. It's Send trait has no bounds on the contained type.
As not all Copyable types are thread safe, for example non-mutable references implement the Copy trait, it is possible to send references to types with interior mutability such as Cell across threads and cause data races.
References
- Package: crates.io/crates/toolshed
- Advisory: rustsec.org/advisories/RUSTSEC-2020-0136.html
- Report: github.com/ratel-rust/toolshed/issues/12
From the RustSec Advisory Database (CC0-1.0) via the OSV export, downloaded Oct 24, 2026. Severity score computed from the published CVSS vector.
Up next
Are you affected?Check your whole dependency treePaste Cargo.lock: every advisory, for your exact versions.Read it next →Also worth your time
Did this answer your question?