Rust advisories / ruspiro-singleton
Vulnerability HighRUSTSEC-2020-0115 · ruspiro-singleton
RUSTSEC-2020-0115: Singleton lacks bounds on Send and Sync.
Short answerA security vulnerability in the ruspiro-singleton crate: Singleton lacks bounds on Send and Sync.. High severity (CVSS 8.1). Fixed in 0.4.1: update to a fixed version.
| Crate | ruspiro-singleton |
|---|---|
| Type | Vulnerability (memory-corruption, thread-safety) |
| Affected versions | Before 0.4.1. |
| Fixed in | 0.4.1 |
| 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 | 2020-11-16 |
| Last changed | 2023-11-08 |
| Also known as | CVE-2020-36435, GHSA-fqq2-xp7m-xvm8 |
What to do
- See which version you have:
cargo tree -i ruspiro-singleton(it also shows which of your dependencies pulls it in). - Update within your version requirement:
cargo update -p ruspiro-singleton. If the fix is a newer major or minor than your requirement allows, raise it in Cargo.toml (for exampleruspiro-singleton = "0.4.1") 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
Singleton<T> is meant to be a static object that can be initialized lazily. In order to satisfy the requirement that static items must implement Sync, Singleton implemented both Sync and Send unconditionally.
This allows for a bug where non-Sync types such as Cell can be used in singletons and cause data races in concurrent programs.
The flaw was corrected in commit b0d2bd20e by adding trait bounds, requiring the contaiend type to implement Sync.
References
- Package: crates.io/crates/ruspiro-singleton
- Advisory: rustsec.org/advisories/RUSTSEC-2020-0115.html
- Report: github.com/RusPiRo/ruspiro-singleton/issues/10
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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