Rust advisories / multi_mut
UnsoundRUSTSEC-2020-0169 · multi_mut
RUSTSEC-2020-0169: multi_mut is Unmaintained
Short answermulti_mut has an API that can cause undefined behaviour from safe code: multi_mut is Unmaintained. No fixed version yet.
| Crate | multi_mut |
|---|---|
| Type | Unsound |
| Affected versions | Every version. |
| Fixed in | none |
| Severity | not scored |
| Published | 2020-02-07 |
| Last changed | 2024-12-04 |
| Also known as | none |
What to do
- Find who pulls it in:
cargo tree -i multi_mut. - Avoid the affected API, or replace the crate.
Details from the advisory
Last release was about 6 years ago.
There is an outstanding soundness issue.
The maintainer has not responded for two years to the existing soundness issue.
Rust compiler has enabled errors relating to LLVM noalias rules and may not compile anymore where as the old compiler versions had turned these off.
The maintainer has stated:
> I will take no responsibility of undefined behaviour possibly caused by this crate.
This crate may or may not be suitable for use anymore given the outstanding issues.
References
- Package: crates.io/crates/multi_mut
- Advisory: rustsec.org/advisories/RUSTSEC-2020-0169.html
- Report: github.com/golddranks/multi_mut/issues/1
- Report: github.com/rust-lang/rust/issues/39155
- Web: www.reddit.com/r/rust/comments/5ofuun/multi_mut_multiple_mutable_references_to_hashmap/
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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