Rust advisories / lmdb-rs
Unsound MediumRUSTSEC-2023-0047 · lmdb-rs
RUSTSEC-2023-0047: impl `FromMdbValue` for bool is unsound
Short answerlmdb-rs has an API that can cause undefined behaviour from safe code: impl `FromMdbValue` for bool is unsound. No fixed version yet.
| Crate | lmdb-rs |
|---|---|
| Type | Unsound |
| Affected versions | Every version. |
| Fixed in | none |
| Severity | Medium (GitHub rating) |
| Published | 2023-06-26 |
| Last changed | 2023-11-08 |
| Also known as | GHSA-f9g6-fp84-fv92 |
What to do
- Find who pulls it in:
cargo tree -i lmdb-rs. - Avoid the affected API, or replace the crate.
Details from the advisory
The implementation of FromMdbValue have several unsoundness issues. First of all, it allows to reinterpret arbitrary bytes as a bool and could make undefined behavior happen with safe function. Secondly, it allows transmuting pointer without taking memory layout into consideration. The details of reproducing the bug were included in url above.
References
- Package: crates.io/crates/lmdb-rs
- Advisory: rustsec.org/advisories/RUSTSEC-2023-0047.html
- Report: github.com/vhbit/lmdb-rs/issues/67
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?