Rust advisories / messagepack-rs
Vulnerability CriticalRUSTSEC-2021-0092 · messagepack-rs
RUSTSEC-2021-0092: Deserialization functions pass uninitialized memory to user-provided Read
Short answerA security vulnerability in the messagepack-rs crate: Deserialization functions pass uninitialized memory to user-provided Read. GitHub rates it Critical. No fixed version: replace the crate or remove the affected code path.
| Crate | messagepack-rs |
|---|---|
| Type | Vulnerability (memory-exposure) |
| Affected versions | Every version. |
| Fixed in | none |
| Severity | Critical (GitHub rating) |
| Published | 2021-01-26 |
| Last changed | 2024-03-15 |
| Also known as | CVE-2021-45690, CVE-2021-45691, CVE-2021-45692, CVE-2021-45693, GHSA-hr52-f9vp-582c, GHSA-jqjj-r4qp-x2gh, GHSA-jwfh-j623-m97h, GHSA-m325-rxjv-pwph, GHSA-vw5m-qw2r-m923 |
What to do
- Find who pulls it in:
cargo tree -i messagepack-rs. - Avoid the affected API, or replace the crate.
Details from the advisory
Affected versions of this crate passed an uninitialized buffer to a user-provided Read instance in:
deserialize_binarydeserialize_stringdeserialize_extension_othersdeserialize_string_primitive
This can result in safe Read implementations reading from the uninitialized buffer leading to undefined behavior.
References
- Package: crates.io/crates/messagepack-rs
- Advisory: rustsec.org/advisories/RUSTSEC-2021-0092.html
- Report: github.com/otake84/messagepack-rs/issues/2
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
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