Rust advisories / endian_trait
Vulnerability HighRUSTSEC-2021-0039 · endian_trait
RUSTSEC-2021-0039: panic in user-provided `Endian` impl triggers double drop of T
Short answerA security vulnerability in the endian_trait crate: panic in user-provided `Endian` impl triggers double drop of T. High severity (CVSS 7.5). No fixed version: replace the crate or remove the affected code path.
| Crate | endian_trait |
|---|---|
| Type | Vulnerability (memory-corruption) |
| Affected versions | Every version. |
| Fixed in | none |
| Severity | High, CVSS 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| Published | 2021-01-04 |
| Last changed | 2023-11-08 |
| Also known as | CVE-2021-29929, GHSA-vpw8-43wm-rxw5 |
What to do
- Find who pulls it in:
cargo tree -i endian_trait. - Avoid the affected API, or replace the crate.
Details from the advisory
Affected versions of the crate does not guard against panic from user-provided impl of Endian trait, which is a safe trait that users can implement. If a user-provided implementation of the Endian trait panics, double-drop is triggered due to the duplicated ownership of T created by ptr::read().
Double-drop (or double free) can cause memory corruption in the heap.
References
- Package: crates.io/crates/endian_trait
- Advisory: rustsec.org/advisories/RUSTSEC-2021-0039.html
- Report: gitlab.com/myrrlyn/endian_trait/-/issues/1
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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