Vulnerability CriticalRUSTSEC-2021-0030 · scratchpad
RUSTSEC-2021-0030: move_elements can double-free objects on panic
Short answerA security vulnerability in the scratchpad crate: move_elements can double-free objects on panic. Critical severity (CVSS 9.8). Fixed in 1.3.1: update to a fixed version.
| Crate | scratchpad |
|---|---|
| Type | Vulnerability (memory-corruption) |
| Affected versions | Before 1.3.1. |
| Fixed in | 1.3.1 |
| Severity | Critical, CVSS 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| Published | 2021-02-18 |
| Last changed | 2023-11-08 |
| Also known as | CVE-2021-28031, GHSA-3qm2-rfqw-fmrw |
| Affected functions | scratchpad::SliceMoveSource::move_elements |
What to do
- See which version you have:
cargo tree -i scratchpad(it also shows which of your dependencies pulls it in). - Update within your version requirement:
cargo update -p scratchpad. If the fix is a newer major or minor than your requirement allows, raise it in Cargo.toml (for examplescratchpad = "1.3.1") 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
Affected versions of scratchpad used ptr::read to read elements while calling a user provided function f on them.
Since the pointer read duplicates ownership, a panic inside the user provided f function could cause a double free when unwinding.
The flaw was fixed in commit 891561bea by removing the unsafe block and using a plain iterator.
References
- Package: crates.io/crates/scratchpad
- Advisory: rustsec.org/advisories/RUSTSEC-2021-0030.html
- Report: github.com/okready/scratchpad/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.
Other advisories for scratchpad
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