CVE-2021-28031
move_elements can double-free objects on panic
An issue was discovered in the scratchpad crate before 1.3.1 for Rust. The move_elements function can have a double-free upon a panic in a user-provided f function.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
NVD Score used
An issue was discovered in the scratchpad crate before 1.3.1 for Rust. The move_elements function can have a double-free upon a panic in a user-provided f function.
- Record
CVE-2021-28031- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - CVSS 2.0
- 7.5 High
AV:N/AC:L/Au:N/C:P/I:P/A:P - Weakness
- CWE-415
- Updated
- 2026-11-02
CVE List No score
An issue was discovered in the scratchpad crate before 1.3.1 for Rust. The move_elements function can have a double-free upon a panic in a user-provided f function.
- Record
CVE-2021-28031- Updated
- 2026-11-02
EUVDEUVD-2022-2235 No score
An issue was discovered in the scratchpad crate before 1.3.1 for Rust. The move_elements function can have a double-free upon a panic in a user-provided f function.
- Record
EUVD-2022-2235- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-3qm2-rfqw-fmrw
move_elements can double-free objects on panic
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.
- Record
GHSA-3qm2-rfqw-fmrw- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-415
- Updated
- 2026-11-02
OSV
An issue was discovered in the scratchpad crate before 1.3.1 for Rust. The move_elements function can have a double-free upon a panic in a user-provided f function.
- Record
CVE-2021-28031- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Updated
- 2026-11-02
OSVGHSA-3qm2-rfqw-fmrw
move_elements can double-free objects on panic
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.
- Record
GHSA-3qm2-rfqw-fmrw- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-415
- Updated
- 2026-11-02
OSVRUSTSEC-2021-0030
move_elements can double-free objects on panic
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.
- Record
RUSTSEC-2021-0030- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
scratchpadcrates.io |
before 1.3.1 | 1.3.1 |
scratchpadcrates.io |
0.0.0-0 up to 1.3.1 | 1.3.1 |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-28031 is a critical vulnerability (CVSS 9.8) in Scratchpad Project Scratchpad, published February 18, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.36%, the 71st percentile. Fixed in scratchpad 1.3.1.