CVE-2021-31996
Double free in algorithmica
An issue was discovered in the algorithmica crate through 2021-03-07 for Rust. There is a double free in merge_sort::merge().
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
- None
- Integrity
- None
- Availability
- High
Exploit likelihood
What each source reports
NVD Score used
An issue was discovered in the algorithmica crate through 2021-03-07 for Rust. There is a double free in merge_sort::merge().
- Record
CVE-2021-31996- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - CVSS 2.0
- 5.0 Medium
AV:N/AC:L/Au:N/C:N/I:N/A:P - Weakness
- CWE-415
- Updated
- 2026-11-02
CVE List No score
An issue was discovered in the algorithmica crate through 2021-03-07 for Rust. There is a double free in merge_sort::merge().
- Record
CVE-2021-31996- Updated
- 2026-11-02
EUVDEUVD-2021-1775 No score
An issue was discovered in the algorithmica crate through 2021-03-07 for Rust. There is a double free in merge_sort::merge().
- Record
EUVD-2021-1775- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-jh37-772x-4hpw
Double free in algorithmica
An issue was discovered in the algorithmica crate through 2021-03-07 for Rust. In the affected versions of this crate, merge_sort::merge() wildly duplicates and drops ownership of T without guarding against double-free. Due to such implementation, simply invoking merge_sort::merge() on Vec<T: Drop> can cause double free bugs.
- Record
GHSA-jh37-772x-4hpw- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-415
- Updated
- 2026-11-02
OSVGHSA-jh37-772x-4hpw
Double free in algorithmica
An issue was discovered in the algorithmica crate through 2021-03-07 for Rust. In the affected versions of this crate, merge_sort::merge() wildly duplicates and drops ownership of T without guarding against double-free. Due to such implementation, simply invoking merge_sort::merge() on Vec<T: Drop> can cause double free bugs.
- Record
GHSA-jh37-772x-4hpw- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-415
- Updated
- 2026-11-02
OSVRUSTSEC-2021-0053 No score
'merge_sort::merge()' crashes with double-free for `T: Drop`
In the affected versions of this crate, merge_sort::merge() wildly duplicates and drops ownership of T without guarding against double-free. Due to such implementation,
simply invoking merge_sort::merge() on Vec<T: Drop> can cause double free bugs.
- Record
RUSTSEC-2021-0053- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
algorithmicacrates.io |
through 0.1.8 | None known |
algorithmicacrates.io |
0.0.0-0 and later | None known |
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-2021-31996 is a high vulnerability (CVSS 7.5) in Algorithmica Project Algorithmica, published March 7, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.96%, the 61st percentile. No source names a fixed version.