CVE-2020-36438
Data race in tiny_future
An issue was discovered in the tiny_future crate before 0.4.0 for Rust. Future<T> does not have bounds on its Send and Sync traits.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- High
- 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 tiny_future crate before 0.4.0 for Rust. Future<T> does not have bounds on its Send and Sync traits.
- Record
CVE-2020-36438- CVSS 3.1
- 8.1 High
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H - CVSS 2.0
- 6.8 Medium
AV:N/AC:M/Au:N/C:P/I:P/A:P - Weakness
- CWE-362
- Updated
- 2026-11-02
CVE List No score
An issue was discovered in the tiny_future crate before 0.4.0 for Rust. Future<T> does not have bounds on its Send and Sync traits.
- Record
CVE-2020-36438- Updated
- 2026-11-02
EUVDEUVD-2021-1699 No score
An issue was discovered in the tiny_future crate before 0.4.0 for Rust. Future<T> does not have bounds on its Send and Sync traits.
- Record
EUVD-2021-1699- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-fg42-vwxx-xx5j
Data race in tiny_future
tiny_future contains a light-weight implementation of Futures. The Future type it has lacked bound on its Send and Sync traits. This allows for a bug where non-thread safe types such as Cell can be used in Futures and cause data races in concurrent programs. The flaw was corrected in commit c791919 by adding trait bounds to Future's Send and Sync.
- Record
GHSA-fg42-vwxx-xx5j- CVSS 3.1
- 8.1 High
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-119, CWE-362
- Updated
- 2026-11-02
GitHub AdvisoriesGHSA-m296-j53x-xv95
Data races in tiny_future
tiny_future contains a light-weight implementation of Futures. The Future type it has lacked bound on its Send and Sync traits. This allows for a bug where non-thread safe types such as Cell can be used in Futures and cause data races in concurrent programs. The flaw was corrected in commit c791919 by adding trait bounds to Future's Send and Sync.
- Record
GHSA-m296-j53x-xv95- CVSS 3.1
- 8.1 High
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-362
- Updated
- 2026-11-02
OSVGHSA-fg42-vwxx-xx5j
Data race in tiny_future
tiny_future contains a light-weight implementation of Futures. The Future type it has lacked bound on its Send and Sync traits. This allows for a bug where non-thread safe types such as Cell can be used in Futures and cause data races in concurrent programs. The flaw was corrected in commit c791919 by adding trait bounds to Future's Send and Sync.
- Record
GHSA-fg42-vwxx-xx5j- CVSS 3.1
- 8.1 High
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-119, CWE-362
- Updated
- 2026-11-02
OSVGHSA-m296-j53x-xv95
Data races in tiny_future
tiny_future contains a light-weight implementation of Futures. The Future type it has lacked bound on its Send and Sync traits. This allows for a bug where non-thread safe types such as Cell can be used in Futures and cause data races in concurrent programs. The flaw was corrected in commit c791919 by adding trait bounds to Future's Send and Sync.
- Record
GHSA-m296-j53x-xv95- CVSS 3.1
- 8.1 High
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-362
- Updated
- 2026-11-02
OSVRUSTSEC-2020-0118
Future<T> lacks bounds on Send and Sync.
tiny_future contains a light-weight implementation of Futures. The Future
type it has lacked bound on its Send and Sync traits.
This allows for a bug where non-thread safe types such as Cell can be used in
Futures and cause data races in concurrent programs.
The flaw was corrected in commit c791919 by adding trait bounds to Future's
Send and Sync.
- Record
RUSTSEC-2020-0118- CVSS 3.1
- 8.1 High
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H - Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
tiny_futurecrates.io |
before 0.4.0 | 0.4.0 |
tiny_futurecrates.io |
0.0.0-0 up to 0.4.0 | 0.4.0 |
History
| Recorded | Changed | Sources |
|---|---|---|
| facts | ||
| 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-2020-36438 is a high vulnerability (CVSS 8.1) in Tiny Future Project Future, published December 8, 2020. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.77%, the 55th percentile. Fixed in tiny_future 0.4.0.
References
rustsec.org/advisories/RUSTSEC-2020-0118.html
raw.githubusercontent.com/rustsec/advisory-db/main/crates/tiny_future/RUSTSEC-2020-0118.md
nvd.nist.gov/vuln/detail/CVE-2020-36438
github.com/KizzyCode/tiny_future/issues/1