CVE-2020-35876
Use after free in rio
An issue was discovered in the rio crate through 2020-05-11 for Rust. A struct can be leaked, allowing attackers to obtain sensitive information, cause a use-after-free, or cause a data race.
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 rio crate through 2020-05-11 for Rust. A struct can be leaked, allowing attackers to obtain sensitive information, cause a use-after-free, or cause a data race.
- Record
CVE-2020-35876- 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-416, CWE-772
- Updated
- 2026-11-02
CVE List No score
An issue was discovered in the rio crate through 2020-05-11 for Rust. A struct can be leaked, allowing attackers to obtain sensitive information, cause a use-after-free, or cause a data race.
- Record
CVE-2020-35876- Updated
- 2026-11-02
EUVDEUVD-2021-1647 No score
An issue was discovered in the rio crate through 2020-05-11 for Rust. A struct can be leaked, allowing attackers to obtain sensitive information, cause a use-after-free, or cause a data race.
- Record
EUVD-2021-1647- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-8rc5-mr4f-m243
Use after free in rio
An issue was discovered in the rio crate through 2020-05-11 for Rust. A struct can be leaked, allowing attackers to obtain sensitive information, cause a use-after-free, or cause a data race.
- Record
GHSA-8rc5-mr4f-m243- 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-416, CWE-772
- Updated
- 2026-11-02
OSVGHSA-8rc5-mr4f-m243
Use after free in rio
An issue was discovered in the rio crate through 2020-05-11 for Rust. A struct can be leaked, allowing attackers to obtain sensitive information, cause a use-after-free, or cause a data race.
- Record
GHSA-8rc5-mr4f-m243- 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-416, CWE-772
- Updated
- 2026-11-02
OSVRUSTSEC-2020-0021
rio allows a use-after-free buffer access when a future is leaked
When a rio::Completion is leaked, its drop code will not run. The drop code
is responsible for waiting until the kernel completes the I/O operation into, or
out of, the buffer borrowed by rio::Completion. Leaking the struct will allow
one to access and/or drop the buffer, which can lead to a use-after-free,
data races or leaking secrets.
Upstream is not interested in fixing the issue.
- Record
RUSTSEC-2020-0021- 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
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-2020-35876 is a critical vulnerability (CVSS 9.8) in Rio Project Rio, published May 11, 2020. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.56%, the 75th percentile. No source names a fixed version.