CVE-2020-36434
Double free in sys-info
An issue was discovered in the sys-info crate before 0.8.0 for Rust. sys_info::disk_info calls can trigger a double free.
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 sys-info crate before 0.8.0 for Rust. sys_info::disk_info calls can trigger a double free.
- Record
CVE-2020-36434- 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 sys-info crate before 0.8.0 for Rust. sys_info::disk_info calls can trigger a double free.
- Record
CVE-2020-36434- Updated
- 2026-11-02
EUVDEUVD-2021-1511 No score
An issue was discovered in the sys-info crate before 0.8.0 for Rust. sys_info::disk_info calls can trigger a double free.
- Record
EUVD-2021-1511- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-2f5j-3mhq-xv58
Double free in sys-info
Affected versions of sys-info use a static, global, list to store temporary disk information while running. The function that cleans up this list, DFCleanup, assumes a single threaded environment and will try to free the same memory twice in a multithreaded environment. This results in consistent double-frees and segfaults when calling sys_info::disk_info from multiple threads at once. The issue was fixed by moving the global variable into a local scope.
- Record
GHSA-2f5j-3mhq-xv58- 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
OSVGHSA-2f5j-3mhq-xv58
Double free in sys-info
Affected versions of sys-info use a static, global, list to store temporary disk information while running. The function that cleans up this list, DFCleanup, assumes a single threaded environment and will try to free the same memory twice in a multithreaded environment. This results in consistent double-frees and segfaults when calling sys_info::disk_info from multiple threads at once. The issue was fixed by moving the global variable into a local scope.
- Record
GHSA-2f5j-3mhq-xv58- 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-2020-0100
Double free when calling `sys_info::disk_info` from multiple threads
Affected versions of sys-info use a static, global, list to store temporary disk information while running. The function that cleans up this list,
DFCleanup, assumes a single threaded environment and will try to free the same memory twice in a multithreaded environment.
This results in consistent double-frees and segfaults when calling sys_info::disk_info from multiple threads at once.
The issue was fixed by moving the global variable into a local scope.
Safer Alternatives:
- Record
RUSTSEC-2020-0100- 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 |
|---|---|---|
| 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-2020-36434 is a critical vulnerability (CVSS 9.8) in Sys-info Project Sys-info, published May 31, 2020. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.23%, the 69th percentile. Fixed in sys-info 0.8.0.
References
rustsec.org/advisories/RUSTSEC-2020-0100.html
raw.githubusercontent.com/rustsec/advisory-db/main/crates/sys-info/RUSTSEC-2020-0100.md
nvd.nist.gov/vuln/detail/CVE-2020-36434
github.com/FillZpp/sys-info-rs/issues/63
crates.io/crates/sys-info