CVE-2020-35858
Out of bounds write in prost
An issue was discovered in the prost crate before 0.6.1 for Rust. There is stack consumption via a crafted message, causing a denial of service (e.g., x86) or possibly remote code execution (e.g., ARM).
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 prost crate before 0.6.1 for Rust. There is stack consumption via a crafted message, causing a denial of service (e.g., x86) or possibly remote code execution (e.g., ARM).
- Record
CVE-2020-35858- 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-787
- Updated
- 2026-11-02
CVE List No score
An issue was discovered in the prost crate before 0.6.1 for Rust. There is stack consumption via a crafted message, causing a denial of service (e.g., x86) or possibly remote code execution (e.g., ARM).
- Record
CVE-2020-35858- Updated
- 2026-11-02
EUVDEUVD-2021-1729 No score
An issue was discovered in the prost crate before 0.6.1 for Rust. There is stack consumption via a crafted message, causing a denial of service (e.g., x86) or possibly remote code execution (e.g., ARM).
- Record
EUVD-2021-1729- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-gv73-9mwv-fwgq
Out of bounds write in prost
Affected versions of this crate contained a bug in which decoding untrusted input could overflow the stack. On architectures with stack probes (like x86), this can be used for denial of service attacks, while on architectures without stack probes (like ARM) overflowing the stack is unsound and can result in potential memory corruption (or even RCE).
- Record
GHSA-gv73-9mwv-fwgq- 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-787
- Updated
- 2026-11-02
OSV
An issue was discovered in the prost crate before 0.6.1 for Rust. There is stack consumption via a crafted message, causing a denial of service (e.g., x86) or possibly remote code execution (e.g., ARM).
- Record
CVE-2020-35858- 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-gv73-9mwv-fwgq
Out of bounds write in prost
Affected versions of this crate contained a bug in which decoding untrusted input could overflow the stack. On architectures with stack probes (like x86), this can be used for denial of service attacks, while on architectures without stack probes (like ARM) overflowing the stack is unsound and can result in potential memory corruption (or even RCE).
- Record
GHSA-gv73-9mwv-fwgq- 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-787
- Updated
- 2026-11-02
OSVRUSTSEC-2020-0002
Parsing a specially crafted message can result in a stack overflow
Affected versions of this crate contained a bug in which decoding untrusted input could overflow the stack.
On architectures with stack probes (like x86), this can be used for denial of service attacks, while on architectures without stack probes (like ARM) overflowing the stack is unsound and can result in potential memory corruption (or even RCE).
The flaw was quickly corrected by @danburkert and released in version 0.6.1.
- Record
RUSTSEC-2020-0002- 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-2020-35858 is a critical vulnerability (CVSS 9.8) in Prost Project Prost, published January 16, 2020. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 3.40%, the 88th percentile. Fixed in prost 0.6.1.