CVE-2019-25004
Unsound casting in flatbuffers
An issue was discovered in the flatbuffers crate before 0.6.1 for Rust. Arbitrary bytes can be reinterpreted as a bool, defeating soundness.
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 flatbuffers crate before 0.6.1 for Rust. Arbitrary bytes can be reinterpreted as a bool, defeating soundness.
- Record
CVE-2019-25004- 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 - Updated
- 2026-11-02
CVE List No score
An issue was discovered in the flatbuffers crate before 0.6.1 for Rust. Arbitrary bytes can be reinterpreted as a bool, defeating soundness.
- Record
CVE-2019-25004- Updated
- 2026-11-02
EUVDEUVD-2021-1734 No score
An issue was discovered in the flatbuffers crate before 0.6.1 for Rust. Arbitrary bytes can be reinterpreted as a bool, defeating soundness.
- Record
EUVD-2021-1734- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-gx73-2498-r55c
Unsound casting in flatbuffers
The implementation of impl Follow for bool allows to reinterpret arbitrary bytes as a bool.
In Rust bool has stringent requirements for its in-memory representation. Use of this function allows to violate these requirements and invoke undefined behaviour in safe code.
- Record
GHSA-gx73-2498-r55c- 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-704
- Updated
- 2026-11-02
OSVGHSA-gx73-2498-r55c
Unsound casting in flatbuffers
The implementation of impl Follow for bool allows to reinterpret arbitrary bytes as a bool.
In Rust bool has stringent requirements for its in-memory representation. Use of this function allows to violate these requirements and invoke undefined behaviour in safe code.
- Record
GHSA-gx73-2498-r55c- 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-704
- Updated
- 2026-11-02
OSVRUSTSEC-2019-0028
Unsound `impl Follow for bool`
The implementation of impl Follow for bool allows to reinterpret arbitrary bytes as a bool.
In Rust bool has stringent requirements for its in-memory representation. Use of this function
allows to violate these requirements and invoke undefined behaviour in safe code.
- Record
RUSTSEC-2019-0028- 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
| Package | Affected | Fixed |
|---|---|---|
flatbufferscrates.io |
0.4.0 up to 0.6.1 | 0.6.1 |
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-2019-25004 is a critical vulnerability (CVSS 9.8) in Google Flatbuffers, published October 20, 2019. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.58%, the 48th percentile. Fixed in flatbuffers 0.6.1.