RUSTSEC-2026-0134
Unsound access to padding bytes while serializing date/time values using the Mysql backend
Diesel relies on libmysqlclient for interacting with Mysql compatible databases. This library requires to provide date/time values according to the byte layout of their MYSQL_TIME type.
Diesel replicated this type as #[repr(C)] struct, populated all the fields of this struct and then casted this value to an array of bytes. As this cast exposes padding bytes contained in this struct, this is undefined behaviour.
This vulnerability affects any user serializing date/time values using the Mysql backend.
Mitigation
The preferred mitigation to the outlined problem is to update to Diesel version 2.3.8 or newer, which includes fixes for the problem.
Resolution
Diesel now manually serializes the relevant data without accessing the padding bytes.
What each source reports
OSV No score
Unsound access to padding bytes while serializing date/time values using the Mysql backend
Diesel relies on libmysqlclient for interacting with Mysql compatible databases. This library requires to provide date/time values according to the byte layout of their MYSQL_TIME type.
Diesel replicated this type as #[repr(C)] struct, populated all the fields of this struct and then casted this value to an array of bytes. As this cast exposes padding bytes contained in this struct, this is undefined behaviour.
This vulnerability affects any user serializing date/time values using the Mysql backend.
Mitigation
The preferred mitigation to the outlined problem is to update to Diesel version 2.3.8 or newer, which includes fixes for the problem.
Resolution
Diesel now manually serializes the relevant data without accessing the padding bytes.
- Record
RUSTSEC-2026-0134- Updated
- 2026-11-02
Affected packages
| Package | Affected | Fixed |
|---|---|---|
dieselcrates.io |
0.0.0-0 up to 2.3.8 | 2.3.8 |
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
RUSTSEC-2026-0134 is a vulnerability with no CVSS score yet in diesel, published April 24, 2026. No source lists public exploit code. Fixed in diesel 2.3.8.