RUSTSEC-2026-0135 Unsound transmute while debug/display printing batch Insert statements in Diesel's SQLite backend
Unsound transmute in Diesel's SQLite backend during debug printing can cause undefined behavior, potentially leading to crashes or code execution.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Not stated
- Victim action needed
- Not needed
- Fix
- Available
What is RUSTSEC-2026-0135?
RUSTSEC-2026-0135 is a memory corruption vulnerability in diesel, published on 24 Apr 2026.
Official description
Diesel allows users to output the generated SQL for any query DSL construct via th diesel::debug_query function as Display and Debug output.
For the particular implementation used by batch Insert statements in the SQLite backend Diesel relied on an unspecified transmute between types with a #[repr(rust)] layout. This is formally undefined behaviour as the compiler is free to change the layout of these types at any time.
This vulnerability affects users that print out batch insert statements constructed using an array/vector of values without default values using diesel::debug_query on the SQLite 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 uses a sound cast instead.
Which versions are affected by RUSTSEC-2026-0135?
1 open source package ship an affected version, including diesel.
| Package | Affected | Fixed in |
|---|---|---|
diesel crates.io | From 0.0.0-0 | 2.3.8 |
How do I fix RUSTSEC-2026-0135?
Upgrade diesel to 2.3.8 or later.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is RUSTSEC-2026-0135 being exploited?
There is no known exploitation of RUSTSEC-2026-0135 in the wild and no public exploit code.