GHSA-q8x8-jrhj-fh9p Diesel: Possible unaligned data access for implementations of `SqliteAggregate`
Unaligned memory access in Diesel's SQLite aggregate implementation can cause crashes or code execution when using custom aligned types.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Not stated
- Victim action needed
- Not needed
- Fix
- Available
What is GHSA-q8x8-jrhj-fh9p?
GHSA-q8x8-jrhj-fh9p is a memory corruption vulnerability in diesel, published on 24 Apr 2026.
Official description
Diesel allows to register custom aggregate SQL functions for SQLite via the SqliteAggregate interface.
To store an instance of the custom aggregate processor Diesel relied on the sqlite3_aggregate_context function provided by sqlite. This function doesn't provide any guarantees about alignment of the returned allocation, which in turn can lead to problems if the type implementing requires a special alignment, e.g. via a custom #[align(x)] attribute on the type implementing this trait. This affects any user of SqliteAggregate that registers the custom aggregate function with an SQLite connection, while using a non-standard alignment on the type implementing this trait.
Mitigation
The preferred mitigation to the outlined problem is to update to a Diesel version 2.3.8 or newer, which includes fixes for the problem.
Resolution
Diesel now allocates the corresponding memory on Rust side to get a correctly aligned allocation.
Which versions are affected by GHSA-q8x8-jrhj-fh9p?
3 open source packages ship an affected version, including diesel.
| Package | Affected | Fixed in |
|---|---|---|
diesel crates.io | All versions | 2.3.8 |
diesel crates.io | All versions | 2.3.8 |
diesel crates.io | From 0.0.0-0 | 2.3.8 |
How do I fix GHSA-q8x8-jrhj-fh9p?
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 GHSA-q8x8-jrhj-fh9p being exploited?
There is no known exploitation of GHSA-q8x8-jrhj-fh9p in the wild and no public exploit code.
Sources
Also known as RUSTSEC-2026-0137.