Diesel's SQLite backend has possible UTF-8 corruption
Affects dieselSource GCVE Database
CVSS 8.7 High : upgrade to 2.3.8 soon.
Data as of 27 Oct 2026, 00:07 UTC
- Patch
- Available – fixed in 2.3.8
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:NWhat to do
Upgrade diesel to 2.3.8.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| crates.iodiesel | Affected
| Fixed in
|
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Description
Diesel uses the `sqlite3_value_text` function to receive strings from SQLite while deserializing query results. We misinterpreted the corresponding [SQLite](https://sqlite.org/c3ref/value_blob.html) documentation that this function always returns a UTF-8 encoded string values as `*const c_char`. Based on that we used `str::from_utf8_unchecked` to construct a Rust string slice without any additional UTF-8 checks in place. It turned out that this function doesn't always return correct UTF-8 strings. For field of the SQLite side storage type `BLOB` this pointer can contain arbitrary bytes, which makes the usage of `str::from_utf8_unchecked` unsound as this violates the safety contract of `str` to only contain valid UTF-8 encoded Strings. ## 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 correctly checks whether the provides byte buffer is actually valid UTF-8, instead of relying on SQLite's documentation. This fix is included in the `2.3.8` release.