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VulnerabilityPublished

Diesel's SQLite backend has possible UTF-8 corruption

Affects dieselSource GCVE Database

0

CVSS 8.7 High : upgrade to 2.3.8 soon.

Data as of 27 Oct 2026, 00:07 UTC

CVSS 4.0 base score
8.7High
How severe the flaw is on the 0–10 CVSS scale.
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:N

What to do

Upgrade diesel to 2.3.8.

Affected software

ProductAffectedFixed in
crates.iodieselAffected
  • <2.3.8
Fixed in
  • 2.3.8

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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.

References

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