Reported

June 5, 2026

Issued

June 5, 2026

Package

diesel (crates.io)

Type

INFO Unsound

References

• https://github.com/diesel-rs/diesel/commit/1bc2ea46d9840e8d9af844239d3c84f37fe7d84b

Patched

• >=2.3.10

Affected Functions

Version

diesel::sqlite::SqliteConnection::deserialize_readonly_database

• <2.3.10

Description

Diesel allows loading a SQLite database from a byte buffer, represented as &[u8], at runtime via the SqliteConnection::deserialize_readonly_database function. In previous versions of Diesel, this buffer was passed directly to libsqlite3. Since libsqlite3 requires the buffer to remain alive for as long as the database connection is open and Diesel did not ensure this as part of its safe API, callers of SqliteConnection::deserialize_readonly_database could drop the buffer prematurely. This prematurely drop caused libsqlite3 to operate on freed memory.

This vulnerability affects users of SqliteConnection::deserialize_readonly_database who drop the buffer passed to the function before they drop the database connection.

Mitigation

The preferred mitigation to the outlined problem is to update to Diesel version 2.3.10 or newer, which includes a fix for the problem. Alternatively users need to take to keep the buffer alive until the connection is dropped.

Resolution

Diesel now stores a copy of the buffer inside of the SqliteConnection object itself to keep it alive as long as the underlying libsqlite3 connection exists.

Advisory available under CC0-1.0 license.