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Diesel has possible use after free when deserializing a SQLite database via `SqliteConnection::deserialize_readonly_database` — diesel

Use After Free

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.

  • Published: Jul 16, 2026
  • Updated: Jul 17, 2026
  • GHSA: GHSA-ggxf-9f6j-w742
  • Severity: Medium
  • Exploit:
  • CISA KEV:

No technical information available.

CWEs:

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CVSS (Common Vulnerability Scoring System) estimates technical severity, but it doesn't automatically equal business risk. Prioritize using context like internet exposure, affected asset criticality, known exploitation (proof-of-concept or in-the-wild), and whether compensating controls exist. A "Medium" CVSS on an exposed, production system can be more urgent than a "Critical" on an isolated, non-production host.

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Use a simple, repeatable triage model: focus first on externally exposed assets, high-value systems (identity, VPN, email, production), vulnerabilities with known exploits, and issues that enable remote code execution or privilege escalation. Then enforce patch SLAs and track progress using consistent metrics so remediation is steady, not reactive.

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