GHSA-Q8X8-JRHJ-FH9P

Vulnerability from github – Published: 2026-05-19 19:39 – Updated: 2026-05-19 19:39
VLAI
Summary
Diesel: Possible unaligned data access for implementations of `SqliteAggregate`
Details

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.

Severity
6.3 (Medium)
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N
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{
  "affected": [
    {
      "package": {
        "ecosystem": "crates.io",
        "name": "diesel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.3.8"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [],
  "database_specific": {
    "cwe_ids": [
      "CWE-188"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-05-19T19:39:37Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
  },
  "details": "Diesel allows to register custom aggregate SQL functions for SQLite via the `SqliteAggregate` interface.\n\nTo store an instance of the custom aggregate processor Diesel relied on the `sqlite3_aggregate_context` function provided by sqlite. This function doesn\u0027t 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.\n\n## Mitigation\n\nThe preferred mitigation to the outlined problem is to update to a Diesel version 2.3.8 or newer, which includes fixes for the problem.\n\n## Resolution\n\nDiesel now allocates the corresponding memory on Rust side to get a correctly aligned allocation.",
  "id": "GHSA-q8x8-jrhj-fh9p",
  "modified": "2026-05-19T19:39:38Z",
  "published": "2026-05-19T19:39:37Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/diesel-rs/diesel/pull/5042"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/diesel-rs/diesel"
    },
    {
      "type": "WEB",
      "url": "https://rustsec.org/advisories/RUSTSEC-2026-0137.html"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Diesel: Possible unaligned data access for implementations of `SqliteAggregate`"
}


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