GHSA-q8x8-jrhj-fh9p: Diesel Possible Unaligned Data Access For Vulnerability

MODERATE
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CWE-188
Published
Advisory Summary

GHSA-q8x8-jrhj-fh9p is a MODERATE possible unaligned data access for vulnerability (CWE-188: Reliance on Data/Memory Layout) affecting Diesel libraries in the crates.io ecosystem. The issue involves possible unaligned data access for implementations of `sqliteaggregate`. Remediation is available by upgrading affected packages to version 2.3.8.

GHSA-q8x8-jrhj-fh9p at a Glance

CVE Identifier N/A
GHSA Identifier GHSA-q8x8-jrhj-fh9p
Severity MODERATE
CVSS v3.1 Base Score N/A
CWE Classification CWE-188: Reliance on Data/Memory Layout
Affected Product Diesel
Package Ecosystem crates.io
Published Date
Last Updated

How to Fix GHSA-q8x8-jrhj-fh9p

To remediate this vulnerability, upgrade all affected Diesel dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

diesel fixed: 2.3.8 
Upgrade diesel to 2.3.8
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for diesel

How to Check if You Are Affected

To determine whether your application is affected by GHSA-q8x8-jrhj-fh9p, inspect your project dependencies for Diesel:

inspect dependencies for diesel

Analyze the terminal output to locate any version of Diesel in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 2.3.8), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-188: Reliance on Data/Memory Layout, where the product makes invalid assumptions about how protocol data or memory is organized at a lower level, resulting in unintended program behavior. In Diesel, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

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.

GHSA-q8x8-jrhj-fh9p Affected Diesel Versions

1 component(s)
Fixed Versions:
2.3.8
Product / Package Ecosystem Affected Versions Fixed Version
diesel
 crates.io
< 2.3.8
2.3.8

References

Diesel Source Repository REPOSITORY
https://github.com/diesel-rs/diesel/pull/5042
Diesel Source Repository REPOSITORY
https://github.com/diesel-rs/diesel
rustsec.org/advisories/rustsec-... WEB
https://rustsec.org/advisories/RUSTSEC-2026-0137.html

Frequently Asked Questions

What is GHSA-q8x8-jrhj-fh9p?
GHSA-q8x8-jrhj-fh9p is a security vulnerability in Diesel involving Possible unaligned data access for implementations of `SqliteAggregate` under CWE-188: Reliance on Data/Memory Layout.
Which Diesel versions are affected?
Affected versions include releases prior to 2.3.8 across affected packages: diesel.
What version fixes GHSA-q8x8-jrhj-fh9p?
Upgrading to 2.3.8 (or the latest patched release for your respective branch) resolves the vulnerability.
Is diesel affected?
Yes, diesel is affected in releases prior to 2.3.8. Upgrade your dependency to 2.3.8 or later.
What CWE is associated with GHSA-q8x8-jrhj-fh9p?
GHSA-q8x8-jrhj-fh9p is classified under CWE-188: Reliance on Data/Memory Layout (The product makes invalid assumptions about how protocol data or memory is organized at a lower level, resulting in unintended program behavior.).
How can I check crates.io dependencies for GHSA-q8x8-jrhj-fh9p?
Run the dependency tree command: 'inspect dependencies for diesel'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-q8x8-jrhj-fh9p",
  "modified" : "2026-05-19T19:39:38Z",
  "published" : "2026-05-19T19:39:37Z",
  "aliases" : [ ],
  "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.\n\nTo 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.\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.",
  "severity" : [ {
    "type" : "CVSS_V4",
    "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"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "crates.io",
      "name" : "diesel"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "2.3.8"
      } ]
    } ]
  } ],
  "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"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-188" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-05-19T19:39:37Z",
    "nvd_published_at" : null
  }
}