rustsec-2023-0087
Vulnerability from osv_rustsec
Published
2023-10-14 12:00
Modified
2025-10-28 06:02
Summary
`MaybeUninit` misuse in `simd-json-derive`
Details

An invalid use of MaybeUninit::uninit().assume_init() in simd-json-derive's derive macro can cause undefined behavior. The original code used MaybeUninit to avoid initialisation of the struct and then set the fields using ptr::write. The undefined behavior triggered by this misuse of MaybeUninit can lead to invlaid memory access and panics in binaries compiled in release mode (aka simd-json-derive prior to version 0.12 has UB and optimizes into some nonsense)

The 0.12.0 removes this section of code, avoiding the use of MaybeUninit alltogether.

To clipboard 

{
  "affected": [
    {
      "database_specific": {
        "categories": [],
        "cvss": null,
        "informational": "unsound"
      },
      "ecosystem_specific": {
        "affected_functions": null,
        "affects": {
          "arch": [],
          "functions": [],
          "os": []
        }
      },
      "package": {
        "ecosystem": "crates.io",
        "name": "simd-json-derive",
        "purl": "pkg:cargo/simd-json-derive"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.0.0-0"
            },
            {
              "fixed": "0.12.0"
            }
          ],
          "type": "SEMVER"
        }
      ],
      "versions": []
    }
  ],
  "aliases": [
    "GHSA-pqpw-89w5-82v5"
  ],
  "database_specific": {
    "license": "CC0-1.0"
  },
  "details": "An invalid use of `MaybeUninit::uninit().assume_init()` in `simd-json-derive`\u0027s derive macro can cause undefined behavior. The original code used `MaybeUninit` to avoid initialisation of the struct and then set the fields using `ptr::write`. The undefined behavior triggered by this misuse of `MaybeUninit` can lead to invlaid memory access and panics in binaries compiled in release mode (aka simd-json-derive prior to version 0.12 has UB and optimizes into some nonsense)\n\nThe `0.12.0` removes this section of code, avoiding the use of MaybeUninit alltogether.",
  "id": "RUSTSEC-2023-0087",
  "modified": "2025-10-28T06:02:18Z",
  "published": "2023-10-14T12:00:00Z",
  "references": [
    {
      "type": "PACKAGE",
      "url": "https://crates.io/crates/simd-json-derive"
    },
    {
      "type": "ADVISORY",
      "url": "https://rustsec.org/advisories/RUSTSEC-2023-0087.html"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/simd-lite/simd-json-derive/issues/67"
    }
  ],
  "related": [],
  "severity": [],
  "summary": "`MaybeUninit` misuse in `simd-json-derive`"
}


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