rustsec-2022-0094
Vulnerability from osv_rustsec
Published
2022-11-23 12:00
Modified
2025-10-28 06:02
Summary
Mimalloc Can Allocate Memory with Bad Alignment
Details

This crate depended on a promise regarding alignments made by the author of the mimalloc allocator to avoid using aligned allocation functions where possible for performance reasons. Since then, the mimalloc allocator's logic changed, making it break this promise. This caused this crate to return memory with an incorrect alignment for some allocations, particularly those with large alignments. The flaw was fixed by always using the aligned allocation functions.

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{
  "affected": [
    {
      "database_specific": {
        "categories": [],
        "cvss": null,
        "informational": "unsound"
      },
      "ecosystem_specific": {
        "affected_functions": null,
        "affects": {
          "arch": [],
          "functions": [],
          "os": []
        }
      },
      "package": {
        "ecosystem": "crates.io",
        "name": "mimalloc",
        "purl": "pkg:cargo/mimalloc"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.0.0-0"
            },
            {
              "fixed": "0.1.39"
            }
          ],
          "type": "SEMVER"
        }
      ],
      "versions": []
    }
  ],
  "aliases": [
    "GHSA-g23h-7vf9-xc25"
  ],
  "database_specific": {
    "license": "CC0-1.0"
  },
  "details": "This crate depended on a promise regarding alignments made by the author of the mimalloc allocator to avoid using aligned allocation functions where possible for performance reasons.\nSince then, the mimalloc allocator\u0027s logic changed, making it break this promise.\nThis caused this crate to return memory with an incorrect alignment for some allocations, particularly those with large alignments.\nThe flaw was fixed by always using the aligned allocation functions.",
  "id": "RUSTSEC-2022-0094",
  "modified": "2025-10-28T06:02:18Z",
  "published": "2022-11-23T12:00:00Z",
  "references": [
    {
      "type": "PACKAGE",
      "url": "https://crates.io/crates/mimalloc"
    },
    {
      "type": "ADVISORY",
      "url": "https://rustsec.org/advisories/RUSTSEC-2022-0094.html"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/purpleprotocol/mimalloc_rust/issues/87"
    }
  ],
  "related": [],
  "severity": [],
  "summary": "Mimalloc Can Allocate Memory with Bad Alignment"
}


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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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