rustsec-2025-0132
Vulnerability from osv_rustsec
Published
2025-11-28 12:00
Modified
2025-12-02 06:03
Summary
`Reader::open_mmap` unsoundly marks unsafe memmap operation as safe
Details

maxminddb prior to version 0.27 declared Reader::open_mmap as safe despite wrapping an inherently unsafe memmap2 operation with no extra step done to guarantee safety. This could have led to undefined behaviour if the file were to be modified on disk while the memory map was still active.

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{
  "affected": [
    {
      "database_specific": {
        "categories": [
          "memory-corruption"
        ],
        "cvss": null,
        "informational": null
      },
      "ecosystem_specific": {
        "affected_functions": null,
        "affects": {
          "arch": [],
          "functions": [
            "maxminddb::Reader::open",
            "maxminddb::Reader::open_mmap"
          ],
          "os": []
        }
      },
      "package": {
        "ecosystem": "crates.io",
        "name": "maxminddb",
        "purl": "pkg:cargo/maxminddb"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.11.0"
            },
            {
              "fixed": "0.27.0"
            }
          ],
          "type": "SEMVER"
        }
      ],
      "versions": []
    }
  ],
  "aliases": [
    "GHSA-mj73-j457-8x9q"
  ],
  "database_specific": {
    "license": "CC0-1.0"
  },
  "details": "maxminddb prior to version 0.27 declared `Reader::open_mmap` as safe \ndespite wrapping an inherently unsafe memmap2 operation with no\nextra step done to guarantee safety. This could have led to undefined\nbehaviour if the file were to be modified on disk while the memory map\nwas still active.",
  "id": "RUSTSEC-2025-0132",
  "modified": "2025-12-02T06:03:09Z",
  "published": "2025-11-28T12:00:00Z",
  "references": [
    {
      "type": "PACKAGE",
      "url": "https://crates.io/crates/maxminddb"
    },
    {
      "type": "ADVISORY",
      "url": "https://rustsec.org/advisories/RUSTSEC-2025-0132.html"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/oschwald/maxminddb-rust/issues/86"
    },
    {
      "type": "WEB",
      "url": "https://github.com/oschwald/maxminddb-rust/commit/98f0e4fff9678c841ed33f3b8a46322f6163c32a"
    }
  ],
  "related": [],
  "severity": [],
  "summary": "`Reader::open_mmap` unsoundly marks unsafe memmap operation as safe"
}


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