{
  "affected": [
    {
      "database_specific": {
        "categories": [
          "memory-corruption"
        ],
        "cvss": null,
        "informational": null
      },
      "ecosystem_specific": {
        "affected_functions": null,
        "affects": {
          "arch": [],
          "functions": [],
          "os": []
        }
      },
      "package": {
        "ecosystem": "crates.io",
        "name": "pyo3",
        "purl": "pkg:cargo/pyo3"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.28.0"
            },
            {
              "fixed": "0.28.2"
            }
          ],
          "type": "SEMVER"
        }
      ],
      "versions": []
    }
  ],
  "aliases": [],
  "database_specific": {
    "license": "CC0-1.0"
  },
  "details": "PyO3 0.28.1 added support for `#[pyclass(extends=PyList)] struct NativeSub` (and other native types) when targeting Python 3.12 and up with the `abi3` feature.\n\nIt was discovered that subclasses of such classes would use the type of the subclass when attempting to access to data of `NativeSub` contained within Python objects, amounting to memory corruption.\n\nPyO3 0.28.2 fixed the issue by using the type of (e.g.) `NativeSub` correctly.",
  "id": "RUSTSEC-2026-0013",
  "modified": "2026-02-18T12:13:46Z",
  "published": "2026-02-18T12:00:00Z",
  "references": [
    {
      "type": "PACKAGE",
      "url": "https://crates.io/crates/pyo3"
    },
    {
      "type": "ADVISORY",
      "url": "https://rustsec.org/advisories/RUSTSEC-2026-0013.html"
    },
    {
      "type": "WEB",
      "url": "https://github.com/PyO3/pyo3/pull/5807#issuecomment-3913251784"
    }
  ],
  "related": [],
  "severity": [],
  "summary": "Type confusion when accessing data from sublasses of subclasses of native types with `abi3` feature targeting Python 3.12 and up"
}