{
  "affected": [
    {
      "database_specific": {
        "categories": [
          "memory-corruption"
        ],
        "cvss": null,
        "informational": "unsound"
      },
      "ecosystem_specific": {
        "affected_functions": null,
        "affects": {
          "arch": [],
          "functions": [],
          "os": []
        }
      },
      "package": {
        "ecosystem": "crates.io",
        "name": "metacall",
        "purl": "pkg:cargo/metacall"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.0.0-0"
            }
          ],
          "type": "SEMVER"
        }
      ],
      "versions": []
    }
  ],
  "aliases": [],
  "database_specific": {
    "license": "CC0-1.0"
  },
  "details": "Two soundness violations exist in the Rust bindings for MetaCall:\n\n**Null-pointer dereference:** `MetaCallFuture::new_raw()` accepts a raw\npointer without validation. The `Debug` impl calls `Box::from_raw(self.data)`\non it. Passing a null pointer causes the `Debug` impl to construct a\n`NonNull` from null, producing undefined behavior.\n\n**Double-free:** `MetaCallPointer::clone()` shares the same `rust_value` raw\npointer between the clone and the original. Calling `get_value_untyped()` on\nboth clones calls `Box::from_raw` on the same pointer twice, resulting in a\ndouble-free.\n\nBoth issues can be triggered through safe public APIs \u2014\n`MetaCallFuture::new_raw()`, `MetaCallPointer::new()`, `clone()`, and\n`get_value_untyped()` \u2014 with no `unsafe` required from the caller.",
  "id": "RUSTSEC-2026-0139",
  "modified": "2026-05-13T14:54:08Z",
  "published": "2026-05-02T12:00:00Z",
  "references": [
    {
      "type": "PACKAGE",
      "url": "https://crates.io/crates/metacall"
    },
    {
      "type": "ADVISORY",
      "url": "https://rustsec.org/advisories/RUSTSEC-2026-0139.html"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/metacall/core/issues/618"
    }
  ],
  "related": [],
  "severity": [],
  "summary": "Null-pointer dereference and double-free via safe APIs"
}