{
  "affected": [
    {
      "package": {
        "ecosystem": "Packagist",
        "name": "pocketmine/pocketmine-mp"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.0.6"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": true,
    "github_reviewed_at": "2022-01-13T22:08:36Z",
    "nvd_published_at": null,
    "severity": "HIGH"
  },
  "details": "### Impact\nA remote attacker may crash a server by sending `PlayerActionPacket` with invalid facing values (e.g. negative), specifically with `START_BREAK` or `CRACK_BLOCK` actions, or with a `UseItemTransactionData` (typically in `InventoryTransactionPacket`).\n\n### Patches\nf126479c37ff00a717a828f5271cf8e821d12d6c\n\n### Workarounds\nUsing a plugin, cancel `DataPacketReceiveEvent` if the packet is `PlayerActionPacket` and the facing is outside the range 0-5 when receiving START_BREAK or CRACK_BLOCK actions, or UseItemTransactionData. However, beware that negative values may be legitimate in some cases.\n\n### For more information\nIf you have any questions or comments about this advisory:\n* Email us at [team@pmmp.io](mailto:team@pmmp.io)",
  "id": "GHSA-xh99-hw7h-wf63",
  "modified": "2025-12-26T17:30:07Z",
  "published": "2022-01-13T22:25:44Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/pmmp/PocketMine-MP/security/advisories/GHSA-xh99-hw7h-wf63"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pmmp/PocketMine-MP/commit/f126479c37ff00a717a828f5271cf8e821d12d6c"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/pmmp/PocketMine-MP"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Unchecked validity of Facing values in PlayerActionPacket"
}