CVE-2026-42549: Flight has path traversal in `make Controller` CLI That Creates Arbitrary Vulnerability

{
  "schema_version" : "1.4.0",
  "id" : "GHSA-3xjv-pmf2-gf2q",
  "modified" : "2026-05-14T20:39:56Z",
  "published" : "2026-05-06T21:34:39Z",
  "aliases" : [ "CVE-2026-42549" ],
  "summary" : "Flight has path traversal in `make:controller` CLI that creates arbitrary directories outside project root",
  "details" : "### Summary\nThe `make:controller` CLI command calls `mkdir(..., recursive: true)` on a path built from the user-supplied controller name, **before** Nette's class-name validation runs. The class-file write is correctly rejected by Nette when the name contains `/`, but the recursive directory creation side effect is already committed — including directories located outside the project root through `../` traversal.\n\n### Affected code\n`flight/commands/ControllerCommand.php` (≈ 63-66):\n\n```php\nif (is_dir(dirname($controllerPath)) === false) {\n    $io->info('Creating directory ' . dirname($controllerPath), true);\n    mkdir(dirname($controllerPath), 0755, true);   // un-normalized, runs before validation\n}\n```\n\n### Proof of concept\n```\n$ php vendor/flightphp/runway/runway make:controller '../../../../tmp/CONTROLLER_TRAVERSAL_TEST/pwn'\nCreating directory .../app/controllers/../../../../tmp/CONTROLLER_TRAVERSAL_TEST\nNette\\InvalidArgumentException: Value '../../../../tmp/CONTROLLER_TRAVERSAL_TEST/pwnController' is not valid class name.\n\n$ ls /home/user/tmp/CONTROLLER_TRAVERSAL_TEST\n(directory exists — created before the exception was thrown)\n```\n\n### Impact\n- **Arbitrary directory creation outside the project root**, executable by any local actor that can run the Flight CLI (developer machine, shared CI build agent, compromised dev container).\n- Primes log-file planting for chained LFI exploitation (e.g. creating a directory where an attacker can later drop a `.php` file to be included via a distinct template-include weakness).\n- On Windows, the `\\` separator opens additional traversal surface.\n\n### Patch (fixed in `3.18.1`, commit `b8dd23a`)\nThe controller name is now normalized with `basename()` and validated against `^[A-Za-z_][A-Za-z0-9_]*$` before any `mkdir` side effect runs.\n\n### Credit\nDiscovered by **@Rootingg**.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "flightphp/core"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "3.18.1"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/flightphp/core/security/advisories/GHSA-3xjv-pmf2-gf2q"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-42549"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/flightphp/core"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-22" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-05-06T21:34:39Z",
    "nvd_published_at" : "2026-05-13T20:16:21Z"
  }
}