The randompasswordgenerator (aka RandomPasswordGenerator) gem through 1.0.0 for Ruby uses Kernel#rand to generate passwords, which, due to its cyclic nature, can facilitate password prediction.
{
    "github_reviewed_at": "2022-05-25T20:15:34Z",
    "severity": "HIGH",
    "github_reviewed": true,
    "cwe_ids": [
        "CWE-330",
        "CWE-335"
    ],
    "nvd_published_at": "2022-05-18T11:15:00Z"
}