In RDoc 3.11 through 6.x before 6.3.1, as distributed with Ruby through 3.0.1, it is possible to execute arbitrary code via | and tags in a filename.
{
"nvd_published_at": "2021-07-30T14:15:00Z",
"github_reviewed": true,
"github_reviewed_at": "2021-08-02T18:08:41Z",
"severity": "HIGH",
"cwe_ids": [
"CWE-74",
"CWE-77",
"CWE-78"
]
}