An infinite loop in SMLLexer in Pygments versions 1.5 to 2.7.3 may lead to denial of service when performing syntax highlighting of a Standard ML (SML) source file, as demonstrated by input that only contains the "exception" keyword.
{
    "nvd_published_at": "2021-03-23T17:15:00Z",
    "severity": "HIGH",
    "github_reviewed_at": "2021-04-12T20:58:03Z",
    "github_reviewed": true,
    "cwe_ids": [
        "CWE-835"
    ]
}