The mail gem before 2.5.5 for Ruby (aka A Really Ruby Mail Library) is vulnerable to SMTP command injection via CRLF sequences in a RCPT TO or MAIL FROM command, as demonstrated by CRLF sequences immediately before and after a DATA substring.
{
"nvd_published_at": null,
"severity": "MODERATE",
"github_reviewed": true,
"github_reviewed_at": "2020-06-16T21:51:27Z",
"cwe_ids": [
"CWE-93"
]
}