In Mozilla Bleach before 3.12, a mutation XSS in bleach.clean when RCDATA and either svg or math tags are whitelisted and the keyword argument strip=False.
{
"unresolved_ranges": [
{
"cpe": "cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*",
"source": "CPE_FIELD",
"extracted_events": [
{
"last_affected": "33"
}
]
}
]
}