An attacker can trigger an assertion failure by requesting crafted DNS records, waiting for them to be inserted into the records cache, then send a query with qtype set to ANY.
{
"versions": [
{
"introduced": "0"
},
{
"last_affected": "5.3.0-NA"
},
{
"introduced": "0"
},
{
"last_affected": "5.3.1"
}
]
}