In lsquic before 4.9.0, the HTTP/3 implementation can use an excessive amount of memory because the number of buffered header sets is not limited, as demonstrated by a QPACK amplification attack. This is related to header_out_dynamic_entry …

{
                    "defaultStatus": "unaffected",
                    "product": "lsquic",
                    "vendor": "litespeedtech",
                    "versions": [
                        {
                            "lessThan": "4.9.0",
                            "status": "affected",
                            "version": "0",
                            "versionType": "semver"
                        }
                    ]
                }