A memory-accounting bypass exists in the downstream DNS-over-QUIC (DoQ) implementation. When DoQ is enabled, the first two bidirectional streams on a new QUIC connection (stream id 0 and 4) bypass the per-stream `quic-size` gate. Large input buffers are allocated after the 2-byte length prefix is received from these initial streams, allowing a remote client to exceed the configured `quic-size` limit with minimal input. By sending a declared 65535-byte length prefix and keeping the streams open, a client can cause the system to allocate approximately double that amount, leading to a denial of service for new DoQ clients. This issue requires the software to be compiled with DoQ support using `--with-libngtcp2` and the `quic-port` to be configured for listening interfaces.