CVE-2026-91095 – In proxygen from v2024.10.28.00 until v2026.09.28.00, the HTTPTransaction::onWebTransportU

In proxygen from v2024.10.28.00 until v2026.09.28.00, the HTTPTransaction::onWebTransportUniStream and HTTPTransaction::onWebTransportBidiStream APIs could return stream handles that the stream handler had already freed. HQSession then installed those handles as transport read callbacks, which could lead to use of freed memory.