CVE-2026-78669: net/http - track HTTP/2 outbound stream flow-control windows
as a delta against a shared connection-level initial window, so a
SETTINGS_INITIAL_WINDOW_SIZE change is O(1) instead of iterating over every
open stream, preventing CPU exhaustion by a peer sending many SETTINGS frames
CVE-2026-78667: net/http - limit the number of ranges parsed from a Range
header in FileServer, ServeContent and ServeFile to 200 (configurable via
GODEBUG=httpservecontentmaxranges), ignoring headers with too many ranges to
avoid excessive CPU consumption