Arti -- Security issues related to circuit construction

Tor Project reports:

		When building anonymizing circuits to or from an onion
		service with 'lite' vanguards (the default) enabled, the
		circuit manager code would build the circuits with one
		hop too few.
	

		When 'full' vanguards are enabled, some circuits are
		supposed to be built with an extra hop to minimize the
		linkability of the guard nodes. In some circumstances,
		the circuit manager would build circuits with one hop
		too few, making it easier for an adversary to discover
		the L2 and L3 guards of the affected clients and
		services.