In libexpat in Expat before 2.2.7, XML input including XML names that contain a large number of colons could make the XML parser consume a high amount of RAM and CPU resources while processing (enough to be usable for denial-of-service attacks).
Reference Links(if available):
CVSS Score (if available)
v2: / HIGHAV:N/AC:L/Au:N/C:N/I:N/A:C
v3: / HIGHCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H