libexpat in Expat before 2.7.2 allows attackers to trigger large dynamic memory allocations via a small document that is submitted for parsing.
Exploitability
AV:NAC:HPR:NUI:RScope
S:UImpact
C:HI:NA:NCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N