libxml2 before 2.12.10 and 2.13.x before 2.13.6 has a use-after-free in xmlSchemaIDCFillNodeTables and xmlSchemaBubbleIDCNodeTables in xmlschemas.c. To exploit this, a crafted XML document must be validated against an XML schema with certain identity constraints, or a crafted XML schema must be used.
Exploitability
AV:LAC:HPR:NUI:NScope
S:CImpact
C:HI:HA:N7.8/CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:NMemory Safety