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Heap-based buffer overflow in Microsoft Data Access Components (MDAC) 2.8 SP1 and SP2 and Windows Data Access Components (WDAC) 6.0 allows remote attackers to execute arbitrary code via crafted XML data that triggers access to an uninitialized object in memory, aka "ADO Cachesize Heap Overflow RCE Vulnerability."
Use CWE-119, Microsoft vendor hub and Data Access Components product page to widen CVE-2012-1891 into its surrounding weakness, vendor, and product context.
Compare it with CVE-2003-0903, CVE-2002-1918 and CVE-1999-1011 for nearby disclosures in the same product family. Additional editorial context is available in Weekly Security Roundup: Navigating the April 2026 Threat Landscape and Critical Framework Exploits.