CVE-2026-32221
Published: 14 April 2026
Summary
CVE-2026-32221 is a high-severity Heap-based Buffer Overflow (CWE-122) vulnerability in Microsoft Windows 11 24H2. Its CVSS base score is 8.4 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploitation for Privilege Escalation (T1068); ranked at the 20.7th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.
The strongest mitigations our analysis identified are NIST 800-53 SI-16 (Memory Protection) and SI-2 (Flaw Remediation).
Deeper analysis
CVE-2026-32221 is a heap-based buffer overflow vulnerability (CWE-122) in the Microsoft Graphics Component. This flaw allows an unauthorized attacker to execute code locally and carries a CVSS v3.1 base score of 8.4 (AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H), indicating high severity due to its potential for significant impact on confidentiality, integrity, and availability with low complexity and no privileges required.
A local attacker can exploit this vulnerability without user interaction by triggering the buffer overflow in the Microsoft Graphics Component. Successful exploitation enables arbitrary code execution in the context of the affected component, potentially leading to full system compromise given the high impact ratings across all security principles.
The official Microsoft Security Response Center advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-32221 provides details on patches and mitigation guidance for this vulnerability, published on 2026-04-14.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-22609
Vulnerability details
Heap-based buffer overflow in Microsoft Graphics Component allows an unauthorized attacker to execute code locally.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Heap buffer overflow in local Microsoft Graphics Component enables arbitrary code execution with no privileges or user interaction required (AV:L/PR:N/UI:N), directly mapping to exploitation for privilege escalation and potential full system compromise.
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Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Directly requires identification, reporting, prioritization, and timely remediation of the heap-based buffer overflow vulnerability in the Microsoft Graphics Component via patching.
Implements memory protections such as DEP, ASLR, and stack canaries to prevent exploitation of the heap-based buffer overflow for arbitrary code execution.
Validates and sanitizes inputs processed by the Microsoft Graphics Component to mitigate buffer overflows triggered by malformed graphics data.