CVE-2026-55032 in Word
Summary
by MITRE • 07/14/2026
Use after free in Microsoft Office Word allows an unauthorized attacker to execute code locally.
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Analysis
by VulDB Data Team • 07/14/2026
This vulnerability represents a critical use-after-free flaw in Microsoft Office Word that enables remote code execution through maliciously crafted documents. The vulnerability occurs when the application fails to properly validate memory management during document processing operations, specifically when handling certain object references after they have been freed from memory. When an attacker crafts a malicious Word document containing specially constructed elements, the application may attempt to access memory locations that have already been deallocated, creating a scenario where arbitrary code can be executed with the privileges of the targeted user.
The technical implementation of this vulnerability stems from improper memory handling within Word's document parsing engine, which processes various document formats including .doc, .docx, and other Office file types. When processing malformed content, the application allocates memory for objects such as tables, images, or formatting elements, but fails to properly track their lifecycle. This allows an attacker to manipulate the document structure in a way that causes the application to reference freed memory locations, leading to memory corruption that can be exploited through carefully crafted code placement within the freed memory space.
From an operational perspective, this vulnerability presents significant risk as it enables attackers to execute arbitrary code on targeted systems with the same privileges as the user running Word. The attack typically requires social engineering to convince victims to open malicious documents, making it particularly dangerous in enterprise environments where users may inadvertently open compromised files. The exploit can potentially lead to full system compromise, data exfiltration, and persistence mechanisms being established through the execution of malicious payloads.
The vulnerability aligns with CWE-416 which defines use-after-free conditions as a common memory safety issue that occurs when a program continues to reference memory after it has been freed by the system. This flaw also maps to several ATT&CK techniques including initial access through malicious documents, execution via Word macro commands, and privilege escalation if the user has elevated permissions. The attack chain typically involves delivering the malicious document through email attachments, compromised websites, or removable media, with successful exploitation resulting in code execution on the target system.
Mitigation strategies should include keeping Microsoft Office updated with the latest security patches from Microsoft, implementing strict document validation policies, and educating users about the risks of opening untrusted documents. Organizations should also deploy application whitelisting solutions to restrict execution of unauthorized binaries and implement email filtering systems that can detect and block suspicious attachments. Additionally, enabling exploit protection features in Windows such as Data Execution Prevention and Address Space Layout Randomization can help reduce the effectiveness of exploitation attempts. The most effective long-term solution remains prompt application of Microsoft security updates and maintaining comprehensive patch management programs to address known vulnerabilities before they can be exploited by threat actors.