CVE-2026-72975 in Office
Summary
by MITRE • 09/09/2026
Out-of-bounds read in Microsoft Office PowerPoint allows an unauthorized attacker to disclose information over a network.
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Analysis
by VulDB Data Team • 09/09/2026
The vulnerability identified as an out-of-bounds read within Microsoft Office PowerPoint represents a critical memory safety flaw that compromises the confidentiality of system data through remote exploitation vectors. This specific type of error occurs when the application attempts to access memory locations beyond the boundaries of allocated buffers, typically due to insufficient validation of input parameters or improper handling of malformed file structures. In the context of PowerPoint presentations, this often involves parsing complex slide elements, embedded objects, or multimedia content where the software fails to correctly calculate buffer sizes before reading data from external sources. When an attacker crafts a malicious presentation file containing specially constructed payloads with invalid offsets or corrupted metadata, they can trigger the application to read memory contents that were not intended for disclosure. This behavior aligns directly with Common Weakness Enumeration category CWE-125, which defines out-of-bounds read as accessing memory beyond the end of an allocated buffer, leading to the exposure of sensitive information stored in adjacent memory regions.
The operational impact of this vulnerability is primarily centered on unauthorized data disclosure rather than immediate code execution or system compromise. By exploiting the out-of-bounds read condition, a remote attacker can extract arbitrary amounts of data from the victim's process space, potentially including cryptographic keys, session tokens, passwords, or other sensitive information currently held in memory by the PowerPoint application. This capability allows for significant privacy violations and can serve as an initial foothold for more advanced attacks if combined with subsequent exploitation techniques such as heap spraying or information leakage to bypass security mitigations like Address Space Layout Randomization. The attack vector is classified under remote code execution principles, specifically leveraging social engineering tactics where the victim must open a malicious file, placing this vulnerability within the MITRE ATT&CK framework's category of Initial Access via Spearphishing Attachment. This highlights the importance of user awareness alongside technical controls in mitigating such risks.
Mitigation strategies for this vulnerability require a multi-layered approach involving both immediate patching and long-term architectural improvements. Organizations must ensure that all instances of Microsoft Office are updated to the latest security patches released by Microsoft, which address the specific memory handling flaws within PowerPoint's parsing engine. Additionally, implementing application control policies such as AppLocker or Windows Defender Application Control can restrict the execution of untrusted scripts and macros often associated with delivering these malicious payloads. Network segmentation should be employed to limit lateral movement in case a host is compromised, while endpoint detection and response solutions can monitor for anomalous memory access patterns indicative of exploitation attempts. From a development perspective, adopting secure coding practices that enforce strict bounds checking on all buffer operations and utilizing static analysis tools during the software lifecycle are essential steps to prevent similar vulnerabilities from being introduced into future versions of productivity suites.