CVE-2026-83844 in Windows
Summary
by MITRE • 10/14/2026
Out-of-bounds read in Windows Paint allows an unauthorized attacker to execute code over a network.
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Analysis
by VulDB Data Team • 10/14/2026
The vulnerability identified as CVE-2024-38176 represents a critical security flaw within the Microsoft Paint application, specifically involving an out-of-bounds memory read operation. This defect is rooted in how the software processes certain image file formats or specific metadata structures embedded within them. When Windows Paint parses these files, it fails to adequately validate the boundaries of data buffers before attempting to access their contents. Consequently, if a specially crafted malicious file containing malformed headers or corrupted structural elements is opened by the application, the program attempts to read memory locations that lie outside the allocated buffer space. This improper boundary checking allows for the leakage of sensitive information from adjacent memory regions and can potentially lead to further exploitation scenarios depending on the specific state of the heap at the time of access.
From a technical perspective, this flaw aligns with CWE-125, which describes out-of-bounds read vulnerabilities where software reads data past the end or before the beginning of the intended buffer. In the context of Windows Paint, an attacker can craft a malicious image file that triggers this condition when loaded into the application interface. The vulnerability is particularly dangerous because it occurs during the parsing phase, meaning no user interaction beyond opening the file in the vulnerable version of Paint is required to trigger the initial memory access violation. While out-of-bounds reads are often associated with information disclosure, they can also serve as a precursor to more severe attacks such as arbitrary code execution if the leaked data reveals critical pointers or heap metadata that an attacker can leverage for further exploitation steps like heap spraying or control flow hijacking.
The operational impact of this vulnerability is significant due to its potential for remote code execution over a network, although it typically requires user interaction in the form of opening the malicious file within Paint. An unauthorized attacker could distribute such a crafted image through various vectors including email attachments, instant messaging platforms, or compromised websites that prompt users to download and open images using default system applications like Windows Paint. If successful, this exploitation allows the attacker to execute arbitrary code with the privileges of the current user. This can lead to full compromise of the affected system, enabling data theft, installation of malware, establishment of persistent backdoors, or lateral movement within a corporate network environment where such files might be shared among employees as part of routine workflows involving image editing or viewing.
To mitigate this risk, organizations must ensure that all systems running Windows Paint are updated with the latest security patches released by Microsoft. These updates address the underlying memory management issues in the application's parsing logic and enforce stricter validation checks on input data structures. Administrators should prioritize patching efforts for workstations where users frequently handle external image files or collaborate via file-sharing mechanisms. Additionally, implementing application control policies that restrict the execution of untrusted scripts or binaries can reduce the impact if an exploit is attempted. Users should also be educated to exercise caution when opening image files from unknown sources and to verify the integrity of downloaded content before viewing it in any system application. Regular monitoring for anomalous process behavior involving Paint.exe may help detect exploitation attempts early, although proactive patching remains the most effective defense against this class of vulnerabilities.