CVE-2025-65834 identifies a buffer overflow vulnerability in Meltytech Shotcut version 25.10.31, a popular open-source video editing software. The vulnerability arises when the application processes MLT project files containing manipulated width and height parameters set to extremely large values. These parameters cause the software to attempt to allocate an excessive amount of memory during image processing, specifically within the mlt_image_fill_white function. This memory allocation leads to a buffer overflow condition, resulting in a memory access violation. Buffer overflows can cause the application to crash or, in more severe cases, allow an attacker to execute arbitrary code by overwriting critical memory regions. Although no known exploits have been reported in the wild, the vulnerability poses a significant risk due to the nature of the flaw and the potential for remote exploitation if malicious project files are opened. The lack of a CVSS score and absence of patches suggest this is a newly disclosed issue requiring immediate attention from users and administrators. The vulnerability does not require authentication but does require user interaction to open a crafted MLT project file, which could be delivered via phishing or compromised file sharing. The vulnerability's root cause is improper input validation and unchecked memory allocation based on user-controlled parameters.

For European organizations, especially those involved in media production, broadcasting, or digital content creation using Shotcut, this vulnerability could lead to denial of service through application crashes or potentially allow attackers to execute arbitrary code on affected systems. This could compromise the confidentiality, integrity, and availability of systems handling sensitive media projects. Exploitation could facilitate lateral movement within networks or data exfiltration if attackers gain code execution capabilities. The impact is heightened in environments where Shotcut is integrated into automated workflows or used on shared workstations. Additionally, the absence of patches increases the window of exposure, necessitating heightened vigilance. Disruption of media production workflows could have economic and reputational consequences for European companies reliant on timely content delivery.

To mitigate this vulnerability, organizations should immediately restrict the opening of MLT project files from untrusted or unknown sources to prevent triggering the buffer overflow. Implement strict file validation and sandboxing measures for video editing applications to limit the impact of potential exploitation. Monitor vendor communications closely for security patches or updates addressing this issue and apply them promptly once available. Employ endpoint protection solutions capable of detecting anomalous application behavior or memory corruption attempts. Educate users about the risks of opening unsolicited project files and enforce policies for secure file sharing. Consider isolating video editing environments from critical network segments to reduce lateral movement risk. If feasible, temporarily substitute Shotcut with alternative video editing tools until a fix is released. Regularly back up important project files to mitigate data loss from crashes or exploitation.