CVE-2026-78430 in mcp-ffmpeg-helper
Summary
by MITRE • 08/24/2026
A vulnerability was detected in sworddut mcp-ffmpeg-helper 0.1.0/0.1.1/0.2.1. This affects the function handleToolCall of the file src/tools/handlers.ts of the component Tool Handler. The manipulation of the argument format results in os command injection. Attacking locally is a requirement. The exploit is now public and may be used. The project was informed of the problem early through an issue report but has not responded yet.
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Analysis
by VulDB Data Team • 08/24/2026
The vulnerability identified within sworddut mcp-ffmpeg-helper versions 0.1.0, 0.1.1, and 0.2.1 represents a critical security flaw rooted in improper input validation and sanitization mechanisms. Specifically, the defect resides in the handleToolCall function located within the src/tools/handlers.ts file of the Tool Handler component. This architectural placement is significant as it serves as the primary entry point for processing external tool requests within the application context. The core technical issue stems from how user-supplied arguments are parsed and subsequently passed to underlying system commands without adequate filtering or escaping. When an attacker provides a specially crafted argument format, they can inject arbitrary operating system commands that execute with the privileges of the running process. This type of flaw is classically categorized under CWE-78 Improper Neutralization of Special Elements used in an OS Command, commonly known as Operating System Command Injection. The vulnerability arises because the application fails to distinguish between legitimate command arguments and malicious shell metacharacters or injection payloads, allowing external control over system-level operations.
The operational impact of this vulnerability is severe due to its potential for remote code execution within the context of the host environment. Although the initial assessment indicates that local attack requirements are necessary, meaning an attacker must have some level of access to trigger the flaw, such as through a compromised user account or via another application on the same system, the consequences remain critical if exploited successfully. An adversary who leverages this command injection can execute arbitrary commands, potentially leading to data exfiltration, modification of sensitive files, installation of backdoors, or using the compromised host as a pivot point for further network attacks. The fact that an exploit is now public significantly lowers the barrier to entry for malicious actors, increasing the likelihood of automated scanning and exploitation attempts against systems running these specific versions. This situation aligns with ATT&CK technique T1059 Command and Scripting Interpreter, where adversaries use system utilities like sh or cmd to execute commands, and potentially T1203 Software Execution if it leads to deploying additional malicious software.
The response from the project maintainers has been notably slow, as they were informed early through an issue report but have not yet issued a patch or acknowledgment. This delay exacerbates the risk for users who continue to operate vulnerable instances without mitigation strategies in place. In the absence of an official update, immediate remediation requires defensive coding practices and environmental hardening. Developers should implement strict input validation that whitelists allowed characters rather than blacklisting dangerous ones, as blacklist approaches are often bypassed by novel injection techniques. Additionally, using parameterized APIs or safe libraries for executing system commands can prevent the shell from interpreting injected metacharacters. For existing deployments, network segmentation and least-privilege principles should be enforced to limit the impact of a successful exploitation event. Monitoring logs for unusual command execution patterns related to ffmpeg processes can also aid in early detection of attempted exploits while waiting for an official security patch.