CVE-2026-64625 in AVideo
Summary
by MITRE • 07/21/2026
AVideo before 29.0 contains an incomplete fix for CVE-2026-45578 where execAsync() re-wraps escaped commands in double-quoted sh -c, allowing command substitution via $() and backticks. Attackers can inject arbitrary OS commands through the Live plugin on_publish.php endpoint despite escapeshellarg() protection.
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Analysis
by VulDB Data Team • 07/21/2026
The vulnerability in Video before version 29.0 represents a critical command injection flaw that demonstrates poor understanding of shell escaping mechanisms and improper input validation. This issue stems from an incomplete remediation of CVE-2026-45578, where the developers attempted to address command injection vulnerabilities but failed to consider the full breadth of shell metacharacters that can bypass simple escaping mechanisms. The execAsync() function specifically re-wraps escaped commands within double-quoted shell contexts using sh -c, which creates a fundamental flaw in the security model since double quotes in bash do not prevent command substitution operations.
The technical implementation of this vulnerability allows attackers to exploit the Live plugin's on_publish.php endpoint through improper sanitization of user-supplied input. Despite the presence of escapeshellarg() protection, which is designed to properly escape shell arguments, the vulnerability exists because the system reprocesses these escaped values within a new shell context. This creates a scenario where command substitution syntax such as $() and backticks can be interpreted by the shell even after initial escaping, effectively nullifying the protective measures that were implemented.
The operational impact of this vulnerability extends beyond simple command injection to potentially enable complete system compromise through privilege escalation and lateral movement within network environments. Attackers can execute arbitrary operating system commands with the privileges of the web server process, which typically runs with elevated permissions in media processing environments. This vulnerability directly maps to CWE-78, known as "Improper Neutralization of Special Elements used in an OS Command," and aligns with ATT&CK technique T1059.007 for command and scripting interpreter. The attack surface is particularly concerning given that the vulnerable endpoint likely processes user-generated content, making it accessible through normal application usage patterns.
The root cause lies in the flawed assumption that escaping shell arguments once will be sufficient regardless of how those arguments are subsequently processed or re-wrapped. Modern secure coding practices dictate that input validation should occur at multiple layers and that re-processing of potentially dangerous data must be approached with extreme caution. The recommended mitigations include implementing proper input sanitization at the application level before any shell invocation, utilizing parameterized command execution where possible, and ensuring that all user-supplied data is properly validated against a strict whitelist of acceptable characters and patterns. Additionally, the system should avoid re-wrapping escaped arguments in new shell contexts and instead implement more robust sandboxing mechanisms for executing external commands. Organizations should also consider implementing web application firewalls and runtime monitoring to detect and prevent exploitation attempts.