WinRAR Critical Vulnerability # CVE-2025-31334

A newly disclosed vulnerability in WinRAR, the world’s most widely used file compression tool with over 500 million users, may allow attackers to sneak past Windows security warnings and execute malicious code without raising alarms. Tracked as CVE-2025-31334, this Mark-of-the-Web (MotW) bypass vulnerability impacts WinRAR versions prior to 7.11, and has been rated CVSS 6.8 due to its potential for abuse in real-world scenarios.
At the core of CVE-2025-31334 is how WinRAR processes symbolic links (symlinks)—pointers that redirect to files or directories. Attackers can craft .rar archives containing malicious symlinks that point to executable files, effectively tricking users into launching untrusted code without the usual Windows MotW prompt.
Normally, Windows flags downloaded files with a “Mark of the Web,” warning users before opening potentially dangerous content. However, this vulnerability lets attackers slip past that safeguard.
When a user extracts and opens the symlink from a vulnerable version of WinRAR, no warning dialog is displayed, even if the original file came from an untrusted source like the internet or an email attachment.
Imagine this scenario: you download a seemingly harmless archive file. Inside, nestled amongst other files, is a crafted symbolic link. Unbeknownst to you, this symlink points to a malicious executable file. When you attempt to access the linked file via WinRAR, the vulnerability allows the executable to run without the usual MOTW warning. This opens the door for attackers to:
Install malware: Viruses, ransomware, and spyware could be silently installed on your system.Steal sensitive data: Personal information, passwords, and financial data could be compromised.Gain remote access: Attackers could take control of your computer remotely.Cause system damage: Malicious code could corrupt or delete critical system files.The good news is that a fix is available! WinRAR version 7.11 addresses this vulnerability. If you’re using an older version, immediately update to the latest release. This is the most crucial step in protecting your system from potential attacks.