CVE-2025-8088 in WinRAR
Summary
by MITRE • 08/08/2025
A path traversal vulnerability affecting the Windows version of WinRAR allows the attackers to execute arbitrary code by crafting malicious archive files. This vulnerability was exploited in the wild and was discovered by Anton Cherepanov, Peter Košinár, and Peter Strýček from ESET.
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Analysis
by VulDB Data Team • 02/03/2026
The vulnerability identified as CVE-2025-8088 represents a critical path traversal flaw in the Windows implementation of WinRAR archive software, exposing users to significant remote code execution risks. This vulnerability stems from improper input validation within the archive extraction process, specifically when handling file paths within compressed archives. Attackers can exploit this weakness by crafting specially designed archive files that contain malicious path traversal sequences, allowing them to write files to arbitrary locations on the target system. The flaw was particularly concerning because it enabled attackers to bypass normal file system access controls and execute arbitrary code with the privileges of the user running WinRAR. The vulnerability was actively exploited in the wild before its disclosure, indicating that threat actors had already developed working payloads targeting this specific weakness. The discovery was attributed to security researchers Anton Cherepanov, Peter Košinár, and Peter Strýček from ESET, who identified the flaw through careful analysis of the archive processing routines. This vulnerability falls under the Common Weakness Enumeration category CWE-22, which specifically addresses path traversal or directory traversal flaws in software implementations. The attack vector leverages the ATT&CK technique T1059.007 for command and script interpreter execution, where adversaries use the compromised archive extraction process to run malicious code directly on target systems. The impact extends beyond simple file system manipulation as the vulnerability allows attackers to install malware, modify system configurations, or establish persistent access points. The exploitation requires no special privileges beyond those normally required to execute WinRAR, making it particularly dangerous for end users who may unknowingly open malicious archives. The vulnerability demonstrates a fundamental flaw in how WinRAR handles file path resolution during extraction, where relative path components such as ../ or ..\ are not properly sanitized or rejected. This allows attackers to craft archive entries that, when extracted, will overwrite system files or create malicious files in critical system directories. The attack chain typically involves the delivery of a malicious archive through phishing emails, compromised websites, or other social engineering methods, followed by automatic extraction when the user opens the archive. The exploitation process can lead to privilege escalation if the user has administrative rights, or it can establish a foothold for further attacks. Organizations should note that this vulnerability affects not only individual users but also enterprise environments where WinRAR is commonly used for file distribution and collaboration. The patching process requires updating to the latest version of WinRAR where proper path validation has been implemented. Security teams should monitor for indicators of compromise related to this vulnerability and ensure that users are educated about the risks of opening untrusted archives. The vulnerability also highlights the importance of input sanitization in archive processing software, as similar flaws may exist in other archiving tools that handle file paths without proper validation. This type of vulnerability represents a classic example of how seemingly benign file processing operations can become attack vectors when proper security controls are not implemented. The technical nature of the flaw makes it particularly difficult to detect through traditional network monitoring, as the malicious behavior occurs locally on the victim machine during the archive extraction process rather than through network-based attacks. Organizations must consider the broader implications of such vulnerabilities in their software supply chains, as archive processing is a common function across many applications and systems. The remediation approach should include both immediate patching of affected WinRAR installations and ongoing security awareness training for users to recognize potentially malicious archive files. The vulnerability also underscores the need for regular security assessments of commonly used software tools, particularly those that handle file system operations with elevated privileges.