Executive Summary
A high-severity integer overflow vulnerability has been identified in WinFsp, a software package. This vulnerability, tracked as CVE-2026-7162, has a CVSS score of 7.8 and could allow an attacker to achieve system-level access to the affected software if exploited. The affected versions include WinFsp 2.2.26112 and lower.
Technical Analysis
The vulnerability is classified as an integer overflow (CWE-190). The attack vector is local, meaning an attacker needs to have local access to the system to exploit this vulnerability. The vulnerability has a high attack complexity and requires low privileges. The root cause of this vulnerability is likely due to missing input validation or improper handling of integer values.
How It Gets Exploited
An attacker with local access to the system and low privileges could potentially exploit this vulnerability. The exploitation would involve providing a specially crafted input that triggers the integer overflow. When the vulnerable code processes this input, it fails to properly handle the integer value, leading to an overflow. This overflow could allow the attacker to execute arbitrary code, potentially achieving system-level access to the affected software.
Impact Assessment
The vulnerability affects WinFsp version 2.2.26112 and lower. Successful exploitation could allow an attacker to achieve system-level access, potentially leading to high impacts on confidentiality, integrity, and availability. The CVSS score of 7.8 indicates a high severity level.
Recommended Actions
To mitigate this vulnerability, it is recommended to update WinFsp to version 2.2B2 or later. Additionally, users should ensure that only authorized personnel have local access to the system and that proper access controls are in place.
Sources
- National Vulnerability Database (NVD)
- https://nvd.nist.gov/vuln/detail/CVE-2026-7162
- https://github.com/winfsp/winfsp/releases/tag/v2.2B2
- https://www.csa.gov.sg/alerts-and-advisories/alerts/al-2026-086