CVE-2026-80302
Received
Received - Intake
Sandbox Escape via File Virtualization Bypass in Avast
Vulnerability report for CVE-2026-80302, including description, CVSS score, EPSS score, affected products, exploitability, helpful resources, and attack-flow context.
Publication date: 2026-11-06
Last updated on: 2026-11-06
Assigner: NortonLifeLock Inc.
Description
Description
Insufficient isolation in the Avast sandbox file virtualization layer on Windows allows a local, low-privileged attacker executing inside the sandbox to write arbitrary files outside sandbox containment and execute code on the host.
The sandbox virtualizes file system operations by intercepting write requests to protected system directories. However, the virtualization implementation fails to properly validate write targets in certain edge cases, allowing writes to bypass the virtualization redirection and reach the actual host file system in protected locations.
An attacker can exploit this to overwrite executable files, system libraries, or startup configurations with arbitrary content, leading to code execution with host privileges on subsequent system operations or reboot.
CVSS Scores
EPSS Scores
| Probability: | |
| Percentile: |
Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| Gen Digital | Avast Antivirus, Avast One, Avast Premium Security, Avast Ultimate | From 0 (inc) to 26.7 (exc) |
| Gen Digital | AVG Antivirus Free, AVG Internet Security, AVG Ultimate | From 0 (inc) to 26.7 (exc) |
| Gen Digital | Norton Antivirus Plus, Norton 360 Standard, Norton 360 Deluxe, Norton 360 Advanced | From 0 (inc) to 26.7 (exc) |
Helpful Resources
Exploitability
CWE
KEV
| CWE ID | Description |
|---|---|
| CWE-653 | The product does not properly compartmentalize or isolate functionality, processes, or resources that require different privilege levels, rights, or permissions. |
| CWE-434 | The product allows the upload or transfer of dangerous file types that are automatically processed within its environment. |
