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CVE-2026-80302— Avast sandbox escape via arbitrary file write in virtualized environment

Quick assessment

Affected
Gen Digital Avast Antivirus, Avast One, Avast Premium Security, Avast Ultimate
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Windows 平台上 Avast 沙箱的文件虚拟化层存在隔离不足的问题，允许本地低权限攻击者在沙箱内部执行时，向沙箱隔离范围之外写入任意文件，并在主机上执行代码。 该沙箱通过拦截对受保护系统目录的写入请求来实现文件系统操作的虚拟化。然而，虚拟化实现在某些边缘情况下未能正确验证写入目标，导致写入操作绕过虚拟化重定向，直接访问受保护位置的实际主机文件系统。 攻击者可利用此漏洞，用任意内容覆盖可执行文件、系统库或启动配置文件，从而在后续系统操作或重启时，以主机权限执行恶意代码。

AI Predicted 8.8 Difficulty: Moderate
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I. Basic Information for CVE-2026-80302

Vulnerability Information
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Vulnerability Title
Avast sandbox escape via arbitrary file write in virtualized environment
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
危险类型文件的不加限制上传
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Gen Digital Avast Antivirus, Avast One, Avast Premium Security, Avast Ultimate 0 ~ 26.7 -
Gen Digital AVG Antivirus Free, AVG Internet Security, AVG Ultimate 0 ~ 26.7 -
Gen Digital Norton Antivirus Plus, Norton 360 Standard, Norton 360 Deluxe, Norton 360 Advanced 0 ~ 26.7 -

II. Public POCs for CVE-2026-80302

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III. Intelligence Information for CVE-2026-80302

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Vendor Pages for CVE-2026-80302 (3)

Same Patch Batch · Gen Digital · 2026-11-06 · 4 CVEs total

CVE-2026-12067 AvastSvc denial of service via unhandled JsonCpp exceptions in native message handlers
CVE-2026-80303 Avast WFP stream parser integer underflow causes system crash
CVE-2026-80301 Avast sandbox escape via unpreserved COM pathway through Task Scheduler

IV. Related Vulnerabilities

Same product: Avast Antivirus, Avast One, Avast Premium Security, Avast Ultimate
Same vendor: Gen Digital
Same weakness: CWE-434