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CVE-2026-80302

Avast sandbox escape via arbitrary file write in virtualized environment

No exploitation reported by the sources we read.

  • Published2026-11-06
  • WeaknessCWE-434 · CWE-653

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2026-11-0616:00CVE publishedCNA

Versions per branch

Products declared by the CNA

As GEN, the CNA that assigned this CVE, declared them in the CVE record; versions as written. NVD lists no product for this CVE yet: this is the only product data so far.

  • Gen Digital Avast Antivirus, Avast One, Avast Premium Security, Avast Ultimateother versions: affected

    platforms: Windows

    Affected
    • < 26.7fixed in 26.7custom
  • Gen Digital AVG Antivirus Free, AVG Internet Security, AVG Ultimateother versions: affected

    platforms: Windows

    Affected
    • < 26.7fixed in 26.7custom
  • Gen Digital Norton Antivirus Plus, Norton 360 Standard, Norton 360 Deluxe, Norton 360 Advancedother versions: affected

    platforms: Windows

    Affected
    • < 26.7fixed in 26.7custom

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-11-06

Neither OSV.dev nor the vendor advisories we read list affected versions for CVE-2026-80302 yet.

Full record on NVD

Fix

No fix published by the sources we read yet. NVD record

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Published
2026-11-06
Last Modified
2026-11-10
NVD status
Received
GitHub Advisory
GHSA-xpw6-9p2c-cjrx

Frequently asked questions

What is CVE-2026-80302?

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.

Is CVE-2026-80302 actively exploited?

Active exploitation of CVE-2026-80302 has not been confirmed. Its EPSS score was 0.2% on 2026-11-09, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-80302?

CVE-2026-80302 has a CVSS v3 base score of 8.8 (HIGH severity), with vector string CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H.

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