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    3 vulnerabilities found for Avast Antivirus, Avast One, Avast Premium Security, Avast Ultimate by Gen Digital

    CVE-2026-80301 (GCVE-0-2026-80301)

    Vulnerability from cvelistv5 – Published: 2026-11-06 16:01 – Updated: 2026-11-10 18:33
    VLAI
    Title
    Avast sandbox escape via unpreserved COM pathway through Task Scheduler
    Summary
    Improper isolation in the Avast sandbox on Windows allows a local, low-privileged attacker executing inside the sandbox to access COM interfaces to the Task Scheduler service, escape containment, and execute code with elevated privileges outside the sandbox. The sandbox virtualizes file system and registry access but does not adequately restrict COM interface access to Task Scheduler. A process inside the sandbox can instantiate COM objects bound to Task Scheduler functionality and invoke methods to schedule and execute tasks on the host system. The Task Scheduler COM pathway is not blocked by the sandbox policy, allowing arbitrary code execution in the host security context. This escape vector bypasses the sandbox's intended process and file isolation boundaries and can be chained with other host-level privilege escalation techniques.
    Severity
    8.8 (High)
    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
    SSVC
    Exploitation: none Automatable: no Technical Impact: total
    CISA Coordinator · CISA-ADP (v2.0.3)
    Decision recorded 2026-11-10 18:29 UTC
    CWE
    • CWE-280 - Improper Handling of Insufficient Permissions or Privileges
    • CWE-653 - Improper Isolation or Compartmentalization
    Assigner
    GEN CNA
    References
    Impacted products
    Credits
    Teng Zheng Wang by VulnGuard Labs
    Show details on NVD website
    To clipboard 

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    CVE-2026-80302 (GCVE-0-2026-80302)

    Vulnerability from cvelistv5 – Published: 2026-11-06 16:00 – Updated: 2026-11-10 18:32
    VLAI
    Title
    Avast sandbox escape via arbitrary file write in virtualized environment
    Summary
    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.
    Severity
    8.8 (High)
    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
    SSVC
    Exploitation: none Automatable: no Technical Impact: total
    CISA Coordinator · CISA-ADP (v2.0.3)
    Decision recorded 2026-11-10 18:30 UTC
    CWE
    • CWE-434 - Unrestricted Upload of File with Dangerous Type
    • CWE-653 - Improper Isolation or Compartmentalization
    Assigner
    GEN CNA
    References
    Impacted products
    Credits
    Teng Zheng Wang by VulnGuard Labs
    Show details on NVD website
    To clipboard 

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    CVE-2026-80303 (GCVE-0-2026-80303)

    Vulnerability from cvelistv5 – Published: 2026-11-06 15:59 – Updated: 2026-11-10 19:11
    VLAI
    Title
    Avast WFP stream parser integer underflow causes system crash
    Summary
    An integer underflow vulnerability in the Avast Windows Filtering Platform (WFP) stream parser on Windows allows denial of service by causing a system crash. The WFP callout driver processes network stream data and computes length values for packet fragment reassembly. The length calculation does not properly validate input stream sizes against expected boundaries. When processing specially crafted input, the length computation underflows, resulting in allocation or buffer access with an extremely large wrapped-around size value. The underflow can be triggered remotely via network traffic destined for the filtered port, or locally via crafted data provided to the filtering interface. The resulting memory allocation failure or out-of-bounds access causes a kernel panic and system crash.
    Severity
    6.2 (Medium)
    CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
    SSVC
    Exploitation: none Automatable: no Technical Impact: partial
    CISA Coordinator · CISA-ADP (v2.0.3)
    Decision recorded 2026-11-10 19:10 UTC
    CWE
    • CWE-191 - Integer Underflow (Wrap or Wraparound)
    • CWE-248 - Uncaught Exception
    Assigner
    GEN CNA
    References
    Impacted products
    Credits
    Teng Zheng Wang by VulnGuard Labs
    Show details on NVD website
    To clipboard 

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              "cweId": "CWE-191",
              "description": "CWE-191: Integer Underflow (Wrap or Wraparound)",
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              "type": "CWE"
            },
            {
              "cweId": "CWE-248",
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          "url": "https://www.gendigital.com/us/en/contact-us/security-advisories/"
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          "name": "Avast: how to update Avast Antivirus or Avast One",
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          "url": "https://support.avast.com/en-us/article/Update-Antivirus"
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          "name": "AVG: updating AVG AntiVirus",
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          "url": "https://support.avg.com/SupportArticleView?l=en\u0026urlname=Update-AVG-Antivirus"
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      "source": {
        "discovery": "EXTERNAL"
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      "title": "Avast WFP stream parser integer underflow causes system crash",
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    "cveId": "CVE-2026-80303",
    "datePublished": "2026-11-06T15:59:24.348Z",
    "dateReserved": "2026-08-26T08:11:54.260Z",
    "dateUpdated": "2026-11-10T19:11:30.041Z",
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