Incorrect boundary conditions in the Audio/Video: Playback component. This vulnerability was fixed in Firefox 150, Thunderbird 150, Firefox ESR 140.10.1, Thunderbird 140.10.1, and Firefox ESR 115.35.2.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - Incorrect boundary conditions in the Audio/Video: Playback component. This vulnerability was fixed in     Firefox 150, Thunderbird 150, Firefox ESR 140.10.1, Thunderbird 140.10.1, and Firefox ESR 115.35.2.
    (CVE-2026-8091)

Note that Nessus relies on the presence of the package as reported by the vendor.

The version of Firefox ESR installed on the remote Windows host is prior to 115.35.2. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2026-42 advisory.

  - Memory safety bugs present in Firefox ESR 115.35.1, Firefox ESR 140.10.1 and Firefox 150.0.1. Some of     these bugs showed evidence of memory corruption and we presume that with enough effort some of these could     have been exploited to run arbitrary code. (CVE-2026-8092)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of Firefox ESR installed on the remote macOS or Mac OS X host is prior to 115.35.2. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2026-42 advisory.

  - Memory safety bugs present in Firefox ESR 115.35.1, Firefox ESR 140.10.1 and Firefox 150.0.1. Some of     these bugs showed evidence of memory corruption and we presume that with enough effort some of these could     have been exploited to run arbitrary code. (CVE-2026-8092)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of Thunderbird installed on the remote macOS or Mac OS X host is prior to 140.10.1. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2026-39 advisory.

  - Sandbox escape due to incorrect boundary conditions in the WebRTC: Networking component. This     vulnerability was fixed in Firefox 150, Thunderbird 150, Firefox ESR 140.10.1, and Thunderbird 140.10.1.
    (CVE-2026-7321)

  - Information disclosure due to incorrect boundary conditions in the Audio/Video component. This     vulnerability was fixed in Firefox 150.0.1, Firefox ESR 140.10.1, Firefox ESR 115.35.1, Thunderbird     150.0.1, and Thunderbird 140.10.1. (CVE-2026-7320)

  - Incorrect boundary conditions in the Audio/Video: Playback component. This vulnerability was fixed in     Firefox 150, Thunderbird 150, Firefox ESR 140.10.1, Thunderbird 140.10.1, and Firefox ESR 115.35.2.
    (CVE-2026-8091)

  - Memory safety bugs present in Thunderbird ESR 140.10.0 and Thunderbird 150.0.0. Some of these bugs showed     evidence of memory corruption and we presume that with enough effort some of these could have been     exploited to run arbitrary code. (CVE-2026-7322, CVE-2026-7323)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of Thunderbird installed on the remote Windows host is prior to 140.10.1. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2026-39 advisory.

  - Sandbox escape due to incorrect boundary conditions in the WebRTC: Networking component. This     vulnerability was fixed in Firefox 150, Thunderbird 150, Firefox ESR 140.10.1, and Thunderbird 140.10.1.
    (CVE-2026-7321)

  - Information disclosure due to incorrect boundary conditions in the Audio/Video component. This     vulnerability was fixed in Firefox 150.0.1, Firefox ESR 140.10.1, Firefox ESR 115.35.1, Thunderbird     150.0.1, and Thunderbird 140.10.1. (CVE-2026-7320)

  - Incorrect boundary conditions in the Audio/Video: Playback component. This vulnerability was fixed in     Firefox 150, Thunderbird 150, Firefox ESR 140.10.1, Thunderbird 140.10.1, and Firefox ESR 115.35.2.
    (CVE-2026-8091)

  - Memory safety bugs present in Thunderbird ESR 140.10.0 and Thunderbird 150.0.0. Some of these bugs showed     evidence of memory corruption and we presume that with enough effort some of these could have been     exploited to run arbitrary code. (CVE-2026-7322, CVE-2026-7323)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of Firefox ESR installed on the remote Windows host is prior to 140.10.1. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2026-36 advisory.

  - Sandbox escape due to incorrect boundary conditions in the WebRTC: Networking component. This     vulnerability was fixed in Firefox 150, Thunderbird 150, Firefox ESR 140.10.1, and Thunderbird 140.10.1.
    (CVE-2026-7321)

  - Information disclosure due to incorrect boundary conditions in the Audio/Video component. This     vulnerability was fixed in Firefox 150.0.1, Firefox ESR 140.10.1, Firefox ESR 115.35.1, Thunderbird     150.0.1, and Thunderbird 140.10.1. (CVE-2026-7320)

  - Incorrect boundary conditions in the Audio/Video: Playback component. This vulnerability was fixed in     Firefox 150, Thunderbird 150, Firefox ESR 140.10.1, Thunderbird 140.10.1, and Firefox ESR 115.35.2.
    (CVE-2026-8091)

  - Memory safety bugs present in Firefox ESR 115.35.0, Firefox ESR 140.10.0 and Firefox 150.0.0. Some of     these bugs showed evidence of memory corruption and we presume that with enough effort some of these could     have been exploited to run arbitrary code. (CVE-2026-7322)

  - Memory safety bugs present in Firefox ESR 140.10.0 and Firefox 150.0.0. Some of these bugs showed evidence     of memory corruption and we presume that with enough effort some of these could have been exploited to run     arbitrary code. (CVE-2026-7323)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of Firefox ESR installed on the remote macOS or Mac OS X host is prior to 140.10.1. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2026-36 advisory.

  - Sandbox escape due to incorrect boundary conditions in the WebRTC: Networking component. This     vulnerability was fixed in Firefox 150, Thunderbird 150, Firefox ESR 140.10.1, and Thunderbird 140.10.1.
    (CVE-2026-7321)

  - Information disclosure due to incorrect boundary conditions in the Audio/Video component. This     vulnerability was fixed in Firefox 150.0.1, Firefox ESR 140.10.1, Firefox ESR 115.35.1, Thunderbird     150.0.1, and Thunderbird 140.10.1. (CVE-2026-7320)

  - Incorrect boundary conditions in the Audio/Video: Playback component. This vulnerability was fixed in     Firefox 150, Thunderbird 150, Firefox ESR 140.10.1, Thunderbird 140.10.1, and Firefox ESR 115.35.2.
    (CVE-2026-8091)

  - Memory safety bugs present in Firefox ESR 115.35.0, Firefox ESR 140.10.0 and Firefox 150.0.0. Some of     these bugs showed evidence of memory corruption and we presume that with enough effort some of these could     have been exploited to run arbitrary code. (CVE-2026-7322)

  - Memory safety bugs present in Firefox ESR 140.10.0 and Firefox 150.0.0. Some of these bugs showed evidence     of memory corruption and we presume that with enough effort some of these could have been exploited to run     arbitrary code. (CVE-2026-7323)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of Thunderbird installed on the remote Windows host is prior to 150.0. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2026-33 advisory.

  - Incorrect boundary conditions, integer overflow in the Audio/Video: Playback component. This vulnerability     was fixed in Firefox 150 and Thunderbird 150. (CVE-2026-6783)

  - Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 150, Firefox ESR     115.35, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10. (CVE-2026-6746)

  - Use-after-free in the WebRTC component. This vulnerability was fixed in Firefox 150, Firefox ESR 140.10,     Thunderbird 150, and Thunderbird 140.10. (CVE-2026-6747)

  - Uninitialized memory in the Audio/Video: Web Codecs component. This vulnerability was fixed in Firefox     150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10. (CVE-2026-6748, CVE-2026-6751)

  - Information disclosure due to uninitialized memory in the Graphics: Canvas2D component. This vulnerability     was fixed in Firefox 150, Firefox ESR 115.35, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.
    (CVE-2026-6749)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of Thunderbird installed on the remote macOS or Mac OS X host is prior to 150.0. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2026-33 advisory.

  - Incorrect boundary conditions, integer overflow in the Audio/Video: Playback component. This vulnerability     was fixed in Firefox 150 and Thunderbird 150. (CVE-2026-6783)

  - Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 150, Firefox ESR     115.35, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10. (CVE-2026-6746)

  - Use-after-free in the WebRTC component. This vulnerability was fixed in Firefox 150, Firefox ESR 140.10,     Thunderbird 150, and Thunderbird 140.10. (CVE-2026-6747)

  - Uninitialized memory in the Audio/Video: Web Codecs component. This vulnerability was fixed in Firefox     150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10. (CVE-2026-6748, CVE-2026-6751)

  - Information disclosure due to uninitialized memory in the Graphics: Canvas2D component. This vulnerability     was fixed in Firefox 150, Firefox ESR 115.35, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.
    (CVE-2026-6749)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of Firefox installed on the remote Windows host is prior to 150.0. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2026-30 advisory.

  - Incorrect boundary conditions, integer overflow in the Audio/Video: Playback component. This vulnerability     was fixed in Firefox 150 and Thunderbird 150. (CVE-2026-6783)

  - Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 150, Firefox ESR     115.35, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10. (CVE-2026-6746)

  - Use-after-free in the WebRTC component. This vulnerability was fixed in Firefox 150, Firefox ESR 140.10,     Thunderbird 150, and Thunderbird 140.10. (CVE-2026-6747)

  - Uninitialized memory in the Audio/Video: Web Codecs component. This vulnerability was fixed in Firefox     150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10. (CVE-2026-6748, CVE-2026-6751)

  - Information disclosure due to uninitialized memory in the Graphics: Canvas2D component. This vulnerability     was fixed in Firefox 150, Firefox ESR 115.35, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.
    (CVE-2026-6749)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of Firefox installed on the remote macOS or Mac OS X host is prior to 150.0. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2026-30 advisory.

  - Incorrect boundary conditions, integer overflow in the Audio/Video: Playback component. This vulnerability     was fixed in Firefox 150 and Thunderbird 150. (CVE-2026-6783)

  - Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 150, Firefox ESR     115.35, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10. (CVE-2026-6746)

  - Use-after-free in the WebRTC component. This vulnerability was fixed in Firefox 150, Firefox ESR 140.10,     Thunderbird 150, and Thunderbird 140.10. (CVE-2026-6747)

  - Uninitialized memory in the Audio/Video: Web Codecs component. This vulnerability was fixed in Firefox     150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10. (CVE-2026-6748, CVE-2026-6751)

  - Information disclosure due to uninitialized memory in the Graphics: Canvas2D component. This vulnerability     was fixed in Firefox 150, Firefox ESR 115.35, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.
    (CVE-2026-6749)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Severity
313177	Linux Distros Unpatched Vulnerability : CVE-2026-8091	Nessus	Misc.	critical
313045	Mozilla Firefox ESR < 115.35.2	Nessus	Windows	critical
313044	Mozilla Firefox ESR < 115.35.2	Nessus	MacOS X Local Security Checks	critical
311287	Mozilla Thunderbird < 140.10.1	Nessus	MacOS X Local Security Checks	critical
311286	Mozilla Thunderbird < 140.10.1	Nessus	Windows	critical
310802	Mozilla Firefox ESR < 140.10.1	Nessus	Windows	critical
310800	Mozilla Firefox ESR < 140.10.1	Nessus	MacOS X Local Security Checks	critical
309100	Mozilla Thunderbird < 150.0	Nessus	Windows	medium
309098	Mozilla Thunderbird < 150.0	Nessus	MacOS X Local Security Checks	medium
307899	Mozilla Firefox < 150.0	Nessus	Windows	medium
307895	Mozilla Firefox < 150.0	Nessus	MacOS X Local Security Checks	medium

Detections

Analytics

CVE-2026-8091

critical

Tenable Plugins

critical

critical

critical

critical

critical

critical

critical

medium

medium

medium

medium