Heap buffer overflow in libvpx. This vulnerability affects Firefox < 147.0.4, Firefox ESR < 140.7.1, Firefox ESR < 115.32.1, Thunderbird < 140.7.2, and Thunderbird < 147.0.2.

The version of mozilla-thunderbird installed on the remote host is prior to 140.7.2esr. It is, therefore, affected by a vulnerability as referenced in the SSA:2026-047-04 advisory.

    New mozilla-thunderbird packages are available for Slackware 15.0 and -current to fix a security issue.

Tenable has extracted the preceding description block directly from the mozilla-thunderbird security advisory.

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

The version of mozilla-firefox installed on the remote host is prior to 140.7.1esr. It is, therefore, affected by a vulnerability as referenced in the SSA:2026-047-03 advisory.

    New mozilla-firefox packages are available for Slackware 15.0 and -current to fix a security issue.

Tenable has extracted the preceding description block directly from the mozilla-firefox security advisory.

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

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

  - Heap buffer overflow in libvpx. This vulnerability affects Firefox < 147.0.4, Firefox ESR < 140.7.1,     Firefox ESR < 115.32.1, Thunderbird < 140.7.2, and Thunderbird < 147.0.2. (CVE-2026-2447)

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

The version of Thunderbird installed on the remote Windows host is prior to 147.0.2. It is, therefore, affected by a vulnerability as referenced in the mfsa2026-11 advisory.

  - Heap buffer overflow in libvpx. This vulnerability affects Firefox < 147.0.4, Firefox ESR < 140.7.1,     Firefox ESR < 115.32.1, Thunderbird < 140.7.2, and Thunderbird < 147.0.2. (CVE-2026-2447)

Note that Nessus has not tested for this issue 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 115.32.1. It is, therefore, affected by a vulnerability as referenced in the mfsa2026-10 advisory.

  - Heap buffer overflow in libvpx. This vulnerability affects Firefox < 147.0.4, Firefox ESR < 140.7.1,     Firefox ESR < 115.32.1, Thunderbird < 140.7.2, and Thunderbird < 147.0.2. (CVE-2026-2447)

Note that Nessus has not tested for this issue 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 147.0.2. It is, therefore, affected by a vulnerability as referenced in the mfsa2026-11 advisory.

  - Heap buffer overflow in libvpx. This vulnerability affects Firefox < 147.0.4, Firefox ESR < 140.7.1,     Firefox ESR < 115.32.1, Thunderbird < 140.7.2, and Thunderbird < 147.0.2. (CVE-2026-2447)

Note that Nessus has not tested for this issue 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 140.7.2. It is, therefore, affected by a vulnerability as referenced in the mfsa2026-11 advisory.

  - Heap buffer overflow in libvpx. This vulnerability affects Firefox < 147.0.4, Firefox ESR < 140.7.1,     Firefox ESR < 115.32.1, Thunderbird < 140.7.2, and Thunderbird < 147.0.2. (CVE-2026-2447)

Note that Nessus has not tested for this issue 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 147.0.4. It is, therefore, affected by a vulnerability as referenced in the mfsa2026-10 advisory.

  - Heap buffer overflow in libvpx. This vulnerability affects Firefox < 147.0.4, Firefox ESR < 140.7.1,     Firefox ESR < 115.32.1, Thunderbird < 140.7.2, and Thunderbird < 147.0.2. (CVE-2026-2447)

Note that Nessus has not tested for this issue 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 140.7.1. It is, therefore, affected by a vulnerability as referenced in the mfsa2026-10 advisory.

  - Heap buffer overflow in libvpx. This vulnerability affects Firefox < 147.0.4, Firefox ESR < 140.7.1,     Firefox ESR < 115.32.1, Thunderbird < 140.7.2, and Thunderbird < 147.0.2. (CVE-2026-2447)

Note that Nessus has not tested for this issue 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 115.32.1. It is, therefore, affected by a vulnerability as referenced in the mfsa2026-10 advisory.

  - Heap buffer overflow in libvpx. This vulnerability affects Firefox < 147.0.4, Firefox ESR < 140.7.1,     Firefox ESR < 115.32.1, Thunderbird < 140.7.2, and Thunderbird < 147.0.2. (CVE-2026-2447)

Note that Nessus has not tested for this issue 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 140.7.2. It is, therefore, affected by a vulnerability as referenced in the mfsa2026-11 advisory.

  - Heap buffer overflow in libvpx. This vulnerability affects Firefox < 147.0.4, Firefox ESR < 140.7.1,     Firefox ESR < 115.32.1, Thunderbird < 140.7.2, and Thunderbird < 147.0.2. (CVE-2026-2447)

Note that Nessus has not tested for this issue 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 140.7.1. It is, therefore, affected by a vulnerability as referenced in the mfsa2026-10 advisory.

  - Heap buffer overflow in libvpx. This vulnerability affects Firefox < 147.0.4, Firefox ESR < 140.7.1,     Firefox ESR < 115.32.1, Thunderbird < 140.7.2, and Thunderbird < 147.0.2. (CVE-2026-2447)

Note that Nessus has not tested for this issue 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 147.0.4. It is, therefore, affected by a vulnerability as referenced in the mfsa2026-10 advisory.

  - Heap buffer overflow in libvpx. This vulnerability affects Firefox < 147.0.4, Firefox ESR < 140.7.1,     Firefox ESR < 115.32.1, Thunderbird < 140.7.2, and Thunderbird < 147.0.2. (CVE-2026-2447)

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

ID	Name	Product	Family	Severity
299280	Slackware Linux 15.0 / current mozilla-thunderbird Vulnerability (SSA:2026-047-04)	Nessus	Slackware Local Security Checks	high
299278	Slackware Linux 15.0 / current mozilla-firefox Vulnerability (SSA:2026-047-03)	Nessus	Slackware Local Security Checks	high
299233	Linux Distros Unpatched Vulnerability : CVE-2026-2447	Nessus	Misc.	high
299214	Mozilla Thunderbird < 147.0.2	Nessus	Windows	high
299213	Mozilla Firefox ESR < 115.32.1	Nessus	MacOS X Local Security Checks	high
299212	Mozilla Thunderbird < 147.0.2	Nessus	MacOS X Local Security Checks	high
299211	Mozilla Thunderbird < 140.7.2	Nessus	Windows	high
299210	Mozilla Firefox < 147.0.4	Nessus	Windows	high
299209	Mozilla Firefox ESR < 140.7.1	Nessus	MacOS X Local Security Checks	high
299208	Mozilla Firefox ESR < 115.32.1	Nessus	Windows	high
299207	Mozilla Thunderbird < 140.7.2	Nessus	MacOS X Local Security Checks	high
299206	Mozilla Firefox ESR < 140.7.1	Nessus	Windows	high
299205	Mozilla Firefox < 147.0.4	Nessus	MacOS X Local Security Checks	high

Detections

Analytics

CVE-2026-2447

high

Tenable Plugins

high

high

high

high

high

high

high

high

high

high

high

high

high