Other issue in the JavaScript Engine component. This vulnerability was fixed in Firefox 150.0.3.

fedora FEDORA-2026-4542b2d7aa: firefox-150.0.3-1.fc43

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

  - Other issue in the JavaScript Engine component. This vulnerability was fixed in Firefox 150.0.3.
    (CVE-2026-8391)

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

The remote Fedora 44 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-67917a57a3 advisory.

    - Updated to latest upstream (150.0.3)

Tenable has extracted the preceding description block directly from the Fedora security advisory.

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 150.0.3. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2026-45 advisory.

  - Sandbox escape in the Profile Backup component. This vulnerability was fixed in Firefox 150.0.3.
    (CVE-2026-8401)

  - Use-after-free in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox 150.0.3.
    (CVE-2026-8390)

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 150.0.3. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2026-45 advisory.

  - Sandbox escape in the Profile Backup component. This vulnerability was fixed in Firefox 150.0.3.
    (CVE-2026-8401)

  - Use-after-free in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox 150.0.3.
    (CVE-2026-8390)

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
314664	Linux Distros Unpatched Vulnerability : CVE-2026-8391	Nessus	Misc.	medium
314530	Fedora 44 : firefox (2026-67917a57a3)	Nessus	Fedora Local Security Checks	critical
314317	Mozilla Firefox < 150.0.3	Nessus	Windows	critical
314316	Mozilla Firefox < 150.0.3	Nessus	MacOS X Local Security Checks	critical

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