The remote Redhat Enterprise Linux 8 host has a package installed that is affected by multiple vulnerabilities as referenced in the RHSA-2026:3338 advisory.

    Mozilla Firefox is an open-source web browser, designed for standards compliance, performance, and     portability.

    Security Fix(es):

    * libvpx: Heap buffer overflow in libvpx (CVE-2026-2447)

    * firefox: Invalid pointer in the JavaScript Engine component (CVE-2026-2785)

    * firefox: Memory safety bugs fixed in Firefox ESR 115.33, Firefox ESR 140.8, Thunderbird ESR 140.8,     Firefox 148 and Thunderbird 148 (CVE-2026-2793)

    * firefox: Undefined behavior in the DOM: Core & HTML component (CVE-2026-2771)

    * firefox: Integer overflow in the Audio/Video component (CVE-2026-2774)

    * firefox: Sandbox escape due to incorrect boundary conditions in the Telemetry component in External     Software (CVE-2026-2776)

    * firefox: Integer overflow in the Libraries component in NSS (CVE-2026-2781)

    * firefox: Use-after-free in the JavaScript Engine: JIT component (CVE-2026-2766)

    * firefox: Use-after-free in the Storage: IndexedDB component (CVE-2026-2769)

    * firefox: Use-after-free in the DOM: Window and Location component (CVE-2026-2787)

    * firefox: Sandbox escape in the Storage: IndexedDB component (CVE-2026-2768)

    * firefox: Information disclosure due to JIT miscompilation in the JavaScript Engine: JIT component     (CVE-2026-2783)

    * firefox: Incorrect boundary conditions in the Audio/Video: GMP component (CVE-2026-2788)

    * firefox: Mitigation bypass in the DOM: Security component (CVE-2026-2784)

    * firefox: Incorrect boundary conditions in the Graphics: ImageLib component (CVE-2026-2759)

    * firefox: Integer overflow in the JavaScript: Standard Library component (CVE-2026-2762)

    * firefox: Sandbox escape in the Graphics: WebRender component (CVE-2026-2761)

    * firefox: Privilege escalation in the Messaging System component (CVE-2026-2777)

    * firefox: Same-origin policy bypass in the Networking: JAR component (CVE-2026-2790)

    * firefox: Mitigation bypass in the DOM: HTML Parser component (CVE-2026-2775)

    * firefox: Use-after-free in the JavaScript Engine component (CVE-2026-2763)

    * firefox: Memory safety bugs fixed in Firefox ESR 140.8, Thunderbird ESR 140.8, Firefox 148 and     Thunderbird 148 (CVE-2026-2792)

    * firefox: Incorrect boundary conditions in the Web Audio component (CVE-2026-2773)

    * firefox: Use-after-free in the JavaScript Engine component (CVE-2026-2786)

    * firefox: Use-after-free in the Graphics: ImageLib component (CVE-2026-2789)

    * firefox: thunderbird: Incorrect boundary conditions in the WebRTC: Audio/Video component (CVE-2026-2757)

    * firefox: Sandbox escape due to incorrect boundary conditions in the Graphics: WebRender component     (CVE-2026-2760)

    * firefox: Use-after-free in the Audio/Video: Playback component (CVE-2026-2772)

    * firefox: Incorrect boundary conditions in the Networking: JAR component (CVE-2026-2779)

    * firefox: Use-after-free in the JavaScript: WebAssembly component (CVE-2026-2767)

    * firefox: JIT miscompilation, use-after-free in the JavaScript Engine: JIT component (CVE-2026-2764)

    * firefox: Privilege escalation in the Netmonitor component (CVE-2026-2782)

    * firefox: Use-after-free in the JavaScript Engine component (CVE-2026-2765)

    * firefox: Privilege escalation in the Netmonitor component (CVE-2026-2780)

    * firefox: Sandbox escape due to incorrect boundary conditions in the DOM: Core & HTML component     (CVE-2026-2778)

    * firefox: Use-after-free in the JavaScript: GC component (CVE-2026-2758)

    * firefox: Mitigation bypass in the Networking: Cache component (CVE-2026-2791)

    * firefox: Use-after-free in the DOM: Bindings (WebIDL) component (CVE-2026-2770)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

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

Detections

Analytics

RHEL 8 : firefox (RHSA-2026:3338)

critical Nessus Plugin ID 300084

Version 1.3

Version 1.2

Version 1.1

Version 1.3 May 1, 2026, 7:22 AM IAVM reference Plugin Feed: 202605010722
Version 1.2 Mar 7, 2026, 12:24 AM IAVM reference STIG Severity (set to "I") Plugin Feed: 202603070024
Version 1.1 Feb 28, 2026, 9:10 AM New Plugin Feed: 202602280910