RHEL 10 : firefox (RHSA-2026:3361)

critical Nessus Plugin ID 299964

Synopsis

The remote Red Hat host is missing one or more security updates for firefox.

Description

The remote Redhat Enterprise Linux 10 host has a package installed that is affected by multiple vulnerabilities as referenced in the RHSA-2026:3361 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.

Solution

Update the RHEL firefox package based on the guidance in RHSA-2026:3361.

Plugin Details

Severity: Critical

ID: 299964

File Name: redhat-RHSA-2026-3361.nasl

Version: 1.1

Type: local

Agent: unix

Family: Red Hat Local Security Checks

Published: 2/25/2026

Updated: 2/25/2026

Supported Sensors: Continuous Assessment, Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: High

Score: 8.4

Vendor

Vendor Severity: Important

CVSS v2

Risk Factor: Critical

Base Score: 10

Temporal Score: 7.4

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C

CVSS Score Source: CVE-2026-2790

CVSS v3

Risk Factor: Critical

Base Score: 10

Temporal Score: 8.7

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

CVSS Score Source: CVE-2026-2778

Vulnerability Information

CPE: cpe:/o:redhat:enterprise_linux:10.1, p-cpe:/a:redhat:enterprise_linux:firefox

Required KB Items: Host/local_checks_enabled, Host/RedHat/release, Host/RedHat/rpm-list, Host/cpu

Exploit Ease: No known exploits are available

Patch Publication Date: 2/25/2026

Vulnerability Publication Date: 2/16/2026

Reference Information

CVE: CVE-2026-2447, CVE-2026-2757, CVE-2026-2758, CVE-2026-2759, CVE-2026-2760, CVE-2026-2761, CVE-2026-2762, CVE-2026-2763, CVE-2026-2764, CVE-2026-2765, CVE-2026-2766, CVE-2026-2767, CVE-2026-2768, CVE-2026-2769, CVE-2026-2770, CVE-2026-2771, CVE-2026-2772, CVE-2026-2773, CVE-2026-2774, CVE-2026-2775, CVE-2026-2776, CVE-2026-2777, CVE-2026-2778, CVE-2026-2779, CVE-2026-2780, CVE-2026-2781, CVE-2026-2782, CVE-2026-2783, CVE-2026-2784, CVE-2026-2785, CVE-2026-2786, CVE-2026-2787, CVE-2026-2788, CVE-2026-2789, CVE-2026-2790, CVE-2026-2791, CVE-2026-2792, CVE-2026-2793

RHSA: 2026:3361

Detections

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