RHEL 10 : firefox (RHSA-2026:5931)

critical Nessus Plugin ID 303808

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-2026:5931 advisory.

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

Security Fix(es):

* firefox: thunderbird: Use-after-free in the JavaScript Engine component (CVE-2026-4701)

* firefox: thunderbird: Memory safety bugs fixed in Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird ESR 140.9, Firefox 149 and Thunderbird 149 (CVE-2026-4721)

* firefox: thunderbird: Privilege escalation in the Netmonitor component (CVE-2026-4717)

* firefox: thunderbird: Sandbox escape due to use-after-free in the Disability Access APIs component (CVE-2026-4688)

* firefox: thunderbird: Incorrect boundary conditions in the Graphics: Canvas2D component (CVE-2026-4706)

* firefox: thunderbird: Incorrect boundary conditions in the Audio/Video: Web Codecs component (CVE-2026-4695)

* firefox: thunderbird: Sandbox escape due to incorrect boundary conditions, integer overflow in the XPCOM component (CVE-2026-4689)

* firefox: thunderbird: JIT miscompilation in the JavaScript Engine: JIT component (CVE-2026-4698)

* firefox: thunderbird: Incorrect boundary conditions, uninitialized memory in the JavaScript Engine component (CVE-2026-4716)

* firefox: thunderbird: Race condition, use-after-free in the Graphics: WebRender component (CVE-2026-4684)

* firefox: thunderbird: Undefined behavior in the WebRTC: Signaling component (CVE-2026-4705)

* firefox: thunderbird: Uninitialized memory in the Graphics: Canvas2D component (CVE-2026-4715)

* firefox: thunderbird: Incorrect boundary conditions in the Graphics: Canvas2D component (CVE-2026-4685)

* firefox: thunderbird: Incorrect boundary conditions in the Audio/Video component (CVE-2026-4714)

* firefox: thunderbird: Incorrect boundary conditions in the Audio/Video: GMP component (CVE-2026-4709)

* firefox: thunderbird: Incorrect boundary conditions in the Audio/Video component (CVE-2026-4710)

* firefox: thunderbird: Information disclosure in the Widget: Cocoa component (CVE-2026-4712)

* firefox: thunderbird: Incorrect boundary conditions in the Audio/Video: Web Codecs component (CVE-2026-4697)

* firefox: thunderbird: Incorrect boundary conditions in the Graphics component (CVE-2026-4713)

* firefox: thunderbird: Sandbox escape due to incorrect boundary conditions, integer overflow in the XPCOM component (CVE-2026-4690)

* firefox: thunderbird: Use-after-free in the Widget: Cocoa component (CVE-2026-4711)

* firefox: thunderbird: Incorrect boundary conditions in the Graphics: Canvas2D component (CVE-2026-4686)

* firefox: thunderbird: Incorrect boundary conditions in the Graphics component (CVE-2026-4708)

* firefox: thunderbird: Use-after-free in the CSS Parsing and Computation component (CVE-2026-4691)

* firefox: thunderbird: Incorrect boundary conditions in the Layout: Text and Fonts component (CVE-2026-4699)

* firefox: thunderbird: Use-after-free in the Layout: Text and Fonts component (CVE-2026-4696)

* firefox: thunderbird: Incorrect boundary conditions in the Audio/Video: Playback component (CVE-2026-4693)

* firefox: thunderbird: Undefined behavior in the WebRTC: Signaling component (CVE-2026-4718)

* firefox: thunderbird: JIT miscompilation in the JavaScript Engine component (CVE-2026-4702)

* firefox: thunderbird: Incorrect boundary conditions in the Graphics: Text component (CVE-2026-4719)

* firefox: thunderbird: Incorrect boundary conditions, integer overflow in the Graphics component (CVE-2026-4694)

* firefox: thunderbird: Sandbox escape in the Responsive Design Mode component (CVE-2026-4692)

* firefox: thunderbird: Memory safety bugs fixed in Firefox ESR 140.9, Thunderbird ESR 140.9, Firefox 149 and Thunderbird 149 (CVE-2026-4720)

* firefox: thunderbird: Mitigation bypass in the Networking: HTTP component (CVE-2026-4700)

* firefox: thunderbird: Incorrect boundary conditions in the Graphics: Canvas2D component (CVE-2026-4707)

* firefox: thunderbird: Denial-of-service in the WebRTC: Signaling component (CVE-2026-4704)

* firefox: thunderbird: Sandbox escape due to incorrect boundary conditions in the Telemetry component (CVE-2026-4687)

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-2026:5931.

Plugin Details

Severity: Critical

ID: 303808

File Name: redhat-RHSA-2026-5931.nasl

Version: 1.1

Type: local

Agent: unix

Family: Red Hat Local Security Checks

Published: 3/26/2026

Updated: 3/26/2026

Supported Sensors: Agentless Assessment, Continuous Assessment, Frictionless Assessment Agent, Frictionless Assessment AWS, Frictionless Assessment Azure, Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: High

Score: 7.4

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-2026-4717

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-2026-4692

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: 3/26/2026

Vulnerability Publication Date: 3/4/2026

Reference Information

CVE: CVE-2026-4684, CVE-2026-4685, CVE-2026-4686, CVE-2026-4687, CVE-2026-4688, CVE-2026-4689, CVE-2026-4690, CVE-2026-4691, CVE-2026-4692, CVE-2026-4693, CVE-2026-4694, CVE-2026-4695, CVE-2026-4696, CVE-2026-4697, CVE-2026-4698, CVE-2026-4699, CVE-2026-4700, CVE-2026-4701, CVE-2026-4702, CVE-2026-4704, CVE-2026-4705, CVE-2026-4706, CVE-2026-4707, CVE-2026-4708, CVE-2026-4709, CVE-2026-4710, CVE-2026-4711, CVE-2026-4712, CVE-2026-4713, CVE-2026-4714, CVE-2026-4715, CVE-2026-4716, CVE-2026-4717, CVE-2026-4718, CVE-2026-4719, CVE-2026-4720, CVE-2026-4721

CWE: 120, 125, 131, 190, 266, 359, 364, 444, 475, 501, 653, 733, 770, 787, 805, 823, 824, 825

RHSA: 2026:5931

Detections

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