RHEL 8 : firefox (RHSA-2026:47105)

critical Nessus Plugin ID 330443

Synopsis

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

Description

The remote Redhat Enterprise Linux 8 host has a package installed that is affected by multiple vulnerabilities as referenced in the RHSA-2026:47105 advisory.

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

Security Fix(es):

* libaom: libaom: heap buffer overflow in AV1 encoder first-pass stats buffer via LAP mode (CVE-2026-56208)

* firefox: thunderbird: Site isolation issue in the DOM: Navigation component (CVE-2026-15719)

* firefox: thunderbird: Invalid pointer in the JavaScript: WebAssembly component (CVE-2026-15718)

* firefox: thunderbird: Mitigation bypass in the Enterprise Policies component (CVE-2026-16390)

* firefox: thunderbird: Incorrect boundary conditions in the Audio/Video: cubeb component (CVE-2026-16350)

* firefox: thunderbird: Information disclosure in the Storage: IndexedDB component (CVE-2026-16391)

* firefox: thunderbird: Site isolation issue in the Networking: HTTP component (CVE-2026-16375)

* firefox: thunderbird: Sandbox escape due to use-after-free in the Disability Access APIs component (CVE-2026-16356)

* firefox: thunderbird: JIT miscompilation in the JavaScript: WebAssembly component (CVE-2026-16363)

* firefox: thunderbird: Memory safety bugs fixed in Firefox ESR 140.13 and Firefox 153 (CVE-2026-16412)

* firefox: thunderbird: Same-origin policy bypass in the Networking: DNS component (CVE-2026-16381)

* firefox: thunderbird: JIT miscompilation in the JavaScript Engine: JIT component (CVE-2026-16355)

* firefox: thunderbird: Memory safety bugs fixed in Firefox ESR 115.38 and Firefox ESR 140.13 (CVE-2026-16361)

* firefox: thunderbird: Sandbox escape due to use-after-free in the Disability Access APIs component (CVE-2026-16352)

* firefox: thunderbird: Incorrect boundary conditions in the JavaScript: WebAssembly component (CVE-2026-16368)

* firefox: thunderbird: Mitigation bypass in the PDF Viewer component (CVE-2026-16377)

* firefox: thunderbird: Memory safety bugs fixed in Firefox ESR 115.38, Firefox ESR 140.13 and Firefox 153 (CVE-2026-16360)

* firefox: thunderbird: Use-after-free in the WebRTC: Audio/Video component (CVE-2026-16362)

* firefox: thunderbird: Site isolation issue in the Graphics: WebRender component (CVE-2026-16358)

* firefox: thunderbird: Site isolation issue in the Networking component (CVE-2026-16387)

* firefox: thunderbird: Same-origin policy bypass in the DOM: Navigation component (CVE-2026-16349)

* firefox: thunderbird: Incorrect boundary conditions in the Graphics component (CVE-2026-16357)

* firefox: thunderbird: Sandbox escape due to use-after-free in the DOM: Navigation component (CVE-2026-16351)

* firefox: thunderbird: Privilege escalation in the DOM: Navigation component (CVE-2026-16371)

* firefox: thunderbird: Privilege escalation in the DOM: Content Processes component (CVE-2026-16379)

* firefox: thunderbird: Information disclosure in the Graphics: ImageLib component (CVE-2026-16354)

* firefox: thunderbird: Information disclosure in the Framework component in DevTools (CVE-2026-16374)

* firefox: thunderbird: Incorrect boundary conditions in the Audio/Video: GMP component (CVE-2026-16359)

* firefox: thunderbird: Mitigation bypass in the DOM: Networking component (CVE-2026-16383)

* firefox: thunderbird: Integer overflow in the JavaScript: WebAssembly component (CVE-2026-16369)

* firefox: thunderbird: Invalid pointer in the DOM: Bindings (WebIDL) component (CVE-2026-16353)

* firefox: thunderbird: Privilege escalation in WebExtensions (CVE-2026-16396)

* firefox: thunderbird: Information disclosure in the Networking: WebSockets component (CVE-2026-16405)

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-2026:47105.

Plugin Details

Severity: Critical

ID: 330443

File Name: redhat-RHSA-2026-47105.nasl

Version: 1.1

Type: Local

Agent: unix

Family: Red Hat Local Security Checks

Published: 7/28/2026

Updated: 7/28/2026

Supported Sensors: Continuous Assessment, Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 6.9

Percentile: 96.84

Vendor

Vendor Severity: Important

CVSS v2

Risk Factor: Critical

Base Score: 10

Temporal Score: 7.8

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

CVSS Score Source: CVE-2026-16412

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 8.8

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

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

Vulnerability Information

CPE: cpe:/o:redhat:enterprise_linux:8, cpe:/o:redhat:rhel_eus:8.10, p-cpe:/a:redhat:enterprise_linux:firefox

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

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 7/28/2026

Vulnerability Publication Date: 6/19/2026

Reference Information

CVE: CVE-2026-15718, CVE-2026-15719, CVE-2026-16349, CVE-2026-16350, CVE-2026-16351, CVE-2026-16352, CVE-2026-16353, CVE-2026-16354, CVE-2026-16355, CVE-2026-16356, CVE-2026-16357, CVE-2026-16358, CVE-2026-16359, CVE-2026-16360, CVE-2026-16361, CVE-2026-16362, CVE-2026-16363, CVE-2026-16368, CVE-2026-16369, CVE-2026-16371, CVE-2026-16374, CVE-2026-16375, CVE-2026-16377, CVE-2026-16379, CVE-2026-16381, CVE-2026-16383, CVE-2026-16387, CVE-2026-16390, CVE-2026-16391, CVE-2026-16396, CVE-2026-16405, CVE-2026-16412, CVE-2026-56208

CWE: 120, 122, 190, 201, 215, 266, 346, 368, 476, 501, 653, 733, 772, 787, 807, 825

RHSA: 2026:47105

Detections

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