RHEL 10 : firefox (RHSA-2026:89758)

high Nessus Plugin ID 374439

Synopsis

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

Description

The remote Redhat Enterprise Linux 10 host has a package installed that is affected by multiple vulnerabilities as referenced in the RHSA-2026:89758 advisory.

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

Security Fix(es):

* libexpat: denial of service via crafted XML input (CVE-2026-45186)

* expat: expat: Information disclosure via heap buffer over-read in XML_ParseBuffer (CVE-2026-77214)

* firefox: thunderbird: Privilege escalation in the Application Update component (CVE-2026-109704)

* firefox: Use-after-free in the XML component (CVE-2026-109718)

* firefox: Incorrect boundary conditions in the JavaScript Engine component (CVE-2026-109715)

* firefox: firefox: Sandbox escape via incorrect boundary conditions in Win32 widget (CVE-2026-109740)

* firefox: Use-after-free in the Storage: IndexedDB component (CVE-2026-109706)

* firefox: Use-after-free in the Crash Reporting component (CVE-2026-109713)

* firefox: Use-after-free in the DOM: Core & HTML component (CVE-2026-109724)

* firefox: Information disclosure, privilege escalation in the Security: Process Sandboxing component (CVE-2026-109709)

* firefox: Sandbox escape, site isolation issue due to incorrect boundary conditions, use-after-free in the Networking component (CVE-2026-109705)

* firefox: Use-after-free in the JavaScript Engine: JIT component (CVE-2026-109729)

* firefox: Incorrect boundary conditions in the JavaScript Engine component (CVE-2026-109716)

* firefox: Race condition, use-after-free in the Graphics: CanvasWebGL component (CVE-2026-109719)

* firefox: Integer overflow in the Layout: Text and Fonts component (CVE-2026-109723)

* firefox: Sandbox escape due to incorrect boundary conditions in the Networking component (CVE-2026-109708)

* firefox: Use-after-free in the DOM: Bindings (WebIDL) component (CVE-2026-109717)

* firefox: Sandbox escape due to use-after-free in the Networking component (CVE-2026-109707)

* firefox: JIT miscompilation in the JavaScript: WebAssembly component (CVE-2026-109720)

* firefox: Use-after-free in the SVG component (CVE-2026-109726)

* firefox: Integer overflow in the Graphics component (CVE-2026-109730)

* firefox: Use-after-free in the Audio/Video component (CVE-2026-109727)

* firefox: Use-after-free in the DOM: Streams component (CVE-2026-109732)

* firefox: Use-after-free in the DOM: Core & HTML component (CVE-2026-109725)

* firefox: Sandbox escape due to uninitialized memory in the Graphics component (CVE-2026-109712)

* firefox: Use-after-free in the Graphics: Canvas2D component (CVE-2026-109711)

* firefox: JIT miscompilation in the JavaScript Engine: JIT component (CVE-2026-109722)

* firefox: Use-after-free in the DOM: Animation component (CVE-2026-109728)

* firefox: Incorrect boundary conditions in the JavaScript Engine: JIT component (CVE-2026-109721)

Bug Fix(es) and Enhancement(s):

* Firefox ESR 153 rebase [rhel-10.2.z] (JIRA:RHEL-175166)

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 affected firefox package.

Plugin Details

Severity: High

ID: 374439

File Name: redhat-RHSA-2026-89758.nasl

Version: 1.1

Type: Local

Agent: unix

Family: Red Hat Local Security Checks

Published: 10/31/2026

Updated: 10/31/2026

Supported Sensors: Nessus Agent, Continuous Assessment, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 6.3

Percentile: 96.11

Vendor

Vendor Severity: Important

CVSS v2

Risk Factor: High

Base Score: 7.8

Temporal Score: 6.1

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

CVSS Score Source: CVE-2026-45186

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.7

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

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

CVSS v4

Risk Factor: High

Base Score: 8.3

Threat Score: 6.9

Threat Vector: CVSS:4.0/E:P

Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:L/SC:N/SI:N/SA:N

CVSS Score Source: CVE-2026-77214

Vulnerability Information

CPE: cpe:/o:redhat:enterprise_linux:10.2, 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: 10/26/2026

Vulnerability Publication Date: 5/10/2026

Reference Information

CVE: CVE-2026-109704, CVE-2026-109705, CVE-2026-109706, CVE-2026-109707, CVE-2026-109708, CVE-2026-109709, CVE-2026-109711, CVE-2026-109712, CVE-2026-109713, CVE-2026-109715, CVE-2026-109716, CVE-2026-109717, CVE-2026-109718, CVE-2026-109719, CVE-2026-109720, CVE-2026-109721, CVE-2026-109722, CVE-2026-109723, CVE-2026-109724, CVE-2026-109725, CVE-2026-109726, CVE-2026-109727, CVE-2026-109728, CVE-2026-109729, CVE-2026-109730, CVE-2026-109732, CVE-2026-109740, CVE-2026-45186, CVE-2026-77214

CWE: 125, 190, 266, 407, 653, 787, 825, 843, 908

RHSA: 2026:89758

Detections

Analytics

RHEL 10 : firefox (RHSA-2026:89758)

high Nessus Plugin ID 374439

Synopsis

Description

Solution

See Also

Plugin Details

Risk Information

VPR

Vendor

CVSS v2

CVSS v3

CVSS v4

Vulnerability Information

Reference Information