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AlmaLinux 9 : firefox (ALSA-2026:67133)

critical Nessus Plugin ID 349474

Synopsis

The remote AlmaLinux host is missing one or more security updates.

Description

The remote AlmaLinux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the ALSA-2026:67133 advisory.

 * firefox: thunderbird: Privilege escalation in the DOM: Workers component (CVE-2026-16365)
 * firefox: thunderbird: Sandbox escape in the Remote Settings Client component (CVE-2026-75874)
 * firefox: Sandbox escape due to use-after-free in the DOM: Security component (CVE-2026-84121)
 * firefox: Internally found bugs fixed in Firefox 155, Firefox ESR 153.2, Firefox ESR 140.15 and Firefox ESR 115.40 (CVE-2026-84145)
 * firefox: Sandbox escape due to use-after-free in the DOM: Navigation component (CVE-2026-84119)
 * firefox: Use-after-free in the Audio/Video component (CVE-2026-84120)
 * firefox: Privilege escalation due to invalid pointer in the Graphics component (CVE-2026-84131)
 * firefox: Use-after-free in the DOM: Core & HTML component (CVE-2026-84124)
 * firefox: Use-after-free in the Audio/Video component (CVE-2026-84122)
 * firefox: Internally found bugs fixed in Firefox 155, Firefox ESR 153.2 and Firefox ESR 140.15 (CVE-2026-84143)

Tenable has extracted the preceding description block directly from the AlmaLinux 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 and / or firefox-x11 packages.

See Also

https://access.redhat.com/errata/RHSA-2026:67133

https://errata.almalinux.org/9/ALSA-2026-67133.html

Plugin Details

Severity: Critical

ID: 349474

File Name: alma_linux_ALSA-2026-67133.nasl

Version: 1.1

Type: Local

Published: 9/23/2026

Updated: 9/23/2026

Supported Sensors: Continuous Assessment, Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 5

Percentile: 93.74

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-2026-84143

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 8.5

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:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:alma:linux:9, cpe:/o:alma:linux:9::appstream, cpe:/o:alma:linux:9::baseos, cpe:/o:alma:linux:9::crb, cpe:/o:alma:linux:9::highavailability, cpe:/o:alma:linux:9::nfv, cpe:/o:alma:linux:9::realtime, cpe:/o:alma:linux:9::resilientstorage, cpe:/o:alma:linux:9::sap, cpe:/o:alma:linux:9::sap_hana, cpe:/o:alma:linux:9::supplementary, p-cpe:/a:alma:linux:firefox-x11, p-cpe:/a:alma:linux:firefox

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

Exploit Ease: No known exploits are available

Patch Publication Date: 9/14/2026

Vulnerability Publication Date: 7/21/2026

Reference Information

CVE: CVE-2026-16365, CVE-2026-75874, CVE-2026-84119, CVE-2026-84120, CVE-2026-84121, CVE-2026-84122, CVE-2026-84124, CVE-2026-84131, CVE-2026-84143, CVE-2026-84145

CWE: 266, 653, 787, 825

RHSA: 2026:67133