RHEL 9 : thunderbird (RHSA-2026:70642)

critical Nessus Plugin ID 349631

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Synopsis

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

Description

The remote Redhat Enterprise Linux 9 host has a package installed that is affected by multiple vulnerabilities as referenced in the RHSA-2026:70642 advisory.

Mozilla Thunderbird is a standalone mail and newsgroup client.

Security Fix(es):

* 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)

* thunderbird: Uninitialized memory in MIME parsing (CVE-2026-84639)

* thunderbird: Information disclosure due to malicious IMAP server response (CVE-2026-84641)

* thunderbird: One byte overflow read in mail parser (CVE-2026-84640)

* firefox: thunderbird: Use-after-free in the SVG component (CVE-2026-92024)

* firefox: thunderbird: Mitigation bypass in the Remote Settings Client component (CVE-2026-92019)

* firefox: thunderbird: Use-after-free in the Networking component (CVE-2026-92026)

* firefox: thunderbird: Information disclosure in the Graphics: ImageLib component (CVE-2026-92031)

* firefox: thunderbird: Sandbox escape due to invalid pointer in the Graphics component (CVE-2026-92032)

* firefox: thunderbird: Privilege escalation due to incorrect boundary conditions in the Graphics:
CanvasWebGL component (CVE-2026-92010)

* firefox: thunderbird: Privilege escalation due to incorrect boundary conditions in the Graphics:
CanvasWebGL component (CVE-2026-92006)

* firefox: thunderbird: Privilege escalation due to incorrect boundary conditions in the Graphics:
CanvasWebGL component (CVE-2026-92011)

* firefox: thunderbird: Use-after-free in the DOM: Streams component (CVE-2026-92027)

* firefox: thunderbird: Use-after-free in the DOM: Core & HTML component (CVE-2026-92028)

* firefox: thunderbird: Privilege escalation in the WebExtensions component (CVE-2026-92015)

* firefox: thunderbird: Privilege escalation due to incorrect boundary conditions in the Graphics:
CanvasWebGL component (CVE-2026-92013)

* firefox: thunderbird: Use-after-free in the Disability Access APIs component (CVE-2026-92016)

* firefox: thunderbird: Privilege escalation due to incorrect boundary conditions in the Graphics:
CanvasWebGL component (CVE-2026-92012)

* firefox: thunderbird: Use-after-free in the DOM: HTML Parser component (CVE-2026-92022)

* firefox: thunderbird: Privilege escalation due to incorrect boundary conditions in the Graphics component (CVE-2026-92014)

* firefox: thunderbird: Sandbox escape in the DOM: Core & HTML component (CVE-2026-92018)

* firefox: thunderbird: Use-after-free in the JavaScript Engine: JIT component (CVE-2026-92021)

* firefox: thunderbird: Use-after-free in the Audio/Video: Web Codecs component (CVE-2026-92005)

* firefox: thunderbird: Privilege escalation in the DOM: Service Workers component (CVE-2026-92017)

* firefox: thunderbird: Privilege escalation due to incorrect boundary conditions in the Graphics:
CanvasWebGL component (CVE-2026-92009)

* firefox: thunderbird: Privilege escalation due to incorrect boundary conditions in the Graphics:
WebRender component (CVE-2026-92020)

* firefox: thunderbird: Privilege escalation due to incorrect boundary conditions in the Graphics:
CanvasWebGL component (CVE-2026-92008)

* firefox: thunderbird: Mitigation bypass in the DOM: Copy & Paste and Drag & Drop component (CVE-2026-92030)

* firefox: thunderbird: Privilege escalation due to incorrect boundary conditions in the Graphics:
CanvasWebGL component (CVE-2026-92007)

* firefox: thunderbird: Use-after-free in the DOM: Navigation component (CVE-2026-92025)

* firefox: thunderbird: Use-after-free in the SVG component (CVE-2026-92029)

* firefox: thunderbird: Use-after-free in the XML component (CVE-2026-92023)

* thunderbird: Out-of-bounds read in IMAP response parser (CVE-2026-92240)

* thunderbird: Thunderbird: Out-of-bounds read via maliciously constructed IMAP line (CVE-2026-92239)

* thunderbird: Thunderbird: Memory safety violations via maliciously crafted mail headers (CVE-2026-92238)

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 thunderbird package based on the guidance in RHSA-2026:70642.

Plugin Details

Severity: Critical

ID: 349631

File Name: redhat-RHSA-2026-70642.nasl

Version: 1.2

Type: Local

Agent: unix

Family: Red Hat Local Security Checks

Published: 9/24/2026

Updated: 9/25/2026

Supported Sensors: Frictionless Assessment AWS, Frictionless Assessment Azure, Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Continuous Assessment, Tenable Cloud Security, Tenable Self-Hosted Container Security, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 5

Percentile: 93.74

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-2026-84143

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:redhat:enterprise_linux:9, cpe:/o:redhat:rhel_eus:9.8, p-cpe:/a:redhat:enterprise_linux:thunderbird

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: 9/24/2026

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, CVE-2026-84639, CVE-2026-84640, CVE-2026-84641, CVE-2026-92005, CVE-2026-92006, CVE-2026-92007, CVE-2026-92008, CVE-2026-92009, CVE-2026-92010, CVE-2026-92011, CVE-2026-92012, CVE-2026-92013, CVE-2026-92014, CVE-2026-92015, CVE-2026-92016, CVE-2026-92017, CVE-2026-92018, CVE-2026-92019, CVE-2026-92020, CVE-2026-92021, CVE-2026-92022, CVE-2026-92023, CVE-2026-92024, CVE-2026-92025, CVE-2026-92026, CVE-2026-92027, CVE-2026-92028, CVE-2026-92029, CVE-2026-92030, CVE-2026-92031, CVE-2026-92032, CVE-2026-92238, CVE-2026-92239, CVE-2026-92240

CWE: 125, 266, 476, 497, 653, 787, 791, 807, 824, 825, 843

IAVA: 2026-A-1017

RHSA: 2026:70642

Detections

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