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TencentOS Server 3: firefox (TSSA-2026:0820)

critical Nessus Plugin ID 333135

Synopsis

The remote TencentOS Server 3 host is missing one or more security updates.

Description

The version of Tencent Linux installed on the remote TencentOS Server 3 host is prior to tested version. It is, therefore, affected by multiple vulnerabilities as referenced in the TSSA-2026:0820 advisory.

 Package updates are available for TencentOS Server 3 that fix the following vulnerabilities:

 CVE-2026-15718:
 A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue:
 We are aware that exploit code for this is public however we are not aware of any attacks in the wild abusing this flaw.

 CVE-2026-15719:
 A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue:
 We are aware that exploit code for this is public however we are not aware of any attacks in the wild abusing this flaw.

 CVE-2026-16349:
 A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue:
 Same-origin policy bypass in the DOM: Navigation component

 CVE-2026-16350:
 A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue:
 Incorrect boundary conditions in the Audio/Video: cubeb component

 CVE-2026-16351:
 A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue:
 Sandbox escape due to use-after-free in the DOM: Navigation component

 CVE-2026-16352:
 A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue:
 Sandbox escape due to use-after-free in the Disability Access APIs component

 CVE-2026-16353:
 A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue:
 Invalid pointer in the DOM: Bindings (WebIDL) component

 CVE-2026-16354:
 A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue:
 Information disclosure in the Graphics: ImageLib component

 CVE-2026-16355:
 A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue:
 JIT miscompilation in the JavaScript Engine: JIT component

 CVE-2026-16356:
 A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue:
 Sandbox escape due to use-after-free in the Disability Access APIs component

 CVE-2026-16357:
 A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue:
 Incorrect boundary conditions in the Graphics component

 CVE-2026-16358:
 A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue:
 Site isolation issue in the Graphics: WebRender component

 CVE-2026-16359:
 A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue:
 Incorrect boundary conditions in the Audio/Video: GMP component

 CVE-2026-16360:
 A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue:
 Memory safety bugs present in Thunderbird ESR 140.12 and Thunderbird 152. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code.

 CVE-2026-16361:
 A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue:
 Memory safety bugs present in Thunderbird ESR 140.12. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code.

 CVE-2026-16362:
 A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue:
 Use-after-free in the WebRTC: Audio/Video component

 CVE-2026-16363:
 A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue:
 JIT miscompilation in the JavaScript: WebAssembly component

 CVE-2026-16368:
 A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue:
 Incorrect boundary conditions in the JavaScript: WebAssembly component

 CVE-2026-16369:
 A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue:
 Integer overflow in the JavaScript: WebAssembly component

 CVE-2026-16371:
 A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue:
 Privilege escalation in the DOM: Navigation component

 CVE-2026-16374:
 A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue:
 Information disclosure in the Framework component in DevTools

 CVE-2026-16375:
 A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue:
 Site isolation issue in the Networking: HTTP component

 CVE-2026-16377:
 A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue:
 Mitigation bypass in the PDF Viewer component

 CVE-2026-16379:
 A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue:
 Privilege escalation in the DOM: Content Processes component

 CVE-2026-16381:
 A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue:
 Same-origin policy bypass in the Networking: DNS component

 CVE-2026-16383:
 A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue:
 Mitigation bypass in the DOM: Networking component

 CVE-2026-16387:
 A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue:
 Site isolation issue in the Networking component

 CVE-2026-16390:
 A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue:
 Mitigation bypass in the Enterprise Policies component

 CVE-2026-16391:
 A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue:
 Information disclosure in the Storage: IndexedDB component

 CVE-2026-16396:
 A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue:
 Privilege escalation in WebExtensions

 CVE-2026-16405:
 A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue:
 Information disclosure in the Networking: WebSockets component

 CVE-2026-16412:
 A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue:
 Memory safety bugs present in Thunderbird ESR 140.12 and Thunderbird 152. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code.

 CVE-2026-56208:
 A heap buffer overflow vulnerability was found in libaom, the reference AV1 codec implementation. A flaw in the AV1 encoder's Look-Ahead Processing (LAP) mode causes the first-pass stats ring buffer wrap-around guard to be bypassed when g_lag_in_frames is set to 1 or higher. This results in a 232-byte out-of-bounds write on every encoded frame after the second, corrupting adjacent heap objects. An attacker who can influence encoder configuration in a transcoding service or WebRTC session could exploit this to cause a denial of service (process crash) or potentially achieve code execution.

Tenable has extracted the preceding description block directly from the Tencent 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 packages.

See Also

https://mirrors.tencent.com/tlinux/errata/tssa-20260820.xml

Plugin Details

Severity: Critical

ID: 333135

File Name: tencentos_TSSA_2026_0820.nasl

Version: 1.1

Type: Local

Published: 8/6/2026

Updated: 8/6/2026

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.9

Percentile: 58.13

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:tencent:tencentos_server:3, p-cpe:/a:tencent:tencentos_server:firefox

Required KB Items: Host/local_checks_enabled, Host/etc/os-release, Host/TencentOS/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

IAVA: 2026-A-0695-S, 2026-A-0755