Detections
Analytics

TencentOS Server 3: firefox (TSSA-2026:0912)

critical Nessus Plugin ID 341101

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-2026:0912 advisory.

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

 CVE-2026-74934:
 A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue:
 Site isolation issue in the Graphics: CanvasWebGL component

 CVE-2026-74935:
 A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue:
 Privilege escalation in the DOM: Networking component

 CVE-2026-74936:
 A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue:
 Use-after-free in the JavaScript: WebAssembly component

 CVE-2026-74939:
 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-2026-74940:
 A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue:
 Use-after-free in the Graphics: Text component

 CVE-2026-74941:
 A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue:
 Privilege escalation in the Graphics: CanvasWebGL component

 CVE-2026-74942:
 A flaw was found in Firefox. The Mozilla Foundation's Security Advisory describes the following issue:
 Privilege escalation in the Remote Settings Client component

 CVE-2026-74943:
 A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue:
 Use-after-free in the Graphics: ImageLib component

 CVE-2026-74944:
 A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue:
 Use-after-free in the DOM: Core & HTML component

 CVE-2026-74945:
 A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue:
 Information disclosure in the Graphics: Text component

 CVE-2026-74946:
 A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue:
 Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component

 CVE-2026-74948:
 A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue:
 Information disclosure in the Graphics component

 CVE-2026-74949:
 A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue:
 Privilege escalation due to use-after-free in the Graphics: Canvas2D component

 CVE-2026-74953:
 A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue:
 Privilege escalation in the Networking: Cookies component

 CVE-2026-74957:
 A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue:
 Mitigation bypass in the Safe Browsing component

 CVE-2026-74959:
 A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue:
 Mitigation bypass in the Storage: Cache API component

 CVE-2026-74960:
 A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue:
 Site isolation issue in the WebExtensions component

 CVE-2026-74962:
 A flaw was found in Firefox. The Mozilla Foundation's Security Advisory describes the following issue:
 Site isolation issue in the Networking: Cookies component

 CVE-2026-74963:
 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: Cookies component

 CVE-2026-74964:
 A flaw was found in Firefox. The Mozilla Foundation's Security Advisory describes the following issue:
 Integer overflow in the Graphics component

 CVE-2026-74965:
 A flaw was found in Firefox. The Mozilla Foundation's Security Advisory describes the following issue:
 Privilege escalation in the Shell Integration component

 CVE-2026-74967:
 A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue:
 Same-origin policy bypass in the Audio/Video: Playback component

 CVE-2026-74969:
 A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue:
 Use-after-free in the Layout: Text and Fonts component

 CVE-2026-74971:
 A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue:
 Information disclosure in the DOM: UI Events & Focus Handling component

 CVE-2026-74972:
 A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue:
 Information disclosure in the DOM: Push Subscriptions component

 CVE-2026-74973:
 A flaw was found in Firefox. The Mozilla Foundation's Security Advisory describes the following issue:
 Race condition, use-after-free in the Graphics component

 CVE-2026-74974:
 A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue:
 Same-origin policy bypass in the Graphics: ImageLib component

 CVE-2026-74976:
 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-2026-74983:
 A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue:
 Mitigation bypass in the Data Loss Prevention component

 CVE-2026-74987:
 A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue:
 Internally found bugs present in Thunderbird ESR 140.13, Thunderbird ESR 153.0 and Thunderbird 153. Some of these bugs showed evidence of memory corruption or another security-relevant defect and we presume that with enough effort some of these could have been exploited.

 CVE-2026-74990:
 A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue:
 Internally found bugs present in Thunderbird ESR 140.13, Thunderbird ESR 153.0 and Thunderbird 153. Some of these bugs showed evidence of memory corruption or another security-relevant defect and we presume that with enough effort some of these could have been exploited.

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-20260912.xml

Plugin Details

Severity: Critical

ID: 341101

File Name: tencentos_TSSA_2026_0912.nasl

Version: 1.1

Type: Local

Published: 8/27/2026

Updated: 8/27/2026

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.9

Percentile: 58.19

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-2026-74944

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/cpu, Host/etc/os-release, Host/TencentOS/rpm-list

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 8/24/2026

Vulnerability Publication Date: 8/18/2026

Reference Information

CVE: CVE-2026-74934, CVE-2026-74935, CVE-2026-74936, CVE-2026-74939, CVE-2026-74940, CVE-2026-74941, CVE-2026-74942, CVE-2026-74943, CVE-2026-74944, CVE-2026-74945, CVE-2026-74946, CVE-2026-74948, CVE-2026-74949, CVE-2026-74953, CVE-2026-74957, CVE-2026-74959, CVE-2026-74960, CVE-2026-74962, CVE-2026-74963, CVE-2026-74964, CVE-2026-74965, CVE-2026-74967, CVE-2026-74969, CVE-2026-74971, CVE-2026-74972, CVE-2026-74973, CVE-2026-74974, CVE-2026-74976, CVE-2026-74983, CVE-2026-74987, CVE-2026-74990

IAVA: 2026-A-0876