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Amazon Linux 2023 : firefox (ALAS2023-2026-1429)

high Nessus Plugin ID 299567

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Synopsis

The remote Amazon Linux 2023 host is missing a security update.

Description

It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2023-2026-1429 advisory.

 Spoofing issue in the Downloads Panel component. This vulnerability affects Firefox < 146.
 (CVE-2025-14327)

 Mitigation bypass in the DOM: Security component. This vulnerability affects Firefox < 147, Firefox ESR < 115.32, and Firefox ESR < 140.7. (CVE-2026-0877)

 Sandbox escape due to incorrect boundary conditions in the Graphics: CanvasWebGL component. This vulnerability affects Firefox < 147 and Firefox ESR < 140.7. (CVE-2026-0878)

 Sandbox escape due to incorrect boundary conditions in the Graphics component. This vulnerability affects Firefox < 147, Firefox ESR < 115.32, and Firefox ESR < 140.7. (CVE-2026-0879)

 Sandbox escape due to integer overflow in the Graphics component. This vulnerability affects Firefox < 147, Firefox ESR < 115.32, and Firefox ESR < 140.7. (CVE-2026-0880)

 Use-after-free in the IPC component. This vulnerability affects Firefox < 147, Firefox ESR < 115.32, and Firefox ESR < 140.7. (CVE-2026-0882)

 Information disclosure in the Networking component. This vulnerability affects Firefox < 147 and Firefox ESR < 140.7. (CVE-2026-0883)

 Use-after-free in the JavaScript Engine component. This vulnerability affects Firefox < 147 and Firefox ESR < 140.7. (CVE-2026-0884)

 Use-after-free in the JavaScript: GC component. This vulnerability affects Firefox < 147 and Firefox ESR < 140.7. (CVE-2026-0885)

 Incorrect boundary conditions in the Graphics component. This vulnerability affects Firefox < 147, Firefox ESR < 115.32, and Firefox ESR < 140.7. (CVE-2026-0886)

 Clickjacking issue, information disclosure in the PDF Viewer component. This vulnerability affects Firefox < 147 and Firefox ESR < 140.7. (CVE-2026-0887)

 Spoofing issue in the DOM: Copy & Paste and Drag & Drop component. This vulnerability affects Firefox < 147 and Firefox ESR < 140.7. (CVE-2026-0890)

 Memory safety bugs present in Firefox ESR 140.6, Thunderbird ESR 140.6, Firefox 146 and Thunderbird 146.
 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. This vulnerability affects Firefox < 147 and Firefox ESR < 140.7. (CVE-2026-0891)

Tenable has extracted the preceding description block directly from the tested product 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

Run 'dnf update firefox --releasever 2023.10.20260216' or or 'dnf update --advisory ALAS2023-2026-1429 --releasever 2023.10.20260216' to update your system.

See Also

https://alas.aws.amazon.com//AL2023/ALAS2023-2026-1429.html

https://alas.aws.amazon.com/faqs.html

https://explore.alas.aws.amazon.com/CVE-2025-14327.html

https://explore.alas.aws.amazon.com/CVE-2026-0877.html

https://explore.alas.aws.amazon.com/CVE-2026-0878.html

https://explore.alas.aws.amazon.com/CVE-2026-0879.html

https://explore.alas.aws.amazon.com/CVE-2026-0880.html

https://explore.alas.aws.amazon.com/CVE-2026-0882.html

https://explore.alas.aws.amazon.com/CVE-2026-0883.html

https://explore.alas.aws.amazon.com/CVE-2026-0884.html

https://explore.alas.aws.amazon.com/CVE-2026-0885.html

https://explore.alas.aws.amazon.com/CVE-2026-0886.html

https://explore.alas.aws.amazon.com/CVE-2026-0887.html

https://explore.alas.aws.amazon.com/CVE-2026-0890.html

https://explore.alas.aws.amazon.com/CVE-2026-0891.html

Plugin Details

Severity: High

ID: 299567

File Name: al2023_ALAS2023-2026-1429.nasl

Version: 1.1

Type: local

Agent: unix

Published: 2/19/2026

Updated: 2/19/2026

Supported Sensors: Agentless Assessment, Continuous Assessment, Frictionless Assessment Agent, Frictionless Assessment AWS, Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: High

Score: 7.1

CVSS v2

Risk Factor: High

Base Score: 7.8

Temporal Score: 5.8

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

CVSS Score Source: CVE-2025-14327

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

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

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

Vulnerability Information

CPE: p-cpe:/a:amazon:linux:firefox, p-cpe:/a:amazon:linux:firefox-debugsource, cpe:/o:amazon:linux:2023, p-cpe:/a:amazon:linux:firefox-debuginfo

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

Exploit Ease: No known exploits are available

Patch Publication Date: 2/18/2026

Vulnerability Publication Date: 12/9/2025

Reference Information

CVE: CVE-2025-14327, CVE-2026-0877, CVE-2026-0878, CVE-2026-0879, CVE-2026-0880, CVE-2026-0882, CVE-2026-0883, CVE-2026-0884, CVE-2026-0885, CVE-2026-0886, CVE-2026-0887, CVE-2026-0890, CVE-2026-0891

IAVA: 2025-A-0894-S, 2026-A-0032-S