Detections
Analytics
Amazon Linux 2023 : firefox (ALAS2023-2026-1469)
high Nessus Plugin ID 301336
Synopsis
The remote Amazon Linux 2023 host is missing a security update.Description
It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2023-2026-1469 advisory.A specially-crafted file can cause libjxl's decoder to read pixel data from uninitialized (but allocated) memory.
This can be done by causing the decoder to reference an outside-image-bound area in a subsequent patches.
An incorrect optimization causes the decoder to omit populating those areas. (CVE-2025-12474)
A specially-crafted file can cause libjxl's decoder to write pixel data to uninitialized unallocated memory. Soon after that data from another uninitialized unallocated region is copied to pixel data.
This can be done by requesting color transformation of grayscale images to another grayscale color space.
Buffers allocated for 1-float-per-pixel are used as if they are allocated for 3-float-per-pixel. That happens only if LCMS2 is used as CMS engine. There is another CMS engine available (selected by build flags). (CVE-2026-1837)
Heap buffer overflow in libvpx. This vulnerability affects Firefox < 147.0.4, Firefox ESR < 140.7.1, Firefox ESR < 115.32.1, Thunderbird < 140.7.2, and Thunderbird < 147.0.2. (CVE-2026-2447)
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 2023.10.20260302' or or 'dnf update --advisory ALAS2023-2026-1469 --releasever 2023.10.20260302' to update your system.See Also
https://alas.aws.amazon.com/faqs.html
https://explore.alas.aws.amazon.com/CVE-2025-12474.html
https://explore.alas.aws.amazon.com/CVE-2026-1837.html
Plugin Details
Severity: High
ID: 301336
File Name: al2023_ALAS2023-2026-1469.nasl
Version: 1.1
Type: local
Agent: unix
Published: 3/6/2026
Updated: 3/6/2026
Supported Sensors: Frictionless Assessment AWS, Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Continuous Assessment, Nessus
Risk Information
VPR
Risk Factor: High
Score: 7.4
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-2026-2447
CVSS v3
Risk Factor: High
Base Score: 8.8
Temporal Score: 7.7
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C
CVSS v4
Risk Factor: High
Base Score: 8.7
Threat Score: 6.3
Threat Vector: CVSS:4.0/E:U
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CVSS Score Source: CVE-2026-1837
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: 3/5/2026
Vulnerability Publication Date: 2/11/2026
Reference Information
CVE: CVE-2025-12474, CVE-2026-1837, CVE-2026-2447
IAVA: 2026-A-0169-S