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Linux Distros Unpatched Vulnerability : CVE-2026-4696

critical Nessus Plugin ID 303555

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Synopsis

The Linux/Unix host has one or more packages installed with a vulnerability that the vendor indicates will not be patched.

Description

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

 - Use-after-free in the Layout: Text and Fonts component. This vulnerability affects Firefox < 149, Firefox ESR < 115.34, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9. (CVE-2026-4696)

Note that Nessus relies on the presence of the package as reported by the vendor.

Solution

There is no known solution at this time.

See Also

https://access.redhat.com/security/cve/cve-2026-4696

https://ubuntu.com/security/CVE-2026-4696

Plugin Details

Severity: Critical

ID: 303555

File Name: unpatched_CVE_2026_4696.nasl

Version: 1.19

Type: Local

Agent: unix

Family: Misc.

Published: 3/25/2026

Updated: 4/9/2026

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

Risk Information

VPR

Risk Factor: Medium

Score: 6.7

CVSS v2

Risk Factor: Critical

Base Score: 10

Temporal Score: 8.5

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

CVSS Score Source: CVE-2026-4696

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 9

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:U/RC:C

Vulnerability Information

CPE: p-cpe:/a:centos:centos:firefox, p-cpe:/a:redhat:enterprise_linux:firefox, p-cpe:/a:canonical:ubuntu_linux:thunderbird, cpe:/o:canonical:ubuntu_linux:24.04:-:lts, cpe:/o:redhat:enterprise_linux:10, p-cpe:/a:redhat:enterprise_linux:firefox-flatpak, p-cpe:/a:canonical:ubuntu_linux:mozjs38, p-cpe:/a:canonical:ubuntu_linux:mozjs68, p-cpe:/a:canonical:ubuntu_linux:mozjs91, p-cpe:/a:centos:centos:firefox-flatpak, cpe:/o:centos:centos:7, cpe:/o:redhat:enterprise_linux:7, cpe:/o:canonical:ubuntu_linux:18.04:-:lts, cpe:/o:canonical:ubuntu_linux:20.04:-:lts, cpe:/o:canonical:ubuntu_linux:22.04:-:lts, p-cpe:/a:redhat:enterprise_linux:thunderbird-flatpak, p-cpe:/a:canonical:ubuntu_linux:mozjs52, p-cpe:/a:canonical:ubuntu_linux:mozjs78, p-cpe:/a:canonical:ubuntu_linux:mozjs102, p-cpe:/a:canonical:ubuntu_linux:mozjs115, p-cpe:/a:centos:centos:thunderbird-flatpak

Required KB Items: Host/local_checks_enabled, Host/cpu, global_settings/vendor_unpatched, Host/OS/identifier

Exploit Ease: No known exploits are available

Vulnerability Publication Date: 3/24/2026

Reference Information

CVE: CVE-2026-4696