Linux Distros Unpatched Vulnerability : CVE-2026-2763

critical Nessus Plugin ID 300013

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 JavaScript Engine component. This vulnerability affects Firefox < 148, Firefox ESR < 115.33, Firefox ESR < 140.8, Thunderbird < 148, and Thunderbird < 140.8. (CVE-2026-2763)

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

Solution

There is no known solution at this time.

Plugin Details

Severity: Critical

ID: 300013

File Name: unpatched_CVE_2026_2763.nasl

Version: 1.1

Type: local

Agent: unix

Family: Misc.

Published: 2/26/2026

Updated: 2/26/2026

Supported Sensors: Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: High

Score: 8.4

CVSS v2

Risk Factor: Medium

Base Score: 6.8

Temporal Score: 5.8

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

CVSS Score Source: CVE-2026-2763

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: cpe:/o:centos:centos:7, cpe:/o:debian:debian_linux:11.0, p-cpe:/a:redhat:enterprise_linux:thunderbird-flatpak, p-cpe:/a:redhat:enterprise_linux:firefox-flatpak, cpe:/o:redhat:enterprise_linux:7, cpe:/o:redhat:enterprise_linux:9, p-cpe:/a:redhat:enterprise_linux:thunderbird, cpe:/o:redhat:enterprise_linux:8, p-cpe:/a:centos:centos:thunderbird, p-cpe:/a:centos:centos:firefox, cpe:/o:centos:centos:8, cpe:/o:debian:debian_linux:14.0, p-cpe:/a:debian:debian_linux:firefox-esr, p-cpe:/a:centos:centos:thunderbird-flatpak, p-cpe:/a:redhat:enterprise_linux:firefox, p-cpe:/a:centos:centos:firefox-flatpak, cpe:/o:redhat:enterprise_linux:10

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

Exploit Ease: No known exploits are available

Vulnerability Publication Date: 2/24/2026

Reference Information

CVE: CVE-2026-2763

Detections

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