CVE-2026-0880

Sandbox escape due to integer overflow in the Graphics component

High · published January 13, 2026

CVSS v3.1
8.8
EPSS
1%
Percentile
44.8
In the wild
Unconfirmed
What it is

⚡ A sneaky integer overflow in Firefox's Graphics component lets attackers potentially escape the sandbox! 🚨 Think of the sandbox as a playpen for the browser, where nothing should escape. But with this overflow, it’s like finding a hidden door — once open, a mischievous kid can wander off into the rest of the house! If exploited, this vulnerability could allow an attacker to run malicious code outside the confines of the browser's sandbox, leading to unauthorized access and control over the system. This could mean anything from data theft to the installation of malware, making it a serious threat!

Put simply

Think of the sandbox as a playpen for the browser, where nothing should escape. But with this overflow, it’s like finding a hidden door — once open, a mischievous kid can wander off into the rest of the house! CVE-2026-0880 is an integer overflow vulnerability in Firefox's Graphics component that allows for a sandbox escape, enabling attackers to execute code in a less restricted environment than intended.

What to do

If exploited, this vulnerability could allow an attacker to run malicious code outside the confines of the browser's sandbox, leading to unauthorized access and control over the system. This could mean anything from data theft to the installation of malware, making it a serious threat! Upgrade to Firefox version 147, Firefox ESR 115.32, or Thunderbird version 147 to patch this vulnerability immediately. If you're managing a site, ensure all users are on the latest version to defend against potential exploits! You’ve got this! Following these steps will help keep your digital fortress secure! 🛡️

The record
Technical detail
CVSS v3.1
8.8 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00543 · 44.8th percentile
Published
2026-01-13T13:30Z
EPSS history
Timeline
  • 13 JAN 13:30Z
    Sandbox escape due to integer overflow in the Graphics component
    cvelistv5