OCTOBER 6, 2026
Live Feed
Back to database
Case File

CVE-2026-100778

CRITICAL · CVSS 9.6 EPSS 0.32%

Source: NVD + CISA KEV + EPSS · Published 2026-09-29 · Last synced 2026-10-06

CyberRota Analysis

AI-Generated

A critical use-after-free vulnerability in the DOM components of Firefox allows for a sandbox escape, potentially enabling attackers to execute arbitrary code outside the browser's security boundaries. Organizations using affected versions of Firefox should prioritize patching to mitigate the risk of exploitation, as this could lead to severe impacts on system integrity and data security. Users of Firefox ESR versions 115.42, 140.17, and 153.4, as well as Firefox 157, are particularly urged to update immediately.

CVE
CVE-2026-100778
Severity
CRITICAL
CVSS
9.6
EPSS
0.32%
Firefox

Original NVD Description

Sandbox escape due to use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.

Related CVEs

Other vulnerabilities affecting the same vendor(s)