CVE-2026-100791
Received Received - Intake

Use-after-free in Mozilla Firefox

Publication date: 2026-09-29

Last updated on: 2026-09-29

Assigner: Mozilla Corporation

Description
Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox ESR 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published
2026-09-29
Last Modified
2026-09-29
Generated
2026-09-29
AI Q&A
2026-09-29
EPSS Evaluated
N/A
NVD
CVE-2026-100791
EUVD
EUVD-2026-88943

Affected Vendors & Products

Showing 4 associated CPEs
Vendor Product Version / Range
mozilla firefox 153.4
mozilla firefox 157
mozilla firefox 115.42
mozilla firefox 140.17

Helpful Resources

Exploitability

CWE
CWE Icon
KEV
KEV Icon
CWE ID Description
CWE-UNKNOWN

Attack-Flow Graph

AI Quick Actions

Instant insights powered by AI
Executive Summary

This is a use-after-free vulnerability in the DOM Core and HTML components of Firefox. Use-after-free occurs when a program continues to use a pointer after freeing the memory it points to, potentially leading to crashes or arbitrary code execution.

Impact Analysis

An attacker could exploit this to crash your browser or run malicious code on your system. This may allow unauthorized access to data or control of your device if combined with other vulnerabilities.

Mitigation Strategies

Update Firefox to version 157 or later, Firefox ESR 115.42 or later, Firefox ESR 140.17 or later, or Firefox ESR 153.4 or later to address the use-after-free vulnerability in the DOM: Core & HTML component.

Chat Assistant

Ask questions about this CVE
Hi! I’m here to help you understand CVE-2026-100791. Ask me anything about the vulnerability, its impact, or mitigation strategies.
0/70

EPSS Chart