CVE-2026-100797
Received Received - Intake

Privilege Escalation via Use-After-Free in Firefox WebRender

Publication date: 2026-09-29

Last updated on: 2026-09-29

Assigner: Mozilla Corporation

Description
Privilege escalation due to use-after-free in the Graphics: WebRender 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-2026-100797
EUVD
EUVD-2026-88950

Affected Vendors & Products

Showing 7 associated CPEs
Vendor Product Version / Range
mozilla firefox 153.4
mozilla firefox 157
mozilla firefox 115.42
mozilla firefox 140.17
mozilla firefox to 153.4 (inc)
mozilla firefox to 115.42 (inc)
mozilla firefox to 140.17 (inc)

Helpful Resources

Exploitability

CWE
CWE Icon
KEV
KEV Icon
CWE ID Description
CWE-416 The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

Attack-Flow Graph

AI Quick Actions

Instant insights powered by AI
Executive Summary

This is a privilege escalation vulnerability caused by a use-after-free error in the Graphics: WebRender component of Firefox. A use-after-free occurs when a program continues to use memory after it has been freed, potentially allowing attackers to execute arbitrary code or escalate privileges.

Impact Analysis

An attacker could exploit this to gain elevated privileges on your system, potentially allowing them to install malware, steal data, or take control of your device. It may also enable remote code execution if combined with other vulnerabilities.

Mitigation Strategies

Update Firefox to a patched version: Firefox ESR 153.4, Firefox 157, Firefox ESR 115.42, or Firefox ESR 140.17 or later. This vulnerability was fixed in these releases.

Chat Assistant

Ask questions about this CVE
Hi! I’m here to help you understand CVE-2026-100797. Ask me anything about the vulnerability, its impact, or mitigation strategies.
0/70

EPSS Chart