CVE-2026-100825
Received Received - Intake

Use-after-free in Firefox JavaScript Engine JIT

Publication date: 2026-09-29

Last updated on: 2026-09-29

Assigner: Mozilla Corporation

Description
Use-after-free in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox ESR 153.4 and Firefox 157.

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-2026-100825
EUVD
EUVD-2026-88804

Affected Vendors & Products

Showing 2 associated CPEs
Vendor Product Version / Range
mozilla firefox to 153.4 (inc)
mozilla firefox to 157 (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 Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.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 use-after-free vulnerability in the JavaScript Engine's JIT component. Use-after-free means the software tries to use memory after it has been freed, which can lead to crashes or arbitrary code execution. It was fixed in Firefox ESR 153.4 and Firefox 157.

Impact Analysis

An attacker could exploit this to crash your browser or run malicious code on your device. This could allow them to steal data, install malware, or take control of your system if you visit a specially crafted website.

Compliance Impact

This vulnerability is a use-after-free in the JavaScript Engine JIT component, which could allow arbitrary code execution. Such vulnerabilities may lead to unauthorized data access or modification, potentially violating GDPR data integrity and confidentiality requirements or HIPAA safeguards for protected health information.

Mitigation Strategies

Update Firefox to version ESR 153.4 or Firefox 157 or later to address the use-after-free vulnerability in the JavaScript Engine JIT component.

Chat Assistant

Ask questions about this CVE
Hi! I’m here to help you understand CVE-2026-100825. Ask me anything about the vulnerability, its impact, or mitigation strategies.
0/70

EPSS Chart