CVE-2026-100776
Received Received - Intake

Use-after-free in Firefox JavaScript WebAssembly

Publication date: 2026-09-29

Last updated on: 2026-09-29

Assigner: Mozilla Corporation

Description
Use-after-free in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox ESR 153.4, Firefox 157, and Firefox ESR 140.17.

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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-2026-100776
EUVD
EUVD-2026-88928

Affected Vendors & Products

Showing 3 associated CPEs
Vendor Product Version / Range
mozilla firefox 153.4
mozilla firefox 157
mozilla firefox 140.17

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This is a use-after-free vulnerability in the JavaScript WebAssembly component of Firefox. Use-after-free occurs when a program continues to use memory after it has been freed, potentially leading to crashes or arbitrary code execution.

Impact Analysis

An attacker could exploit this to execute arbitrary code on your system, crash your browser, or gain control over your computer. It requires user interaction, such as visiting a malicious website.

Mitigation Strategies

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

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