CVE-2026-74936
Undergoing Analysis Undergoing Analysis - In Progress

Use-after-free in Firefox JavaScript WebAssembly

Publication date: 2026-08-18

Last updated on: 2026-08-18

Assigner: Mozilla Corporation

Description
Use-after-free in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox 154, Firefox ESR 140.14, and Firefox ESR 153.1.

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Meta Information

Published
2026-08-18
Last Modified
2026-08-18
Generated
2026-08-18
AI Q&A
2026-08-18
EPSS Evaluated
N/A
NVD
CVE-2026-74936
EUVD
EUVD-2026-60745

Affected Vendors & Products

Showing 3 associated CPEs
Vendor Product Version / Range
mozilla firefox to 154 (inc)
mozilla firefox_esr to 140.14 (inc)
mozilla firefox_esr to 153.1 (inc)

Helpful Resources

Exploitability

CWE
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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 browsers. It occurs when a program continues to use memory after it has been freed, potentially leading to crashes or arbitrary code execution.

Detection Guidance

This vulnerability is specific to Firefox browsers and was patched in Firefox 154, Firefox ESR 140.14, and Firefox ESR 153.1. To detect it, check your Firefox version using commands like 'firefox --version' or 'about:support' in the browser. If your version is below these thresholds, the system is vulnerable.

Impact Analysis

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

Mitigation Strategies

Update Firefox to version 154 or later, Firefox ESR to version 140.14 or later, or Firefox ESR to version 153.1 or later to address the use-after-free vulnerability in the JavaScript: WebAssembly component.

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