CVE-2026-74984
Undergoing Analysis Undergoing Analysis - In Progress

Race Condition in Firefox JavaScript Engine

Publication date: 2026-08-18

Last updated on: 2026-08-18

Assigner: Mozilla Corporation

Description
Race condition in the JavaScript Engine component. This vulnerability was fixed in Firefox 154 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-2026-74984
EUVD
EUVD-2026-60696

Affected Vendors & Products

Showing 2 associated CPEs
Vendor Product Version / Range
mozilla firefox to 154 (inc)
mozilla firefox_esr to 153.1 (inc)

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Exploitability

CWE
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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This is a race condition vulnerability in the JavaScript Engine component of Firefox. A race condition occurs when the behavior of software depends on the sequence or timing of uncontrollable events, potentially leading to unexpected or erroneous results.

Detection Guidance

Detection requires checking Firefox version. Run 'firefox --version' or check 'about:support' in Firefox. Versions before 154 or Firefox ESR before 153.1 are vulnerable.

Impact Analysis

A race condition in the JavaScript Engine could allow attackers to execute arbitrary code, crash the browser, or bypass security mechanisms. This may lead to data theft, system compromise, or unauthorized access depending on the user's environment.

Mitigation Strategies

Update Firefox to version 154 or later and Firefox ESR to 153.1 or later. Disable JavaScript if updates are not immediately possible.

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