CVE-2026-74984
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Race Condition in Firefox JavaScript Engine

Publication date: 2026-08-18

Last updated on: 2026-08-25

Assigner: Mozilla Corporation

Description
Race condition in the JavaScript Engine component. This vulnerability was fixed in Firefox 154, Firefox ESR 153.1, Thunderbird 154, and Thunderbird 153.1.

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Meta Information

Published
2026-08-18
Last Modified
2026-08-25
Generated
2026-09-07
AI Q&A
2026-08-18
EPSS Evaluated
2026-09-06
NVD
CVE-2026-74984
EUVD
EUVD-2026-60696

Affected Vendors & Products

Showing 2 associated CPEs
Vendor Product Version / Range
mozilla firefox to 153.1.0 (exc)
mozilla thunderbird to 153.1.0 (exc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-362 The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.

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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.

Compliance Impact

The provided CVE data does not specify how this vulnerability impacts compliance with standards like GDPR or HIPAA. Without additional context on data exposure or processing implications, its effect on compliance cannot be determined.

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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