Race Condition in JavaScript Engine in Firefox Products by Mozilla
CVE-2026-74984

Currently unrated

Key Information:

Vendor: Mozilla
Status: Firefox
Vendor: CVE Published:; 18 August 2026

What is CVE-2026-74984?

A race condition vulnerability exists within the JavaScript Engine component of Firefox, which can potentially lead to unexpected behavior in the browser. This issue has been addressed in the latest updates, ensuring enhanced security for users of Firefox 154 and Firefox ESR 153.1.

Affected Version(s)

Firefox 153.1

Firefox 154

References

https://bugzilla.mozilla.org/show_bug.cgi?id=2053670

https://www.mozilla.org/security/advisories/mfsa2026-74/

https://www.mozilla.org/security/advisories/mfsa2026-77/

Download the Critical Vulnerability Management Cheat Sheet

Timeline

Vulnerability published
Aug 18, 2026
Vulnerability Reserved
Aug 17, 2026

Credit

Amy Burnett of OpenAI

CVE-2026-74984 Data

JSON