JIT Miscompilation in Firefox Affects Mozilla Products
CVE-2025-14324

9.8CRITICAL

Key Information:

Vendor

Mozilla
Status
Firefox
Firefox Esr
Thunderbird
Vendor
CVE Published:
9 December 2025

What is CVE-2025-14324?

A JIT miscompilation vulnerability identified in the JavaScript Engine of Firefox may lead to undefined behavior. This flaw impacts various versions of Firefox, including the standard version prior to 146 and the Extended Support Release versions below 115.31 and 140.6. Users are advised to update their browsers to mitigate potential risks associated with this vulnerability, as it can interfere with the execution of JavaScript, posing security concerns that need to be addressed.

Affected Version(s)

Firefox < 146

Firefox ESR < 115.31

Firefox ESR < 140.6

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1996840
https://www.mozilla.org/security/advisories/mfsa2025-92/
https://www.mozilla.org/security/advisories/mfsa2025-93/

CVSS V3.1

Score:
9.8
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Lingming Zhang
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CVE-2025-14324 : JIT Miscompilation in Firefox Affects Mozilla Products