CVE-2025-14324

CRITICAL

Published Dec 9, 2025 Modified Apr 13, 2026 CWE-94

Description

JIT miscompilation in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 146, Firefox ESR 115.31, Firefox ESR 140.6, Thunderbird 146, and Thunderbird 140.6.

CVSS v3.1 Score

9.8

CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weakness Type (CWE)

CWE-94 CWE-94

Affected Products

Vendor	Product	Versions
mozilla	firefox	< 115.31.0
mozilla	firefox	< 146.0
mozilla	firefox	116.0 — 140.6.0
mozilla	thunderbird	< 140.6.0
mozilla	thunderbird	< 146.0

References

Advisories & Patches

https://www.mozilla.org/security/advisories/mfsa2025-92/ https://www.mozilla.org/security/advisories/mfsa2025-93/ https://www.mozilla.org/security/advisories/mfsa2025-94/ https://www.mozilla.org/security/advisories/mfsa2025-95/ https://www.mozilla.org/security/advisories/mfsa2025-96/

Other References

https://bugzilla.mozilla.org/show_bug.cgi?id=1996840

Frequently Asked Questions

What is CVE-2025-14324? +

JIT miscompilation in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 146, Firefox ESR 115.31, Firefox ESR 140.6, Thunderbird 146, and Thunderbird 140.6. It has a CVSS v3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2025-14324? +

CVE-2025-14324 has a CVSS v3.1 score of 9.8 out of 10, rated CRITICAL. This is a critical vulnerability that should be patched immediately.

What products are affected by CVE-2025-14324? +

CVE-2025-14324 affects products from mozilla, specifically: firefox, thunderbird. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-14324? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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