CVE-2025-14330

CRITICAL

Published Dec 9, 2025 Modified Apr 13, 2026 CWE-119 CWE-686 CWE-843

Description

JIT miscompilation in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 146, 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-119 Buffer Overflow

CWE-686 CWE-686

CWE-843 CWE-843

Affected Products

Vendor	Product	Versions
mozilla	firefox	< 140.6.0
mozilla	firefox	< 146.0
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/mfsa2025-94/ 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=1997503

Frequently Asked Questions

What is CVE-2025-14330? +

JIT miscompilation in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 146, 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-2025-14330? +

CVE-2025-14330 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-2025-14330? +

CVE-2025-14330 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-2025-14330? +

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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