CVE-2025-14330 — Improper Restriction of Operations within the Bounds of a Memory Buffer in Mozilla Firefox

CWE-119 — Improper Restriction of Operations within the Bounds of a Memory BufferCWE-686 — Function Call With Incorrect Argument TypeCWE-843 — Type Confusion12 documents9 sources
Severity
9.8CRITICALNVD
EPSS
0.1%
top 74.58%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
2
Mozilla ThunderbirdMozilla Firefox
Timeline
PublishedDec 9
Latest updateFeb 2

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 vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HExploitability: 3.9 | Impact: 5.9

Affected Packages3 packages

▶NVDmozilla/firefox< 140.6.0+1
▶NVDmozilla/thunderbird< 140.6.0+1
▶Debianmozilla/thunderbird< 1:140.6.0esr-1~deb11u1+3

🔴Vulnerability Details

3
CVEList
JIT miscompilation in the JavaScript Engine: JIT component↗2025-12-09
▶
GHSA
GHSA-r52p-x88m-mm4j: JIT miscompilation in the JavaScript Engine: JIT component↗2025-12-09
▶
OSV
CVE-2025-14330: JIT miscompilation in the JavaScript Engine: JIT component↗2025-12-09
▶

📋Vendor Advisories

7
Ubuntu
Thunderbird vulnerabilities↗2026-02-02
▶
Red Hat
firefox: thunderbird: JIT miscompilation in the JavaScript Engine: JIT component↗2025-12-09
▶
Debian
CVE-2025-14330: firefox - JIT miscompilation in the JavaScript Engine: JIT component. This vulnerability a...↗2025
▶
Mozilla
Mozilla Foundation Security Advisory 2025-94: CVE-2025-14330↗
▶
Mozilla
Mozilla Foundation Security Advisory 2025-92: CVE-2025-14330↗
▶

🕵️Threat Intelligence

1
Wiz
CVE-2025-14330 Impact, Exploitability, and Mitigation Steps | Wiz↗
▶
CVE-2025-14330 — Mozilla Firefox vulnerability | cvebase