CVE-2025-14330: JIT miscompilation in the JavaScript Engine: JIT component

Published Dec 9, 2025
·
Updated

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.

Other sources

JIT miscompilation in the JavaScript Engine: JIT component. This vulnerability affects Firefox < 146 and Firefox ESR < 140.6.

— Red Hat

Affected Software

23 affected componentsFixes available
Mozilla Firefox<146
Mozilla Firefox ESR<140.6
Mozilla Thunderbird<146
146
Mozilla Firefox<140.6.0
Mozilla Firefox<146.0
Mozilla Thunderbird<140.6.0
Mozilla Thunderbird<146.0
ubuntu/mozjs52*
ubuntu/mozjs38*
ubuntu/mozjs68*
ubuntu/mozjs52*
ubuntu/mozjs102*
ubuntu/mozjs78*
ubuntu/mozjs91*
ubuntu/thunderbird<1:140.7.1+build1-0ubuntu0.22.04.1
1:140.7.1+build1-0ubuntu0.22.04.1
ubuntu/mozjs102*
ubuntu/mozjs115*
Mozilla Firefox<146
146
Mozilla Firefox ESR<140.6
140.6
Mozilla Thunderbird<140.6
140.6
debian/firefox
159.0-1
debian/firefox-esr
140.12.0esr-1~deb12u1153.6.0esr-1~deb12u2140.15.0esr-1~deb13u1153.6.0esr-1~deb13u1153.5.1esr-1153.6.0esr-1
debian/thunderbird
1:140.12.0esr-1~deb12u11:153.6.0esr-1~deb12u21:140.12.0esr-1~deb13u11:153.6.0esr-1~deb13u11:153.5.0esr-11:153.6.0esr-1

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 146
  2. Upgrade

    Upgrade ubuntu/thunderbird to a version that resolves this vulnerability.

    Fixed in 1:140.7.1+build1-0ubuntu0.22.04.1
  3. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 140.6
  4. Upgrade

    Upgrade debian/firefox to a version that resolves this vulnerability.

    Fixed in 159.0-1
  5. Upgrade

    Upgrade debian/firefox-esr to a version that resolves this vulnerability.

    Fixed in 140.12.0esr-1~deb12u1Fixed in 153.6.0esr-1~deb12u2Fixed in 140.15.0esr-1~deb13u1Fixed in 153.6.0esr-1~deb13u1Fixed in 153.5.1esr-1Fixed in 153.6.0esr-1
  6. Upgrade

    Upgrade debian/thunderbird to a version that resolves this vulnerability.

    Fixed in 1:140.12.0esr-1~deb12u1Fixed in 1:153.6.0esr-1~deb12u2Fixed in 1:140.12.0esr-1~deb13u1Fixed in 1:153.6.0esr-1~deb13u1Fixed in 1:153.5.0esr-1Fixed in 1:153.6.0esr-1
  7. Upgrade

    Upgrade Firefox and Thunderbird to a version that resolves this vulnerability.

    Fixed in 146
  8. Upgrade

    Upgrade Firefox ESR and Thunderbird to a version that resolves this vulnerability.

    Fixed in 140.6

Event History

Dec 9, 2025
CVE Published
via Mozilla·12:00 AM
Data Sourced
via Mozilla·12:00 AM
DescriptionSeverityAffected Software
Data Sourced
via Ubuntu·12:00 AM
RemedyDescriptionSeverityAffected Software
CVE Published
via MITRE·01:38 PM
Data Sourced
via MITRE·01:38 PM
Description
Data Sourced
via Red Hat·02:02 PM
DescriptionSeverityAffected Software
Data Sourced
via OSV·04:17 PM
DescriptionSeverityAffected Software
Data Sourced
via NVD·04:17 PM
DescriptionSeverityWeaknessAffected Software

Parent advisories

This vulnerability appears in the following advisories.

Peer vulnerabilities

Found alongside the following vulnerabilities.

Frequently Asked Questions

1

What is the severity of CVE-2025-14330?

CVE-2025-14330 is considered a high-severity vulnerability due to its potential for exploitation in affected versions of Firefox.

2

How do I fix CVE-2025-14330?

To fix CVE-2025-14330, update to Firefox version 146 or later, or Firefox ESR version 140.6 or later.

3

What versions are affected by CVE-2025-14330?

CVE-2025-14330 affects Firefox versions prior to 146 and Firefox ESR versions prior to 140.6.

4

What type of vulnerability is CVE-2025-14330?

CVE-2025-14330 is a Just-In-Time (JIT) miscompilation vulnerability in the JavaScript engine of Firefox.

5

Has CVE-2025-14330 been publicly disclosed?

Yes, CVE-2025-14330 has been publicly disclosed through Mozilla's security advisories.

Company

Resources

Contact

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