CVE-2026-2785: Invalid pointer in the JavaScript Engine component

Published Feb 24, 2026
·
Updated

Invalid pointer in the JavaScript Engine component. This vulnerability affects Firefox < 148 and Firefox ESR < 140.8.

Other sources

Invalid pointer in the JavaScript Engine component. This vulnerability was fixed in Firefox 148, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8.

— MITRE

Affected Software

8 affected componentsFixes available
Mozilla Firefox<148
148
Mozilla Firefox ESR<140.8
140.8
Mozilla Thunderbird<148
148
Mozilla Thunderbird<140.8
140.8
Mozilla Firefox<140.8.0
Mozilla Firefox<148.0
Mozilla Thunderbird<140.8.0
Mozilla Thunderbird<148.0

Event History

Feb 24, 2026
CVE Published
via Mozilla·12:00 AM
Data Sourced
via Mozilla·12:00 AM
DescriptionSeverityAffected Software
Updated
via Mozilla·12:00 AM
Affected Software
CVE Published
via MITRE·01:33 PM
Data Sourced
via MITRE·01:33 PM
Description
Data Sourced
via Red Hat·02:02 PM
DescriptionSeverityAffected Software
Data Sourced
via NVD·02:16 PM
DescriptionSeverityWeaknessAffected Software
Jan 4, 58137
Event
via FIRST·01:11 PM

Parent advisories

This vulnerability appears in the following advisories.

Peer vulnerabilities

Found alongside the following vulnerabilities.

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Frequently Asked Questions

1

What is the severity of CVE-2026-2785?

CVE-2026-2785 has a high severity rating due to the potential for arbitrary code execution resulting from an invalid pointer in the JavaScript Engine.

2

How do I fix CVE-2026-2785?

To fix CVE-2026-2785, upgrade to Mozilla Firefox version 148 or Firefox ESR version 140.8 or later.

3

Which versions of Firefox are affected by CVE-2026-2785?

CVE-2026-2785 affects all Firefox versions prior to 148 and Firefox ESR versions prior to 140.8.

4

What can happen if CVE-2026-2785 is exploited?

If exploited, CVE-2026-2785 could allow an attacker to execute arbitrary code on the user's system.

5

Is there a patch available for CVE-2026-2785?

Yes, Mozilla has released patches for CVE-2026-2785 in Firefox version 148 and Firefox ESR version 140.8.

Company

Resources

Contact

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