CVE-2026-109774: Invalid pointer, undefined behavior in the DOM: Notifications component

Published Oct 13, 2026
·
Updated

Invalid pointer, undefined behavior in the DOM: Notifications component. This vulnerability was fixed in Firefox 158 and Thunderbird 158.

Affected Software

2 affected componentsFixes available
Mozilla Firefox<158
158
Mozilla Thunderbird<158
158

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 158
  2. Upgrade

    Upgrade Firefox to a version that resolves this vulnerability.

    Fixed in 158
  3. Upgrade

    Upgrade Thunderbird to a version that resolves this vulnerability.

    Fixed in 158

Event History

Oct 13, 2026
CVE Published
via Mozilla·12:00 AM
Data Sourced
via Mozilla·12:00 AM
DescriptionSeverityAffected Software
CVE Published
via MITRE·12:29 PM
Data Sourced
via MITRE·12:29 PM
Description
Data Sourced
via NVD·01:17 PM
Description

Parent advisories

This vulnerability appears in the following advisories.

Peer vulnerabilities

Found alongside the following vulnerabilities.

Frequently Asked Questions

1

Which Firefox versions need remediation?

The issue was fixed in Firefox 158. The provided data does not identify the first affected version or whether any extended-support releases are affected.

2

What component is involved?

The vulnerability is in Firefox's DOM Notifications component. The provided data does not state which notification actions or web content conditions trigger the invalid pointer behavior.

3

What should teams do if they cannot immediately update?

The provided data does not include a workaround or mitigation. Updating to Firefox 158 is the documented remediation.

Company

Resources

Contact

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