CVE-2026-118015: Use-after-free in the DOM: Core & HTML component

Published Oct 27, 2026
·
Updated

Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 159.

Affected Software

1 affected componentFixes available
Mozilla Firefox<159
159

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 159
  2. Upgrade

    Upgrade Firefox to a version that resolves this vulnerability.

    Fixed in 159

Event History

Oct 27, 2026
CVE Published
via Mozilla·12:00 AM
Data Sourced
via Mozilla·12:00 AM
DescriptionSeverityAffected Software
CVE Published
via MITRE·02:06 PM
Data Sourced
via MITRE·02:06 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 are affected?

The vulnerability was fixed in Firefox 159. The provided information does not identify the first affected version or any unaffected earlier release.

2

What does an attacker need to exploit this issue?

The provided information identifies the flaw as a use-after-free in Firefox's DOM Core and HTML component, but does not specify the attacker prerequisites, delivery method, or user interaction required.

3

How should organizations mitigate the issue?

Update Mozilla Firefox to version 159 or later. No temporary workaround or configuration-based mitigation is provided.

Company

Resources

Contact

SecAlerts Pty Ltd.
132 Wickham Terrace
Fortitude Valley,
QLD 4006, Australia
info@secalerts.co
By using SecAlerts services, you agree to our services end-user license agreement. This website is safeguarded by reCAPTCHA and governed by the Google Privacy Policy and Terms of Service. All names, logos, and brands of products are owned by their respective owners, and any usage of these names, logos, and brands for identification purposes only does not imply endorsement. If you possess any content that requires removal, please get in touch with us.
© 2026 SecAlerts Pty Ltd.
ABN: 70 645 966 203, ACN: 645 966 203