CVE-2026-118020: Use-after-free in the Layout component

Published Oct 27, 2026
·
Updated

Use-after-free in the Layout 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 issue was fixed in Firefox 159. The provided information does not identify the first affected version or whether any Firefox variants are affected.

2

What should organizations do to remediate this issue?

Update Mozilla Firefox to version 159 or later. No workaround or compensating control is provided in the available information.

3

What does an attacker need to exploit this vulnerability?

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

Company

Resources

Contact

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