CVE-2026-109728: Use-after-free in the DOM: Animation component

Published Oct 13, 2026
·
Updated

Use-after-free in the DOM: Animation component. This vulnerability was fixed in Firefox 158, Firefox ESR 115.43, and Firefox ESR 153.5.

Affected Software

3 affected componentsFixes available
Mozilla Firefox<158
158
Mozilla Firefox ESR<115.43
115.43
Mozilla Firefox ESR<153.5
153.5

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

    Fixed in 115.43
  3. Upgrade

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

    Fixed in 153.5
  4. Upgrade

    Upgrade Firefox to a version that resolves this vulnerability.

    Fixed in 158
  5. Upgrade

    Upgrade Firefox ESR to a version that resolves this vulnerability.

    Fixed in 115.43
  6. Upgrade

    Upgrade Firefox ESR to a version that resolves this vulnerability.

    Fixed in 153.5

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
DescriptionSeverityWeakness

Parent advisories

This vulnerability appears in the following advisories.

Peer vulnerabilities

Found alongside the following vulnerabilities.

Frequently Asked Questions

1

What does an attacker need to exploit this issue?

The attacker can attempt exploitation remotely and does not need prior privileges, but user interaction is required. The CVSS vector indicates that successful exploitation can affect confidentiality and integrity, with no availability impact listed.

2

Which Firefox releases contain the fix?

Mozilla fixed the issue in Firefox 158, Firefox ESR 115.43, and Firefox ESR 153.5. Deployments should update to the applicable fixed release or a later release.

3

How can I determine whether a deployment needs remediation?

Check the installed Firefox or Firefox ESR version. Systems running a release earlier than the applicable listed fixed version should be updated.

Company

Resources

Contact

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