CVE-2026-109738: Use-after-free in the Audio/Video: Playback component

Published Oct 13, 2026
·
Updated

Use-after-free in the Audio/Video: Playback component. This vulnerability was fixed in Firefox 158 and Firefox ESR 153.5.

Other sources

Use-after-free in the Audio/Video: Playback component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.

— NVD

Affected Software

4 affected componentsFixes available
Mozilla Firefox<158
158
Mozilla Firefox ESR<153.5
153.5
Mozilla Thunderbird<153.5
153.5
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 to a fixed release to a version that resolves this vulnerability.

    Fixed in 153.5
  3. Upgrade

    Upgrade Firefox to a version that resolves this vulnerability.

    Fixed in 158
  4. Upgrade

    Upgrade Firefox ESR to a version that resolves this vulnerability.

    Fixed in 153.5
  5. Upgrade

    Upgrade Thunderbird to a version that resolves this vulnerability.

    Fixed in 158
  6. Upgrade

    Upgrade Thunderbird 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
Event
via NVD·03:42 PM

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 over the network without privileges, but user interaction is required. The CVSS vector indicates low attack complexity.

2

Which Firefox releases contain the fix?

Mozilla fixed the issue in Firefox 158 and Firefox ESR 153.5. Organizations should verify deployed browser versions and update to the applicable fixed release.

3

What is the expected security impact if exploitation succeeds?

The reported CVSS vector rates the issue as having low confidentiality impact and low integrity impact, with no availability impact. The scope is unchanged.

Company

Resources

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