CVE-2026-4724: Undefined behavior in the Audio/Video component

Published Mar 24, 2026
·
Updated

Undefined behavior in the Audio/Video component. This vulnerability was fixed in Firefox 149 and Thunderbird 149.

Affected Software

5 affected componentsFixes available
Mozilla Firefox<149
Mozilla Firefox<149
149
Mozilla Thunderbird<149
149
Mozilla Firefox<149.0
Mozilla Thunderbird<149.0

Event History

Mar 24, 2026
CVE Published
via Mozilla·12:00 AM
Data Sourced
via Mozilla·12:00 AM
DescriptionSeverityAffected Software
Updated
via Mozilla·12:00 AM
Affected Software
CVE Published
via MITRE·12:30 PM
Data Sourced
via MITRE·12:30 PM
Description
Data Sourced
via NVD·01:16 PM
DescriptionSeverityWeaknessAffected Software
Apr 7, 58249
Event
via FIRST·08:09 AM

Parent advisories

This vulnerability appears in the following advisories.

Peer vulnerabilities

Found alongside the following vulnerabilities.

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Frequently Asked Questions

1

What is the severity of CVE-2026-4724?

CVE-2026-4724 is categorized as a critical vulnerability due to its potential to cause undefined behavior in the Audio/Video component.

2

How do I fix CVE-2026-4724?

To fix CVE-2026-4724, upgrade to Firefox version 149 or later.

3

What systems are affected by CVE-2026-4724?

CVE-2026-4724 affects all versions of Mozilla Firefox prior to version 149.

4

Can CVE-2026-4724 lead to exploitation?

Yes, CVE-2026-4724 can lead to exploitation, potentially allowing attackers to execute arbitrary code.

5

Is there a patch for CVE-2026-4724?

Yes, Mozilla has released a patch for CVE-2026-4724 in version 149 of Firefox.

Company

Resources

Contact

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CVE-2026-4724 - Undefined behavior in the Audio/Video component - SecAlerts