CVE-2026-4697: Incorrect boundary conditions in the Audio/Video: Web Codecs component

Published Mar 24, 2026
·
Updated

Incorrect boundary conditions in the Audio/Video: Web Codecs component. This vulnerability affects Firefox < 149 and Firefox ESR < 140.9.

Other sources

Incorrect boundary conditions in the Audio/Video: Web Codecs component. This vulnerability was fixed in Firefox 149, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.

— MITRE

Affected Software

8 affected componentsFixes available
Mozilla Firefox<149
Mozilla Firefox ESR<140.9
Mozilla Firefox<149
149
Mozilla Firefox ESR<140.9
140.9
Mozilla Firefox<140.9.0
Mozilla Firefox<149.0
Mozilla Thunderbird<140.9
140.9
Mozilla Thunderbird<149
149

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 Red Hat·01:02 PM
DescriptionSeverityAffected Software
Data Sourced
via NVD·01:16 PM
DescriptionSeverityWeaknessAffected Software
Apr 7, 58249
Event
via FIRST·08:08 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-2026-4697?

CVE-2026-4697 is considered a moderate severity vulnerability due to incorrect boundary conditions in the Audio/Video: Web Codecs component.

2

How do I fix CVE-2026-4697?

To fix CVE-2026-4697, upgrade to Mozilla Firefox version 149, Firefox ESR version 140.9, or Thunderbird version 149.

3

Which versions are affected by CVE-2026-4697?

CVE-2026-4697 affects Firefox versions below 149, Firefox ESR versions below 140.9, and Thunderbird versions below 149.

4

What components are involved in CVE-2026-4697?

CVE-2026-4697 involves incorrect boundary conditions specifically in the Audio/Video: Web Codecs component.

5

Is there a specific vendor associated with CVE-2026-4697?

Yes, the vendor associated with CVE-2026-4697 is Mozilla.

Company

Resources

Contact

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