CVE-2026-6778: Invalid pointer in the Audio/Video: Playback component

Published Apr 21, 2026
·
Updated

Invalid pointer in the Audio/Video: Playback component. This vulnerability was fixed in Firefox 150 and Thunderbird 150.

Affected Software

4 affected componentsFixes available
Mozilla Firefox<150
150
Mozilla Thunderbird<150
150
Mozilla Firefox<150.0
Mozilla Thunderbird<150.0

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 150
  2. Upgrade

    Upgrade Mozilla Firefox to a version that resolves this vulnerability.

    Fixed in 150
  3. Upgrade

    Upgrade Mozilla Thunderbird to a version that resolves this vulnerability.

    Fixed in 150

Event History

Apr 21, 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·12:41 PM
Data Sourced
via MITRE·12:41 PM
Description
Data Sourced
via NVD·01:16 PM
DescriptionSeverityWeaknessAffected Software
May 2, 58290
Event
via FIRST·08:53 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-2026-6778?

CVE-2026-6778 is classified as a high severity vulnerability due to its impact on the audio and video playback functionality.

2

How do I fix CVE-2026-6778?

To fix CVE-2026-6778, update Mozilla Firefox or Thunderbird to version 150 or later.

3

Which versions of Firefox are affected by CVE-2026-6778?

CVE-2026-6778 affects all versions of Firefox up to but not including version 150.

4

Which versions of Thunderbird are affected by CVE-2026-6778?

CVE-2026-6778 affects all versions of Thunderbird up to but not including version 150.

5

What type of vulnerability is CVE-2026-6778?

CVE-2026-6778 is an invalid pointer dereference vulnerability in the audio/video playback component.

Company

Resources

Contact

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