CVE-2026-6764: Incorrect boundary conditions in the DOM: Device Interfaces component

Published Apr 21, 2026
·
Updated

Incorrect boundary conditions in the DOM: Device Interfaces component. This vulnerability was fixed in Firefox 150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.

Affected Software

7 affected componentsFixes available
Mozilla Firefox ESR<140.10
140.10
Mozilla Firefox<150
150
Mozilla Thunderbird<150
150
Mozilla Thunderbird<140.10
140.10
Mozilla Firefox<140.10.0
Mozilla Firefox<150.0
Mozilla Thunderbird>=140.0<140.10.0

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 140.10
  2. Upgrade

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

    Fixed in 150
  3. Upgrade

    Upgrade Mozilla Firefox to a version that resolves this vulnerability.

    Fixed in 150
  4. Upgrade

    Upgrade Mozilla Firefox ESR to a version that resolves this vulnerability.

    Fixed in 140.10
  5. Upgrade

    Upgrade Mozilla Thunderbird to a version that resolves this vulnerability.

    Fixed in 150
  6. Upgrade

    Upgrade Mozilla Thunderbird to a version that resolves this vulnerability.

    Fixed in 140.10

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·12:40 PM
Data Sourced
via MITRE·12:40 PM
Description
Data Sourced
via NVD·01:16 PM
DescriptionSeverityWeaknessAffected Software
Data Sourced
via Red Hat·02:03 PM
DescriptionSeverityAffected Software
May 2, 58290
Event
via FIRST·04:31 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-2026-6764?

CVE-2026-6764 has a severity rating that may vary based on the specific exploitability and system context.

2

How do I fix CVE-2026-6764?

To fix CVE-2026-6764, update to Firefox version 150, Firefox ESR 140.10, Thunderbird version 150, or Thunderbird ESR 140.10.

3

What software is affected by CVE-2026-6764?

CVE-2026-6764 affects Mozilla Firefox, Firefox ESR, and Thunderbird versions prior to 150 for Firefox and Thunderbird, and prior to 140.10 for Firefox ESR and Thunderbird ESR.

4

Is there a workaround for CVE-2026-6764?

There are no official workarounds for CVE-2026-6764, and the recommended action is to apply the updates.

5

When was CVE-2026-6764 disclosed?

CVE-2026-6764 was disclosed alongside its patches in Mozilla's security advisories.

Company

Resources

Contact

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