CVE-2026-2447: Heap buffer overflow in libvpx

Published Feb 16, 2026
·
Updated

Heap buffer overflow in libvpx. This vulnerability affects Firefox < 147.0.4, Firefox ESR < 140.7.1, and Firefox ESR < 115.32.1.

Other sources

Heap buffer overflow in libvpx. This vulnerability was fixed in Firefox 147.0.4, Firefox ESR 140.7.1, Firefox ESR 115.32.1, Thunderbird 140.7.2, and Thunderbird 147.0.2.

— MITRE

Affected Software

10 affected componentsFixes available
Mozilla Firefox<147.0.4
147.0.4
Mozilla Firefox ESR<115.32.1
115.32.1
Mozilla Firefox ESR<140.7.1
140.7.1
Mozilla Thunderbird<140.7.2
140.7.2
Mozilla Thunderbird<147.0.2
147.0.2
Mozilla Firefox<115.32.1
Mozilla Firefox<147.0.4
Mozilla Firefox>=116.0<140.7.1
Mozilla Thunderbird<140.7.2
Mozilla Thunderbird>=141.0<147.0.2

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 147.0.4
  2. Upgrade

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

    Fixed in 115.32.1
  3. Upgrade

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

    Fixed in 140.7.1
  4. Upgrade

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

    Fixed in 140.7.2
  5. Upgrade

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

    Fixed in 147.0.2
  6. Upgrade

    Upgrade Firefox to a version that resolves this vulnerability.

    Fixed in 147.0.4
  7. Upgrade

    Upgrade Firefox ESR to a version that resolves this vulnerability.

    Fixed in 140.7.1
  8. Upgrade

    Upgrade Firefox ESR to a version that resolves this vulnerability.

    Fixed in 115.32.1
  9. Upgrade

    Upgrade Thunderbird to a version that resolves this vulnerability.

    Fixed in 140.7.2
  10. Upgrade

    Upgrade Thunderbird to a version that resolves this vulnerability.

    Fixed in 147.0.2

Event History

Feb 16, 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·02:13 PM
Data Sourced
via MITRE·02:13 PM
Description
Data Sourced
via Red Hat·03:01 PM
DescriptionSeverityAffected Software
Data Sourced
via NVD·03:18 PM
DescriptionSeverityWeaknessAffected Software

Parent advisories

This vulnerability appears in the following advisories.

Peer vulnerabilities

Found alongside the following vulnerabilities.

Frequently Asked Questions

1

What is the severity of CVE-2026-2447?

CVE-2026-2447 has a high severity due to the potential for heap buffer overflow leading to denial of service or code execution.

2

How do I fix CVE-2026-2447?

To fix CVE-2026-2447, update to Firefox version 147.0.4 or the appropriate Firefox ESR versions 140.7.1 or 115.32.1.

3

Which versions of Firefox are affected by CVE-2026-2447?

CVE-2026-2447 affects Firefox versions prior to 147.0.4 and Firefox ESR versions prior to 140.7.1 and 115.32.1.

4

What causes the vulnerability identified as CVE-2026-2447?

CVE-2026-2447 is caused by a heap buffer overflow in the libvpx library utilized by affected versions of Firefox.

5

Is there a known exploit for CVE-2026-2447?

As of now, there are no publicly verified exploits for CVE-2026-2447, but the vulnerability's high severity warrants immediate action.

Company

Resources

Contact

SecAlerts Pty Ltd.
132 Wickham Terrace
Fortitude Valley,
QLD 4006, Australia
info@secalerts.co
By using SecAlerts services, you agree to our services end-user license agreement. This website is safeguarded by reCAPTCHA and governed by the Google Privacy Policy and Terms of Service. All names, logos, and brands of products are owned by their respective owners, and any usage of these names, logos, and brands for identification purposes only does not imply endorsement. If you possess any content that requires removal, please get in touch with us.
© 2026 SecAlerts Pty Ltd.
ABN: 70 645 966 203, ACN: 645 966 203