CVE-2026-2807: Memory safety bugs fixed in Firefox 148 and Thunderbird 148

Published Feb 24, 2026
·
Updated

Memory safety bugs present in Firefox 147 and Thunderbird 147. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code.

Affected Software

4 affected componentsFixes available
Mozilla Firefox<148
148
Mozilla Thunderbird<148
148
Mozilla Firefox<148.0
Mozilla Thunderbird<148.0

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 148
  2. Upgrade

    Upgrade Firefox to a version that resolves this vulnerability.

    Fixed in 148
  3. Upgrade

    Upgrade Thunderbird to a version that resolves this vulnerability.

    Fixed in 148

Event History

Feb 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·01:33 PM
Data Sourced
via MITRE·01:33 PM
Description
Data Sourced
via Red Hat·02:03 PM
DescriptionSeverityAffected Software
Data Sourced
via NVD·02:16 PM
DescriptionSeverityWeaknessAffected Software

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-2026-2807?

CVE-2026-2807 has a critical severity rating of 9.8 on the CVSS scale.

2

How do I fix CVE-2026-2807?

To fix CVE-2026-2807, update to Mozilla Firefox and Thunderbird version 148 or later.

3

What type of vulnerabilities are associated with CVE-2026-2807?

CVE-2026-2807 is associated with memory safety bugs that could potentially lead to memory corruption.

4

What software is affected by CVE-2026-2807?

CVE-2026-2807 affects Mozilla Firefox version 147 and Mozilla Thunderbird version 147.

5

What potential impact does CVE-2026-2807 have?

Exploitation of CVE-2026-2807 could allow an attacker to run arbitrary code on the affected systems.

Company

Resources

Contact

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