CVE-2026-12326: Memory safety bugs fixed in Firefox 152 and Thunderbird 152

Published Jun 16, 2026
·
Updated

Memory safety bugs present in Firefox 151 and Thunderbird 151. 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<152
152
Mozilla Thunderbird<152
152
Mozilla Firefox<152.0.0
Mozilla Thunderbird<152.0.0

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 152
  2. Upgrade

    Upgrade Firefox to a version that resolves this vulnerability.

    Fixed in 152
  3. Upgrade

    Upgrade Thunderbird to a version that resolves this vulnerability.

    Fixed in 152

Event History

Jun 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·11:52 AM
Data Sourced
via MITRE·11:52 AM
Description
Data Sourced
via NVD·01:16 PM
DescriptionSeverityWeaknessAffected Software
Data Sourced
via Red Hat·02:02 PM
DescriptionSeverityAffected 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-2026-12326?

The severity of CVE-2026-12326 is high, with a CVSS score of 8.1.

2

How do I fix CVE-2026-12326?

To fix CVE-2026-12326, upgrade to Firefox 152 or Thunderbird 152 or later.

3

What types of vulnerabilities are associated with CVE-2026-12326?

CVE-2026-12326 is associated with memory safety bugs, specifically memory corruption issues.

4

Can CVE-2026-12326 be exploited remotely?

Yes, CVE-2026-12326 can potentially be exploited remotely due to memory safety issues.

5

Which software products are affected by CVE-2026-12326?

CVE-2026-12326 affects Mozilla Firefox 151 and Mozilla Thunderbird 151.

Company

Resources

Contact

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