CVE-2026-16411: Memory safety bugs fixed in Thunderbird 153

Published Jul 21, 2026
·
Updated

Memory safety bugs present in Firefox 152. 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.

Other sources

Memory safety bugs present in Thunderbird 152. 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.

— Mozilla

Affected Software

4 affected componentsFixes available
Mozilla Firefox<153
Mozilla Firefox<153
153
Mozilla Firefox<153.0.0
Mozilla Thunderbird<153
153

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 153
  2. Upgrade

    Upgrade Firefox to a version that resolves this vulnerability.

    Fixed in 153
  3. Upgrade

    Upgrade Thunderbird to a version that resolves this vulnerability.

    Fixed in 153

Event History

Jul 21, 2026
CVE Published
via Mozilla·12:00 AM
Data Sourced
via Mozilla·12:00 AM
DescriptionSeverityAffected Software
Updated
via Mozilla·12:00 AM
DescriptionAffected Software
CVE Published
via MITRE·12:38 PM
Data Sourced
via MITRE·12:38 PM
Description
Data Sourced
via NVD·01:17 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-2026-16411?

CVE-2026-16411 has a critical severity score of 9.8.

2

How do I fix CVE-2026-16411?

To address CVE-2026-16411, update to Mozilla Thunderbird version 153 or later.

3

What type of vulnerability is CVE-2026-16411?

CVE-2026-16411 is categorized as a memory safety bug leading to potential memory corruption.

4

Can CVE-2026-16411 allow remote code execution?

Yes, CVE-2026-16411 may allow attackers to execute arbitrary code with sufficient effort.

5

Which software products are affected by CVE-2026-16411?

CVE-2026-16411 affects Mozilla Firefox version 152 and earlier, as well as Mozilla Thunderbird.

Company

Resources

Contact

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