CVE-2026-12328
Received Received - Intake
Memory Corruption in Firefox and Thunderbird

Publication date: 2026-06-16

Last updated on: 2026-06-16

Assigner: Mozilla Corporation

Description
Memory safety bugs present in Firefox ESR 115.36, Firefox ESR 140.11, Thunderbird ESR 140.11, 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. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, and Firefox ESR 115.37.
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Meta Information
Published
2026-06-16
Last Modified
2026-06-16
Generated
2026-06-16
AI Q&A
2026-06-16
EPSS Evaluated
N/A
NVD
CVE-2026-12328
EUVD
EUVD-2026-37074
Affected Vendors & Products
Showing 8 associated CPEs
Vendor Product Version / Range
mozilla firefox 115.36
mozilla firefox 140.11
mozilla thunderbird 140.11
mozilla firefox 151
mozilla thunderbird 151
mozilla firefox 152
mozilla firefox_esr 140.12
mozilla firefox_esr 115.37
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Exploitability
CWE
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KEV
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CWE ID Description
CWE-UNKNOWN
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Executive Summary

This vulnerability involves memory safety bugs found in specific versions of Firefox ESR, Firefox, and Thunderbird. These bugs show evidence of memory corruption, which means that an attacker could potentially exploit them to execute arbitrary code on the affected systems.

The affected versions include Firefox ESR 115.36, Firefox ESR 140.11, Thunderbird ESR 140.11, Firefox 151, and Thunderbird 151. The issue was fixed in Firefox 152, Firefox ESR 140.12, and Firefox ESR 115.37.

Impact Analysis

This vulnerability can lead to memory corruption, which an attacker could exploit to run arbitrary code on your system. This means an attacker might be able to execute malicious actions, potentially compromising your system's security.

Exploitation could allow attackers to gain elevated privileges within the application, leading to unauthorized system access or further exploitation.

Mitigation Strategies

To mitigate this vulnerability, you should update affected Mozilla products to the fixed versions.

  • Update Firefox ESR to version 115.37 or later.
  • Update Firefox ESR to version 140.12 or later.
  • Update Firefox to version 152 or later.
  • Update Thunderbird ESR to version 140.12 or later.
  • Update Thunderbird to version 152 or later.
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