Name: CVE-2026-12326: Improper Restriction of Operations within the Bounds of a Memory Buffer
Creator: Rapid7
Published: 2026-06-16T00:00:00.000Z
License: https://www.rapid7.com/legal/website-terms-of-use/
Keywords: CVE, CVE-2026-12326, CWE-825, CWE-119, CVSS 8.1, EPSS 0.00251

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. This vulnerability was fixed in Firefox 152 and Thunderbird 152.

CVSS Details

CVSS 3.1 Base Score: 8.1
CVSS 3.1 Vector: (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H)

Covered by Rapid7

Product	Vendor Advisory	Solution File	Added	Published
Mfsa2026 57	—	Upgrade to the latest version of Mozilla FirefoxUpgrade to Mozilla Firefox version 152.0	Jun 16, 2026	Jun 16, 2026
Mozilla Thunderbird	—	Upgrade to Mozilla Thunderbird version 152.0Upgrade to the latest version of Mozilla Thunderbird	Jun 21, 2026	Jun 16, 2026

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CVSS Details

Covered by Rapid7

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