CVE-2026-12300

Modified Modified - Updated After Analysis

Memory Corruption Bug Fixed in Firefox 152

Publication date: 2026-06-16

Last updated on: 2026-06-18

Assigner: Mozilla Corporation

Description

Memory safety bug fixed in Firefox 152. This vulnerability was fixed in Firefox 152 and Thunderbird 152.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-06-16

Last Modified

2026-06-18

Generated

2026-07-06

AI Q&A

2026-06-16

EPSS Evaluated

2026-07-05

NVD

CVE-2026-12300

EUVD

EUVD-2026-37091

Affected Vendors & Products

Vendor	Product	Version / Range
mozilla	firefox	152

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-119	The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.

Attack-Flow Graph

Executive Summary

This vulnerability is a memory safety bug that was present in Firefox before version 152. It relates to improper handling of memory which could potentially lead to unexpected behavior or security issues. The bug was fixed in Firefox 152.

Mitigation Strategies

The vulnerability is fixed in Firefox 152. To mitigate this vulnerability, you should update your Firefox browser to version 152 or later.

Impact Analysis

Memory safety bugs can lead to various security risks such as crashes, data corruption, or exploitation by attackers to execute arbitrary code. If unpatched, this vulnerability could potentially allow attackers to compromise the security of Firefox users.

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