CVE-2026-12299
Received Received - Intake
JIT Miscompilation in Firefox DOM Core

Publication date: 2026-06-16

Last updated on: 2026-06-16

Assigner: Mozilla Corporation

Description
JIT miscompilation in the DOM: Core & HTML component. 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-2026-12299
EUVD
EUVD-2026-37090
Affected Vendors & Products
Showing 3 associated CPEs
Vendor Product Version / Range
mozilla firefox 152
mozilla firefox_esr 140.12
mozilla firefox_esr 115.37
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-UNKNOWN
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Executive Summary

This vulnerability is a JIT (Just-In-Time) miscompilation issue in the DOM: Core & HTML component of Mozilla Firefox. It means that the JIT compiler, which is responsible for optimizing code execution, incorrectly compiles certain code related to the Document Object Model (DOM) and HTML processing.

The issue was addressed and fixed in Firefox versions 152, Firefox ESR 140.12, and Firefox ESR 115.37.

Mitigation Strategies

To mitigate this vulnerability, update Firefox to version 152 or later, or update Firefox ESR to version 140.12 or later, or ESR 115.37 or later.

Impact Analysis

This vulnerability involves a JIT miscompilation in the DOM: Core & HTML component of Mozilla Firefox. Such a flaw could potentially lead to incorrect execution of code within the browser, which might cause unexpected behavior, crashes, or security issues when rendering web content.

It was fixed in Firefox 152, Firefox ESR 140.12, and Firefox ESR 115.37, so using these or later versions mitigates the risk.

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