CVE-2026-4698
Modified Modified - Updated After Analysis
JIT Miscompilation in Firefox JavaScript Engine Causes Potential Exploits

Publication date: 2026-03-24

Last updated on: 2026-05-22

Assigner: Mozilla Corporation

Description
JIT miscompilation in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 149, Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.
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Meta Information
Published
2026-03-24
Last Modified
2026-05-22
Generated
2026-06-16
AI Q&A
2026-03-24
EPSS Evaluated
2026-06-15
NVD
CVE-2026-4698
EUVD
EUVD-2026-14813
Affected Vendors & Products
Showing 3 associated CPEs
Vendor Product Version / Range
mozilla firefox to 149.0 (exc)
mozilla firefox to 115.34.0 (exc)
mozilla firefox From 128.0 (inc) to 140.9.0 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-843 The product allocates or initializes a resource such as a pointer, object, or variable using one type, but it later accesses that resource using a type that is incompatible with the original type.
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Executive Summary

This vulnerability is a Just-In-Time (JIT) miscompilation issue in the JavaScript Engine's JIT component. It affects certain versions of Mozilla Firefox, specifically versions earlier than 149, and Firefox ESR versions earlier than 115.34 and 140.9.

Impact Analysis

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Detection Guidance

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