CVE-2026-100793

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JIT Miscompilation in Firefox JavaScript Engine

Publication date: 2026-09-29

Last updated on: 2026-10-01

Assigner: Mozilla Corporation

Description

JIT miscompilation in the JavaScript Engine component. This vulnerability was fixed in Thunderbird 157 and Firefox 157.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-09-29

Last Modified

2026-10-01

Generated

2026-10-19

AI Q&A

2026-09-29

EPSS Evaluated

2026-10-18

NVD

CVE-2026-100793

EUVD

EUVD-2026-88945

Affected Vendors & Products

Vendor	Product	Version / Range
mozilla	firefox	157

Helpful Resources

Exploitability

CWE

KEV

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.

Attack-Flow Graph

Executive Summary

This is a JIT miscompilation vulnerability in Firefox's JavaScript Engine. Just-In-Time compilation errors could lead to incorrect code execution, potentially causing crashes or unexpected behavior in the browser.

Detection Guidance

This vulnerability is specific to the Firefox JavaScript Engine and requires detection through Firefox version checks. No direct network or system detection commands are provided in the CVE details. Check if your Firefox version is below 157 using the application's about page or update mechanism.

Impact Analysis

An attacker could exploit this to execute arbitrary code, crash the browser, or bypass security mechanisms. Users running vulnerable Firefox versions may face stability issues or security risks.

Compliance Impact

The provided CVE data does not specify any direct impact on compliance with standards like GDPR or HIPAA. The vulnerability involves a JIT miscompilation in Firefox's JavaScript Engine, which could potentially lead to code execution issues but lacks details on regulatory implications.

Mitigation Strategies

Update Firefox to version 157 or later to address the JIT miscompilation vulnerability in the JavaScript Engine component.

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