CVE-2026-100792

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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: WebAssembly component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, and Firefox ESR 140.17.

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-2026-100792

EUVD

EUVD-2026-88944

Affected Vendors & Products

Vendor	Product	Version / Range
mozilla	firefox	to 153.4 (inc)
mozilla	firefox	157
mozilla	firefox	to 140.17 (inc)
mozilla	firefox	153.4
mozilla	firefox	140.17

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 vulnerability is a JIT miscompilation issue in the JavaScript: WebAssembly component of Firefox. It could lead to incorrect code execution, potentially causing crashes or unexpected behavior in affected versions.

Detection Guidance

This vulnerability is specific to Firefox's JavaScript: WebAssembly component and requires checking the installed version of Firefox. Detect it by running commands like 'firefox --version' or checking your package manager (e.g., 'apt list --installed | grep firefox' for Debian/Ubuntu). If the version is below Firefox ESR 153.4, Firefox 157, or Firefox ESR 140.17, the system is vulnerable.

Impact Analysis

If exploited, this vulnerability could allow attackers to execute arbitrary code, crash the browser, or bypass security mechanisms. Users of vulnerable Firefox versions are at risk until they update to patched versions.

Compliance Impact

The provided CVE data does not specify how this vulnerability impacts compliance with standards like GDPR or HIPAA. The description only mentions a JIT miscompilation issue in Firefox's JavaScript: WebAssembly component without detailing potential compliance implications.

Mitigation Strategies

Update Firefox to version ESR 153.4, Firefox 157, or ESR 140.17 or later to address the JIT miscompilation issue in the JavaScript: WebAssembly component.

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