CVE-2026-100765
Received Received - Intake

Use-after-free in Firefox JavaScript WebAssembly

Publication date: 2026-09-29

Last updated on: 2026-09-29

Assigner: Mozilla Corporation

Description
Use-after-free in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox ESR 153.4 and Firefox 157.

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Meta Information

Published
2026-09-29
Last Modified
2026-09-29
Generated
2026-09-29
AI Q&A
2026-09-29
EPSS Evaluated
N/A
NVD
CVE-2026-100765
EUVD
EUVD-2026-88917

Affected Vendors & Products

Showing 2 associated CPEs
Vendor Product Version / Range
mozilla firefox to 153.4 (inc)
mozilla firefox to 157 (inc)

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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 use-after-free issue in the JavaScript WebAssembly component of Firefox. Use-after-free means a program tries to use memory after it has been freed, which can lead to crashes or arbitrary code execution. It was fixed in Firefox ESR 153.4 and Firefox 157.

Impact Analysis

This vulnerability could allow attackers to execute arbitrary code or crash the browser by exploiting the use-after-free flaw in the WebAssembly component. Users running vulnerable versions of Firefox may be at risk of remote code execution or denial-of-service attacks.

Mitigation Strategies

Update Firefox ESR to version 153.4 or Firefox to version 157 or later to address the use-after-free vulnerability in the JavaScript: WebAssembly component.

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