CVE-2026-16369
Received Received - Intake

Integer Overflow in Firefox JavaScript WebAssembly

Publication date: 2026-07-21

Last updated on: 2026-07-21

Assigner: Mozilla Corporation

Description
Integer overflow in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox 153 and Firefox ESR 140.13.

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Meta Information

Published
2026-07-21
Last Modified
2026-07-21
Generated
2026-07-21
AI Q&A
2026-07-21
EPSS Evaluated
N/A
NVD
CVE-2026-16369
EUVD
EUVD-2026-46202

Affected Vendors & Products

Showing 4 associated CPEs
Vendor Product Version / Range
mozilla firefox to 153 (inc)
mozilla firefox_esr to 140.13 (inc)
mozilla firefox 153
mozilla firefox_esr 140.13

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 an integer overflow in the JavaScript WebAssembly component of Firefox. An integer overflow occurs when a calculation produces a result larger than the maximum value that can be stored in the variable's data type, potentially leading to unexpected behavior or crashes.

Impact Analysis

This vulnerability could allow an attacker to cause a crash or execute arbitrary code in the affected browser. Users running vulnerable versions of Firefox or Firefox ESR may be at risk of denial-of-service attacks or code execution by malicious websites.

Compliance Impact

The provided CVE data does not specify how this vulnerability impacts compliance with standards like GDPR or HIPAA. The description only mentions an integer overflow in the JavaScript WebAssembly component fixed in Firefox 153 and Firefox ESR 140.13.

Mitigation Strategies

Update Firefox to version 153 or later and Firefox ESR to version 140.13 or later to address the integer overflow in the JavaScript: WebAssembly component.

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