CVE-2026-16368

Analyzed Analyzed - Analysis Complete

Incorrect Boundary Handling in Firefox JavaScript WebAssembly

Publication date: 2026-07-21

Last updated on: 2026-07-24

Assigner: Mozilla Corporation

Description

Incorrect boundary conditions in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox 153, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-07-21

Last Modified

2026-07-24

Generated

2026-08-10

AI Q&A

2026-07-21

EPSS Evaluated

2026-08-09

NVD

CVE-2026-16368

EUVD

EUVD-2026-46201

Affected Vendors & Products

Vendor	Product	Version / Range
mozilla	firefox	to 153.0.0 (exc)
mozilla	firefox	to 140.13.0 (exc)
mozilla	thunderbird	to 140.13.0 (exc)
mozilla	thunderbird	From 141.0 (inc) to 153.0 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-119	The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.

Attack-Flow Graph

Executive Summary

This vulnerability involves incorrect boundary conditions in the JavaScript: WebAssembly component of Firefox and Firefox ESR. It was addressed in Firefox version 153 and Firefox ESR version 140.13.

Detection Guidance

This vulnerability is specific to Firefox 153 and Firefox ESR 140.13. Detection involves checking the installed version of Firefox or Firefox ESR. Use commands like 'firefox --version' or 'firefox-esr --version' to verify the version. If the version is below the fixed releases, the system is vulnerable.

Impact Analysis

An attacker could exploit this flaw to execute arbitrary code or cause a denial of service by triggering boundary condition errors in WebAssembly interactions within Firefox.

Compliance Impact

The provided CVE data does not specify how this vulnerability impacts compliance with standards like GDPR or HIPAA. The description only mentions incorrect boundary conditions 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 vulnerability.

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