CVE-2026-6748
Received Received - Intake
Uninitialized Memory Vulnerability in Firefox Web Codecs Component

Publication date: 2026-04-21

Last updated on: 2026-04-22

Assigner: Mozilla Corporation

Description
Uninitialized memory in the Audio/Video: Web Codecs component. This vulnerability was fixed in Firefox 150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.
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Meta Information
Published
2026-04-21
Last Modified
2026-04-22
Generated
2026-06-16
AI Q&A
2026-04-21
EPSS Evaluated
2026-06-14
NVD
CVE-2026-6748
EUVD
EUVD-2026-24089
Affected Vendors & Products
Showing 3 associated CPEs
Vendor Product Version / Range
mozilla firefox to 150.0 (exc)
mozilla firefox to 140.10.0 (exc)
mozilla thunderbird to 140.10.0 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-457 The code uses a variable that has not been initialized, leading to unpredictable or unintended results.
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Executive Summary

This vulnerability involves uninitialized memory in the Audio/Video: Web Codecs component of Mozilla Firefox. Uninitialized memory means that the software may use memory that has not been properly set up, potentially leading to unexpected behavior or security issues.

The issue was addressed and fixed in Firefox version 150 and Firefox ESR 140.10.

Impact Analysis

Exploitation of uninitialized memory vulnerabilities can lead to various impacts such as information disclosure, application crashes, or potentially execution of arbitrary code. However, specific impacts for this vulnerability are not detailed in the provided information.

Mitigation Strategies

To mitigate this vulnerability, update your Firefox browser to version 150 or later, or Firefox ESR to version 140.10 or later, where the issue has been fixed.

Compliance Impact

The provided information does not specify any direct impact of CVE-2026-6748 on compliance with common standards and regulations such as GDPR or HIPAA.

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