CVE-2026-6748
Uninitialized Memory Vulnerability in Firefox Web Codecs Component
Publication date: 2026-04-21
Last updated on: 2026-04-22
Assigner: Mozilla Corporation
Description
Description
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| 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 ID | Description |
|---|---|
| CWE-457 | The code uses a variable that has not been initialized, leading to unpredictable or unintended results. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
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.
How can this vulnerability impact me? :
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.
What immediate steps should I take to mitigate this vulnerability?
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.
How does this vulnerability affect compliance with common standards and regulations (like GDPR, HIPAA)?:
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.