CVE-2026-6747
Use-After-Free in Firefox WebRTC Enables Potential Exploits
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-416 | The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer. |
Attack-Flow Graph
AI Powered Q&A
How can this vulnerability impact me? :
Exploitation of a use-after-free vulnerability in the WebRTC component could potentially allow an attacker to execute arbitrary code, cause a crash, or manipulate the affected application in unintended ways. This could compromise the security and stability of the browser.
What immediate steps should I take to mitigate this vulnerability?
To mitigate this use-after-free vulnerability in the WebRTC component, you should update your Firefox browser to version 150 or later, or Firefox ESR to version 140.10 or later, where the issue has been fixed.
Can you explain this vulnerability to me?
This vulnerability is a use-after-free issue in the WebRTC component of Mozilla Firefox. A use-after-free vulnerability occurs when a program continues to use a pointer after the memory it points to has been freed, which can lead to unexpected behavior or security risks.
The issue was addressed and fixed in Firefox version 150 and Firefox ESR 140.10.