CVE-2026-6758
Use-After-Free in Firefox WebAssembly Causes 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 | thunderbird | to 150.0 (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 Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.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
Can you explain this vulnerability to me?
This vulnerability is a use-after-free issue in the JavaScript WebAssembly component of Firefox. A use-after-free occurs when a program continues to use memory after it has been freed, which can lead to unexpected behavior or security risks.
The issue was addressed and fixed in Firefox version 150.
How can this vulnerability impact me? :
Exploitation of a use-after-free vulnerability in the WebAssembly component could potentially allow an attacker to execute arbitrary code, cause a crash, or manipulate the browser's behavior in unintended ways.
This could lead to security risks such as unauthorized access to information or system compromise if the vulnerability is exploited.
What immediate steps should I take to mitigate this vulnerability?
The vulnerability is fixed in Firefox 150. To mitigate this vulnerability, you should update your Firefox browser to version 150 or later.