CVE-2026-4711
Use-After-Free in Firefox Cocoa Widget Enables Potential Exploits
Publication date: 2026-03-24
Last updated on: 2026-04-13
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 149.0 (exc) |
| mozilla | firefox | to 140.9.0 (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 Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.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 Widget: Cocoa component of Mozilla Firefox. It affects versions of Firefox earlier than 149 and Firefox ESR earlier than 140.9. A use-after-free vulnerability occurs when a program continues to use memory after it has been freed, which can lead to unexpected behavior or exploitation.
How can this vulnerability impact me? :
Exploitation of a use-after-free vulnerability can potentially allow an attacker to execute arbitrary code, cause a program crash, or lead to other unintended behaviors. In the context of Firefox, this could compromise the security and stability of the browser, potentially exposing users to further attacks or data breaches.
How does this vulnerability affect compliance with common standards and regulations (like GDPR, HIPAA)?:
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How can this vulnerability be detected on my network or system? Can you suggest some commands?
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What immediate steps should I take to mitigate this vulnerability?
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