CVE-2026-4711
Received Received - Intake
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
Use-after-free in the Widget: Cocoa component. This vulnerability was fixed in Firefox 149, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.
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Meta Information
Published
2026-03-24
Last Modified
2026-04-13
Generated
2026-06-16
AI Q&A
2026-03-24
EPSS Evaluated
2026-06-15
NVD
CVE-2026-4711
EUVD
EUVD-2026-14837
Affected Vendors & Products
Showing 2 associated CPEs
Vendor Product Version / Range
mozilla firefox to 149.0 (exc)
mozilla firefox to 140.9.0 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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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 Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.
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Executive Summary

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.

Impact Analysis

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.

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