CVE-2026-4723
Use-After-Free in Firefox JavaScript Engine Before
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) |
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 Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.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 Engine component of Firefox versions earlier than 149. A use-after-free occurs when a program continues to use a pointer after the memory it points to has been freed, which can lead to unpredictable behavior or exploitation.
How can this vulnerability impact me? :
Exploitation of this use-after-free vulnerability could allow an attacker to execute arbitrary code, cause a crash, or otherwise compromise the security of the affected Firefox browser. This could lead to unauthorized access to user data or system resources.
How does this vulnerability affect compliance with common standards and regulations (like GDPR, HIPAA)?:
I don't know
How can this vulnerability be detected on my network or system? Can you suggest some commands?
I don't know
What immediate steps should I take to mitigate this vulnerability?
I don't know