CVE-2026-0885
Use-After-Free in Firefox JavaScript GC Causes Memory Corruption
Publication date: 2026-01-13
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 147 (exc) |
| mozilla | firefox_esr | to 140.7 (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 Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.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 flaw in the JavaScript garbage collection (GC) component of Firefox versions prior to 147 and Firefox ESR versions prior to 140.7. 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 issues.
How can this vulnerability impact me? :
Exploitation of this vulnerability could allow attackers to cause a denial of service or potentially execute arbitrary code by manipulating the browser's memory. This can compromise the security of the browser environment, leading to unauthorized actions or instability.
What immediate steps should I take to mitigate this vulnerability?
To mitigate this vulnerability, you should update Firefox to version 147 or later, or Firefox ESR to version 140.7 or later, where the issue has been fixed as part of security updates addressing multiple vulnerabilities including use-after-free bugs. [2]