CVE-2026-2766
Received
Received - Intake
Use-After-Free in Firefox JIT Engine Enables Code Execution
Publication date: 2026-02-24
Last updated on: 2026-04-13
Assigner: Mozilla Corporation
Description
Description
Use-after-free in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 148, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8.
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| mozilla | firefox | to 148.0 (exc) |
| mozilla | thunderbird | to 148.0 (exc) |
| mozilla | thunderbird | to 140.8.0 (exc) |
| mozilla | firefox | to 140.8.0 (exc) |
Helpful Resources
Exploitability
CWE
KEV
| 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 Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.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's Just-In-Time (JIT) compilation component of Firefox browsers. It affects versions of Firefox earlier than 148 and Firefox ESR earlier than 140.8.
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How can this vulnerability be detected on my network or system? Can you suggest some commands?
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