CVE-2026-0892
Memory Corruption in Firefox and Thunderbird <147 Enables Code Execution
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 | thunderbird | to 147 (exc) |
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| CWE-119 | The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
This vulnerability involves memory safety bugs in Firefox 146 and Thunderbird 146. Some of these bugs show evidence of memory corruption, which could potentially be exploited by attackers to run arbitrary code on affected systems. It affects Firefox versions earlier than 147.
How can this vulnerability impact me? :
The vulnerability can lead to severe impacts including unauthorized code execution, which means attackers could potentially take control of your system, compromise data integrity, and disrupt availability. The CVSS score of 9.8 indicates a critical severity with high impact on confidentiality, integrity, and availability.
What immediate steps should I take to mitigate this vulnerability?
To mitigate this vulnerability, you should update Firefox to version 147 or later, as the issue affects Firefox versions prior to 147 and was addressed in Firefox 147. [1]