CVE-2026-4720
Memory Corruption in Firefox and Thunderbird Enables Code Execution
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) |
| mozilla | firefox | to 140.9.0 (exc) |
| mozilla | thunderbird | to 149.0 (exc) |
| mozilla | thunderbird | to 140.9.0 (exc) |
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| CWE-120 | The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
This vulnerability involves memory safety bugs found in Firefox ESR 140.8, Thunderbird ESR 140.8, Firefox 148, and Thunderbird 148. Some of these bugs showed signs of memory corruption, which means that with enough effort, an attacker could potentially exploit them to execute arbitrary code on the affected systems.
How can this vulnerability impact me? :
The impact of this vulnerability could be severe because it may allow an attacker to run arbitrary code on your device. This could lead to unauthorized access, data theft, or control over your system if you are using affected versions of Firefox or Thunderbird.
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