CVE-2026-7323
Memory Corruption in Firefox and Thunderbird Enables Code Execution
Publication date: 2026-04-28
Last updated on: 2026-04-30
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 150.0.1 (exc) |
| mozilla | thunderbird | to 150.0.1 (exc) |
| mozilla | firefox | to 140.10.1 (exc) |
| mozilla | thunderbird | to 140.10.1 (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. |
| CWE-787 | The product writes data past the end, or before the beginning, of the intended buffer. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
This vulnerability involves memory safety bugs found in specific versions of Firefox and Thunderbird, including Firefox ESR 140.10.0, Thunderbird ESR 140.10.0, Firefox 150.0.0, and Thunderbird 150.0.0.
Some of these bugs showed evidence of memory corruption, which means that the software could access or modify memory in unintended ways.
It is presumed that with enough effort, some of these bugs could have been exploited by attackers to run arbitrary code on affected systems.
The issue was fixed in Firefox 150.0.1 and Firefox ESR 140.10.1.
How can this vulnerability impact me? :
This vulnerability can potentially allow attackers to execute arbitrary code on your system if you are using the affected versions of Firefox or Thunderbird.
Exploitation of memory corruption bugs can lead to unauthorized control over your device, which may result in data theft, system compromise, or further malware installation.
Updating to the fixed versions (Firefox 150.0.1 and Firefox ESR 140.10.1) is recommended to mitigate this risk.
What immediate steps should I take to mitigate this vulnerability?
To mitigate this vulnerability, update Firefox and Thunderbird to the fixed versions: Firefox 150.0.1 and Firefox ESR 140.10.1.