CVE-2026-7322
Memory Corruption in Firefox and Thunderbird ESR Enables Code Execution
Publication date: 2026-04-28
Last updated on: 2026-05-01
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 | firefox | to 115.35.1 (exc) |
| mozilla | thunderbird | to 150.0.1 (exc) |
| mozilla | thunderbird | to 140.10.1 (exc) |
| mozilla | firefox | From 128.0 (inc) 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-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 Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.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 involves memory safety bugs found in specific versions of Firefox and Thunderbird, including Firefox ESR 115.35.0, 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's memory could be improperly accessed or modified.
It is presumed that with enough effort, some of these bugs could have been exploited to run arbitrary code, potentially allowing an attacker to execute malicious actions on the affected system.
The issue was fixed in later versions: Firefox 150.0.1, Firefox ESR 140.10.1, and Firefox ESR 115.35.1.
How can this vulnerability impact me? :
If exploited, this vulnerability could allow an attacker to run arbitrary code on your system through the affected versions of Firefox or Thunderbird.
This could lead to unauthorized actions such as installing malware, stealing data, or taking control of your device.
Using updated versions where the vulnerability is fixed is important to mitigate these risks.
What immediate steps should I take to mitigate this vulnerability?
To mitigate this vulnerability, update affected Mozilla products to the fixed versions: Firefox to version 150.0.1, Firefox ESR to versions 140.10.1 or 115.35.1, and Thunderbird ESR to version 140.10.1 or Thunderbird to 150.0.1.
How does this vulnerability affect compliance with common standards and regulations (like GDPR, HIPAA)?:
The provided information does not specify how this vulnerability affects compliance with common standards and regulations such as GDPR or HIPAA.