CVE-2026-6753
Boundary Condition Error in Firefox WebRTC Causes Potential Exploit
Publication date: 2026-04-21
Last updated on: 2026-04-22
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 (exc) |
| mozilla | firefox | to 140.10.0 (exc) |
| mozilla | thunderbird | From 140.0 (inc) to 140.10.0 (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 incorrect boundary conditions in the WebRTC component of Mozilla Firefox. It means that the software did not properly handle certain limits or edges in the WebRTC code, which could potentially lead to unexpected behavior or security issues. The problem was addressed and fixed in Firefox version 150 and Firefox ESR 140.10.
What immediate steps should I take to mitigate this vulnerability?
To mitigate this vulnerability, update your Firefox browser to version 150 or later, or Firefox ESR to version 140.10 or later, where the issue has been fixed.
How can this vulnerability impact me? :
This vulnerability involves incorrect boundary conditions in the WebRTC component, which could potentially lead to unexpected behavior or security issues when using affected versions of Firefox or Thunderbird.
It was fixed in Firefox 150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10, so using versions prior to these may expose you to risks related to this vulnerability.