CVE-2026-6776

Received Received - Intake

Boundary Error in Firefox WebRTC Networking Causes Potential Exploit

Publication date: 2026-04-21

Last updated on: 2026-04-22

Assigner: Mozilla Corporation

Description

Incorrect boundary conditions in the WebRTC: Networking component. This vulnerability was fixed in Firefox 150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-04-21

Last Modified

2026-04-22

Generated

2026-07-06

AI Q&A

2026-04-21

EPSS Evaluated

2026-07-05

NVD

CVE-2026-6776

EUVD

EUVD-2026-24117

Affected Vendors & Products

Vendor	Product	Version / Range
mozilla	firefox	to 150.0 (exc)
mozilla	firefox	to 140.10.0 (exc)
mozilla	thunderbird	to 140.10.0 (exc)

Helpful Resources

Exploitability

CWE

KEV

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

Executive Summary

This vulnerability involves incorrect boundary conditions in the WebRTC Networking component of Mozilla Firefox. It means that the software did not properly handle certain limits or edges in the network communication 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.

Impact Analysis

Incorrect boundary conditions in a networking component like WebRTC could potentially lead to security risks such as crashes, data leaks, or unauthorized access during real-time communications. However, specific impacts are not detailed in the provided information.

Compliance Impact

There is no information provided about how this vulnerability affects compliance with standards or regulations such as GDPR or HIPAA.

Mitigation Strategies

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.

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