CVE-2026-6752

Modified Modified - Updated After Analysis

Boundary Condition Error in Firefox WebRTC Risks Memory Corruption

Publication date: 2026-04-21

Last updated on: 2026-06-30

Assigner: Mozilla Corporation

Description

Incorrect boundary conditions in the WebRTC component. This vulnerability was fixed in Firefox 150, Firefox ESR 115.35, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-04-21

Last Modified

2026-06-30

Generated

2026-07-06

AI Q&A

2026-04-21

EPSS Evaluated

2026-07-05

NVD

CVE-2026-6752

EUVD

EUVD-2026-24093

Affected Vendors & Products

Vendor	Product	Version / Range
mozilla	firefox	to 150.0 (exc)
mozilla	firefox	to 115.35.0 (exc)
mozilla	firefox	From 140.0 (inc) to 140.10.0 (exc)
mozilla	thunderbird	From 140.0 (inc) to 140.10.0 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-131	The product does not correctly calculate the size to be used when allocating a buffer, which could lead to a buffer overflow.
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

Impact Analysis

This vulnerability involves incorrect boundary conditions in the WebRTC component of Firefox. Such issues can potentially lead to unexpected behavior or security risks when using WebRTC features in affected Firefox versions prior to the fixes.

The vulnerability was fixed in Firefox 150, Firefox ESR 115.35, and Firefox ESR 140.10, so using these or later versions mitigates the risk.

Executive Summary

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 versions 150, Firefox ESR 115.35, and Firefox ESR 140.10.

Mitigation Strategies

To mitigate this vulnerability, update your Firefox browsers to the fixed versions: Firefox 150, Firefox ESR 115.35, or Firefox ESR 140.10.

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