CVE-2026-6749

Modified Modified - Updated After Analysis

Information Disclosure via Uninitialized Memory in Firefox Canvas2D

Publication date: 2026-04-21

Last updated on: 2026-06-30

Assigner: Mozilla Corporation

Description

Information disclosure due to uninitialized memory in the Graphics: Canvas2D 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

Probability:
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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-2026-6749

EUVD

EUVD-2026-24090

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	to 140.10.0 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-824	The product accesses or uses a pointer that has not been initialized.
CWE-908	The product uses or accesses a resource that has not been initialized.

Attack-Flow Graph

Executive Summary

This vulnerability is an information disclosure issue caused by uninitialized memory in the Graphics: Canvas2D component of Firefox. Essentially, some memory that should have been properly initialized before use was not, which could lead to unintended exposure of sensitive data.

Impact Analysis

The impact of this vulnerability is information disclosure. An attacker could potentially access sensitive information from uninitialized memory within the Canvas2D graphics component, which might include data from other processes or users.

Mitigation Strategies

To mitigate this vulnerability, update your Firefox browser to version 150 or later, or update Firefox ESR to versions 115.35 or 140.10 or later where the issue has been fixed.

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