CVE-2026-74949
Undergoing Analysis Undergoing Analysis - In Progress

Privilege Escalation in Firefox via Graphics Canvas2D Use-After-Free

Publication date: 2026-08-18

Last updated on: 2026-08-18

Assigner: Mozilla Corporation

Description
Privilege escalation due to use-after-free in the Graphics: Canvas2D component. This vulnerability was fixed in Firefox 154, Firefox ESR 140.14, and Firefox ESR 153.1.

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Meta Information

Published
2026-08-18
Last Modified
2026-08-18
Generated
2026-08-18
AI Q&A
2026-08-18
EPSS Evaluated
N/A
NVD
CVE-2026-74949
EUVD
EUVD-2026-60755

Affected Vendors & Products

Showing 5 associated CPEs
Vendor Product Version / Range
mozilla firefox 154
mozilla firefox_esr to 140.14 (inc)
mozilla firefox_esr 153.1
mozilla firefox to 154 (inc)
mozilla firefox_esr to 153.1 (inc)

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This is a privilege escalation vulnerability caused by a use-after-free bug in Firefox's Graphics: Canvas2D component. A use-after-free occurs when a program continues to use memory after it has been freed, potentially allowing attackers to execute arbitrary code or escalate privileges.

Detection Guidance

This vulnerability is specific to Firefox versions before 154, Firefox ESR 140.14, and Firefox ESR 153.1. To detect it, check your installed Firefox version using commands like 'firefox --version' or 'about:support' in Firefox. If your version is below the fixed versions, the system is vulnerable.

Impact Analysis

If exploited, this vulnerability could allow an attacker to gain elevated access to your system, run malicious code, or install unauthorized software. Users of affected Firefox versions are at risk if they visit a specially crafted webpage.

Compliance Impact

The provided CVE data does not specify how this vulnerability impacts compliance with standards like GDPR or HIPAA. The description focuses on technical details of the issue without addressing regulatory implications.

Mitigation Strategies

Update Firefox to version 154 or later, Firefox ESR to version 140.14 or later, or Firefox ESR to version 153.1 or later to address the use-after-free vulnerability in Graphics: Canvas2D.

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