CVE-2026-92009

Analyzed Analyzed - Analysis Complete

Privilege Escalation in Firefox Graphics CanvasWebGL

Publication date: 2026-09-15

Last updated on: 2026-10-06

Assigner: Mozilla Corporation

Description

Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component. This vulnerability was fixed in Firefox 156, Firefox ESR 115.41, Firefox ESR 140.16, Firefox ESR 153.3, Thunderbird 156, and Thunderbird 140.16.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-09-15

Last Modified

2026-10-06

Generated

2026-10-19

AI Q&A

2026-09-15

EPSS Evaluated

2026-10-18

NVD

CVE-2026-92009

EUVD

EUVD-2026-78472

Affected Vendors & Products

Vendor	Product	Version / Range
mozilla	thunderbird	to 140.16.0 (exc)
mozilla	thunderbird	From 141.0 (inc) to 153.3.0 (exc)
mozilla	thunderbird	From 154.0 (inc) to 156.0 (exc)
mozilla	firefox	From 154.0.0 (inc) to 156.0.0 (exc)
mozilla	firefox	From 141.0 (inc) to 153.3.0 (exc)
mozilla	firefox	to 115.41.0 (exc)
mozilla	firefox	From 116.0 (inc) to 140.16.0 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-120	The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer.

Attack-Flow Graph

Executive Summary

CVE-2026-92009 is a high-severity privilege escalation vulnerability in Firefox and Firefox ESR browsers. It occurs due to incorrect boundary conditions in the Graphics: CanvasWebGL component, allowing an attacker to gain elevated privileges on the affected system.

Detection Guidance

This vulnerability is specific to Firefox and Firefox ESR versions prior to 156, 115.41, 140.16, and 153.3. Detection involves checking installed Firefox versions and comparing them against these patched versions. Use commands like 'firefox --version' or 'apt list --installed | grep firefox' to verify versions.

Impact Analysis

This vulnerability could allow an attacker to escalate their privileges, potentially leading to unauthorized access or control over your system. It may enable them to execute arbitrary code, install malware, or steal sensitive data.

Compliance Impact

The vulnerability allows privilege escalation, which could lead to unauthorized access or control over systems. This may violate compliance requirements under GDPR (data protection) and HIPAA (health data security) by enabling unauthorized data access or modification.

Mitigation Strategies

Update Firefox to version 156 or later, Firefox ESR to version 115.41 or later, Firefox ESR to version 140.16 or later, or Firefox ESR to version 153.3 or later to address the privilege escalation vulnerability in the Graphics: CanvasWebGL component.

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