CVE-2026-100761

Analyzed Analyzed - Analysis Complete

Privilege Escalation in Firefox via WebGPU Use-After-Free

Publication date: 2026-09-29

Last updated on: 2026-10-13

Assigner: Mozilla Corporation

Description

Privilege escalation due to use-after-free in the Graphics: WebGPU component. This vulnerability was fixed in Thunderbird 157 and Firefox 157.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-09-29

Last Modified

2026-10-13

Generated

2026-10-19

AI Q&A

2026-09-29

EPSS Evaluated

2026-10-18

NVD

CVE-2026-100761

EUVD

EUVD-2026-88913

Affected Vendors & Products

Vendor	Product	Version / Range
mozilla	firefox	to 157.0.0 (exc)
mozilla	thunderbird	to 157.0 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-416	The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

Attack-Flow Graph

Executive Summary

This is a privilege escalation vulnerability caused by a use-after-free bug in the Graphics: WebGPU component of Firefox. 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's Graphics: WebGPU component and was fixed in Firefox 157. Detection involves checking Firefox version and monitoring for use-after-free patterns in WebGPU operations. Commands include checking Firefox version with 'firefox --version' and inspecting crash logs for WebGPU-related errors.

Impact Analysis

An attacker could exploit this to run malicious code on your system, gain unauthorized access, or perform actions with elevated privileges. This could lead to data theft, system compromise, or further attacks within your network.

Compliance Impact

The vulnerability involves privilege escalation due to a use-after-free in Firefox's Graphics: WebGPU component. This could allow attackers to gain unauthorized access or execute arbitrary code, potentially leading to data breaches or unauthorized data processing. Such breaches may violate GDPR's data protection requirements or HIPAA's safeguards for protected health information if exploited in relevant systems.

Mitigation Strategies

Update Firefox to version 157 or later to address the use-after-free vulnerability in the Graphics: WebGPU component.

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