CVE-2026-92067

Analyzed Analyzed - Analysis Complete

Use-after-free in Firefox Gtk Widget

Publication date: 2026-09-15

Last updated on: 2026-10-05

Assigner: Mozilla Corporation

Description

Use-after-free in the Widget: Gtk component. This vulnerability was fixed in Firefox 156, Firefox ESR 153.3, and Thunderbird 156.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-09-15

Last Modified

2026-10-05

Generated

2026-10-06

AI Q&A

2026-09-15

EPSS Evaluated

2026-10-04

NVD

CVE-2026-92067

EUVD

EUVD-2026-78452

Affected Vendors & Products

Vendor	Product	Version / Range
mozilla	thunderbird	From 154.0 (inc) to 156.0 (exc)
mozilla	firefox	to 153.3.0 (exc)
mozilla	firefox	From 154.0.0 (inc) to 156.0.0 (exc)
mozilla	thunderbird	to 153.3.0 (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 Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.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 use-after-free vulnerability in the Widget: Gtk component of Firefox. Use-after-free means a program tries to use memory after it has been freed, which can lead to crashes or arbitrary code execution. It was fixed in Firefox 156 and Firefox ESR 153.3.

Detection Guidance

This vulnerability is specific to Firefox and Thunderbird versions before 156 (or ESR 153.3). Detection involves checking installed versions of these applications. Use commands like 'firefox --version' or 'thunderbird --version' to verify if your system is affected. If versions are below the patched releases, the system is vulnerable.

Impact Analysis

This vulnerability could allow an attacker to execute arbitrary code on your system by exploiting the use-after-free flaw in Firefox's Gtk component. This might lead to system compromise, data theft, or installation of malware if you are using an affected version of Firefox.

Compliance Impact

The provided CVE data does not specify how this vulnerability affects compliance with standards like GDPR or HIPAA. The description only mentions a use-after-free issue in Firefox's Gtk component, fixed in Firefox 156 and ESR 153.3, without details on potential data exposure or regulatory impact.

Mitigation Strategies

Update Firefox to version 156 or later and Firefox ESR to version 153.3 or later to address the use-after-free vulnerability in the Widget: Gtk component.

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