CVE-2026-92056

Received Received - Intake

Use-after-free in Firefox Graphics Text Component

Publication date: 2026-09-15

Last updated on: 2026-10-05

Assigner: Mozilla Corporation

Description

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

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-09-15

Last Modified

2026-10-05

Generated

2026-10-05

AI Q&A

2026-09-15

EPSS Evaluated

2026-10-04

NVD

CVE-2026-92056

EUVD

EUVD-2026-78519

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 Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.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 Graphics Text component of Firefox. Use-after-free means the software 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 fixed in Firefox 156 and Firefox ESR 153.3. Detection involves checking installed versions of Firefox or Firefox ESR. Use commands like 'firefox --version' or 'apt list --installed | grep firefox' to verify versions. If versions are below the patched releases, the system is vulnerable.

Impact Analysis

An attacker could exploit this to crash your browser or run malicious code on your device. This could allow them to steal data, install malware, or take control of your system. Updating to the fixed versions mitigates the risk.

Compliance Impact

This vulnerability does not provide specific details about compliance impacts on standards like GDPR or HIPAA. The description only mentions a use-after-free issue in Firefox's Graphics: Text component, fixed in Firefox 156, Firefox ESR 153.3, and Thunderbird 156.

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 Graphics: Text component.

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