REDHAT-BUG-2517863: High severity Mozilla Firefox vulnerability

Q: Which Firefox releases contain the fix?

The issue was fixed in Firefox 154, Firefox ESR 115.39, Firefox ESR 140.14, and Firefox ESR 153.1.

Q: What is the impact of this issue?

The vulnerability is an information disclosure issue in Firefox's Graphics: Text component and is rated high severity.

Published Aug 18, 2026

Updated

Information disclosure in the Graphics: Text component. This vulnerability was fixed in Firefox 154, Firefox ESR 115.39, Firefox ESR 140.14, and Firefox ESR 153.1.

Affected Software

1 affected component

Mozilla Firefox<154, <115.39, <140.14, <153.1

Remediation

Recommended actions to resolve this vulnerability, in priority order.

Upgrade
Upgrade Firefox to a version that resolves this vulnerability.
Fixed in 154
Upgrade
Upgrade Firefox ESR to a version that resolves this vulnerability.
Fixed in 115.39
Upgrade
Upgrade Firefox ESR to a version that resolves this vulnerability.
Fixed in 140.14
Upgrade
Upgrade Firefox ESR to a version that resolves this vulnerability.
Fixed in 153.1

Event History

Aug 18, 2026

Data Sourced

via Red Hat·12:56 PM

DescriptionSeverityAffected Software

Frequently Asked Questions

Which Firefox releases contain the fix?

The issue was fixed in Firefox 154, Firefox ESR 115.39, Firefox ESR 140.14, and Firefox ESR 153.1.

What is the impact of this issue?

The vulnerability is an information disclosure issue in Firefox's Graphics: Text component and is rated high severity.