REDHAT-BUG-2571126: High severity vulnerability

Published Nov 10, 2026

Updated

Incorrect boundary conditions in the Layout: Text and Fonts component. This vulnerability was fixed in Firefox 160, Firefox ESR 153.7, and Thunderbird 160.

Affected Software

0 affected components

Remediation

Recommended actions to resolve this vulnerability, in priority order.

Upgrade
Upgrade Firefox to a version that resolves this vulnerability.
Fixed in 160
Upgrade
Upgrade Firefox ESR to a version that resolves this vulnerability.
Fixed in 153.7
Upgrade
Upgrade Thunderbird to a version that resolves this vulnerability.
Fixed in 160

Event History

Nov 10, 2026

Data Sourced

via Red Hat·08:41 PM

DescriptionSeverityAffected Software

Frequently Asked Questions

Which versions contain the fix?

The issue was fixed in Firefox 160, Firefox ESR 153.7, and Thunderbird 160.

How can I obtain the relevant vendor remediation?

Red Hat has published remediation information in RHSA-2026:99110, RHSA-2026:99111, and RHSA-2026:99112.