REDHAT-BUG-2550425: Medium severity Mozilla Firefox vulnerability

The issue was fixed in Firefox 158, Firefox ESR 115.43, and Firefox ESR 153.5.

Review deployments of Mozilla Firefox, Mozilla Firefox ESR 115, and Mozilla Firefox ESR 153.

Published Oct 13, 2026

Updated

Incorrect boundary conditions in the Layout component. This vulnerability was fixed in Firefox 158, Firefox ESR 115.43, and Firefox ESR 153.5.

Affected Software

3 affected components

Mozilla Firefox<158

Mozilla Firefox ESR 115<115.43

Mozilla Firefox ESR 153<153.5

Recommended actions to resolve this vulnerability, in priority order.

Upgrade
Upgrade Firefox to a version that resolves this vulnerability.
Fixed in 158
Upgrade
Upgrade Firefox ESR to a version that resolves this vulnerability.
Fixed in 115.43
Upgrade
Upgrade Firefox ESR to a version that resolves this vulnerability.
Fixed in 153.5

Oct 13, 2026

Data Sourced

via Red Hat·01:00 PM

DescriptionSeverityAffected Software

The issue was fixed in Firefox 158, Firefox ESR 115.43, and Firefox ESR 153.5.

Review deployments of Mozilla Firefox, Mozilla Firefox ESR 115, and Mozilla Firefox ESR 153.