Vulnerability/
REDHAT-BUG-2550403

REDHAT-BUG-2550403: High severity Mozilla Firefox vulnerability

Q: Which Firefox versions contain the fix?

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

Published Oct 13, 2026

Updated

Incorrect boundary conditions in the JavaScript Engine 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

Remediation

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 115 to a version that resolves this vulnerability.
Fixed in 115.43
Upgrade
Upgrade Firefox ESR 153 to a version that resolves this vulnerability.
Fixed in 153.5

Event History

Oct 13, 2026

Data Sourced

via Red Hat·12:54 PM

DescriptionSeverityAffected Software

Frequently Asked Questions

Which Firefox versions contain the fix?

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

Company

Resources

Contact

SecAlerts Pty Ltd.
132 Wickham Terrace
Fortitude Valley,
QLD 4006, Australia
info@secalerts.co

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