REDHAT-BUG-2533743: Medium severity Mozilla Firefox vulnerability

Q: Which Firefox releases contain the fix?

The issue was fixed in Firefox 156, Firefox ESR 140.16, and Firefox ESR 153.3.

Q: Which product branches should be checked for exposure?

Check deployments of Mozilla Firefox, Mozilla Firefox ESR 140, and Mozilla Firefox ESR 153. Compare the installed version with the fixed release for the applicable branch.

Published Sep 15, 2026

Updated

Sandbox escape due to invalid pointer in the Graphics component. This vulnerability was fixed in Firefox 156, Firefox ESR 140.16, and Firefox ESR 153.3.

Affected Software

3 affected components

Mozilla Firefox<156

Mozilla Firefox ESR 140<140.16

Mozilla Firefox ESR 153<153.3

Remediation

Recommended actions to resolve this vulnerability, in priority order.

Upgrade
Upgrade Firefox to a version that resolves this vulnerability.
Fixed in 156
Upgrade
Upgrade Firefox ESR to a version that resolves this vulnerability.
Fixed in 140.16
Upgrade
Upgrade Firefox ESR to a version that resolves this vulnerability.
Fixed in 153.3

Event History

Sep 15, 2026

Data Sourced

via Red Hat·12:46 PM

DescriptionSeverityAffected Software

Frequently Asked Questions

Which Firefox releases contain the fix?

The issue was fixed in Firefox 156, Firefox ESR 140.16, and Firefox ESR 153.3.

Which product branches should be checked for exposure?

Check deployments of Mozilla Firefox, Mozilla Firefox ESR 140, and Mozilla Firefox ESR 153. Compare the installed version with the fixed release for the applicable branch.

REDHAT-BUG-2533743: Medium severity Mozilla Firefox vulnerability

Affected Software

Remediation

Event History

Frequently Asked Questions

Which Firefox releases contain the fix?

Which product branches should be checked for exposure?

Company

Resources

Contact

Frequently Asked Questions

Which Firefox releases contain the fix?

Which product branches should be checked for exposure?