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4.3Medium CVE-2026-84126 Mozilla

Incorrect boundary conditions in the Layout: Grid component.

Incorrect boundary conditions in the Layout: Grid component. This vulnerability was fixed in Firefox 155 and Thunderbird 155.

Published 01 Sep 2026 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N EPSS 0.2%

What happened

Incorrect boundary conditions in the Layout: Grid component. This vulnerability was fixed in Firefox 155 and Thunderbird 155.

Does it affect you

Not enough information

No products recorded, so this cannot be matched against anything.

What to do

  • Follow the vendor advisory for the fixed release and any interim mitigation.
    mozilla.org
  • Follow the vendor advisory for the fixed release and any interim mitigation.
    mozilla.org

Vendor's affected list

firefox
Everything below 155.0.0

Sources

A verdict here is derived from what you told us and what the vendor published. It is not an assessment of your environment. Why we never say you are safe.