Incorrect boundary conditions in the Layout: Block and Inline component

Summary

Incorrect boundary conditions in the Layout: Block and Inline component. This vulnerability was fixed in Firefox 159.0.1.

Remediation

1. Inventory every Mozilla Firefox deployment, including staging.
2. No fixed version appears in the public sources yet. Check the references below and the vendor directly.

References

• Referencehttps://bugzilla.mozilla.org/show_bug.cgi?id=2079035
• Referencehttps://www.mozilla.org/security/advisories/mfsa2026-123/