Mozilla Releases Firefox 159.0.1 to Patch High-Severity Layout Vulnerability CVE-2026-120572
Mozilla Foundation has released Firefox 159.0.1 as a security update addressing a vulnerability in the browser's layout engine.
The flaw, identified as CVE-2026-120572, affects the Layout: Block and Inline component. It involves improper boundary condition handling that could lead to unexpected behavior during web page rendering.
Both Mozilla and the US Cybersecurity and Infrastructure Security Agency (CISA) rate the issue as high severity. CISA assigned a CVSSv3.1 base score of 8.8, placing it in the second-highest impact category.
The update was made available on November 3, 2026. Administrators and end users should deploy Firefox 159.0.1 without delay to eliminate exposure to this vulnerability.
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