CVE-2026-117921

None

CVSS

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EPSS

0.2%

Published

Oct 27, 2026

CISA due date

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The record

Use-after-free in the CSS Parsing and Computation component. This vulnerability was fixed in Firefox 159, Firefox ESR 115.44, Firefox ESR 153.6, Thunderbird 159, and Thunderbird 153.6.

Affected packages

Ecosystem	Package	Introduced	Fixed