Is CVE-2026-91804 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-91804?

CVE-2026-91804 has a CVSS v3 severity of HIGH (7.8).

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CVE-2026-91804

Description

A heap-based out-of-bounds write vulnerability exists in Foxit PDF Editor/Reader’s rendering of Circle annotations with malformed Cloudy appearance streams in specially crafted PDF files. Insufficient validation of the appearance geometry can result in memory corruption and application crashes.