CVE-2026-91804 Foxit PDF Editor/Reader - Out of Bounds Write

Foxit PDF Editor/Reader contains a heap-based out-of-bounds write caused by insufficient validation of Circle annotation appearance geometry in rendering malformed Cloudy appearance streams, letting attackers cause memory corruption and crashes, exploit requires crafted PDF file.

CVSS base score 7.8 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.12% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Out of Bounds Write
Impact
Denial Of Service
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Published
23 September 2026
Updated
15 October 2026
Weakness
CWE-787

Vendor fix

Update to the latest version of Foxit PDF Editor/Reader.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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