CVE-2026-91804
Received Received - Intake

Heap-based Out-of-Bounds Write in Foxit PDF Editor/Reader

Publication date: 2026-09-23

Last updated on: 2026-09-23

Assigner: Foxit

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.

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Meta Information

Published
2026-09-23
Last Modified
2026-09-23
Generated
2026-09-23
AI Q&A
2026-09-23
EPSS Evaluated
N/A
NVD
CVE-2026-91804
EUVD
EUVD-2026-85119

Affected Vendors & Products

Showing 2 associated CPEs
Vendor Product Version / Range
foxit pdf_editor *
foxit pdf_reader *

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-787 The product writes data past the end, or before the beginning, of the intended buffer.

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Executive Summary

This is a heap-based out-of-bounds write vulnerability in Foxit PDF Editor/Reader. It occurs when processing Circle annotations with malformed Cloudy appearance streams in specially crafted PDF files. The software fails to properly validate the appearance geometry, leading to memory corruption and potential application crashes.

Impact Analysis

An attacker could exploit this to execute arbitrary code on your system, gain unauthorized access, or cause denial-of-service conditions by crashing the application. This requires tricking you into opening a malicious PDF file.

Mitigation Strategies

Update Foxit PDF Editor or Reader to the latest version to patch the vulnerability. Avoid opening untrusted PDF files, especially those with Circle annotations or Cloudy appearance streams. Disable JavaScript in Foxit PDF Reader if not required.

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