CVE-2026-91811
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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 PRC parser due to insufficient validation of vertex indices in triangular fan texture meshes. Successful exploitation could result in memory corruption and an application crash.

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Meta Information

Published
2026-09-23
Last Modified
2026-09-23
Generated
2026-10-14
AI Q&A
2026-09-23
EPSS Evaluated
2026-10-12
NVD
CVE-2026-91811
EUVD
EUVD-2026-85163

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's PRC parser. It occurs due to insufficient validation of vertex indices in triangular fan texture meshes. This flaw allows memory corruption, which could lead to application crashes.

Detection Guidance

This vulnerability involves a heap-based out-of-bounds write in Foxit PDF Editor/Reader's PRC parser. Detection typically requires analyzing PDF files for malformed triangular fan texture mesh data. Use Foxit's built-in update checks or scan files with PDF analysis tools like pdfid or peepdf to identify suspicious structures.

Impact Analysis

Exploitation could allow attackers to corrupt memory, potentially leading to application crashes or arbitrary code execution. This may result in unauthorized access to sensitive data or system control if combined with other vulnerabilities.

Compliance Impact

This vulnerability could lead to memory corruption and application crashes, potentially exposing sensitive data processed by Foxit PDF Editor/Reader. Such issues may violate compliance requirements under GDPR (data protection) and HIPAA (healthcare data security) if exploited to access or leak protected information.

Mitigation Strategies

Update Foxit PDF Editor or Reader to the latest version that patches this vulnerability. Avoid opening untrusted PDF files, especially those from unknown sources. Disable PRC parsing features if not required.

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