CVE-2026-91809: Use After Free (CWE-416) in Foxit Software Inc. Foxit PDF Editor
A use-after-free vulnerability exists in Foxit PDF Editor/Reader’s handling of malformed PDF form fields. Improper validation during field-name traversal may cause the application to access a released object, resulting in an application crash.
AI Analysis
Technical Summary
A use-after-free vulnerability (CWE-416) exists in Foxit PDF Editor/Reader when processing malformed PDF form fields. Improper validation during traversal of field names may cause the software to access memory that has already been freed, resulting in an application crash. The vulnerability is local attack vector with low attack complexity, no privileges required, but requires user interaction. It impacts confidentiality, integrity, and availability with high impact ratings.
Potential Impact
Successful exploitation can cause the Foxit PDF Editor or Reader to crash, potentially leading to denial of service. The CVSS vector indicates high impact on confidentiality, integrity, and availability, but no known exploits are currently reported in the wild.
Mitigation Recommendations
No patch or official fix information is currently provided. Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, users should exercise caution when opening PDF files from untrusted sources.
CVE-2026-91809: Use After Free (CWE-416) in Foxit Software Inc. Foxit PDF Editor
Description
A use-after-free vulnerability exists in Foxit PDF Editor/Reader’s handling of malformed PDF form fields. Improper validation during field-name traversal may cause the application to access a released object, resulting in an application crash.
CVSS v3.1
Score 7.8high
Affected software
Foxit Software Inc.
Foxit PDF Editor
Foxit Software Inc.
Foxit PDF Reader
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
A use-after-free vulnerability (CWE-416) exists in Foxit PDF Editor/Reader when processing malformed PDF form fields. Improper validation during traversal of field names may cause the software to access memory that has already been freed, resulting in an application crash. The vulnerability is local attack vector with low attack complexity, no privileges required, but requires user interaction. It impacts confidentiality, integrity, and availability with high impact ratings.
Potential Impact
Successful exploitation can cause the Foxit PDF Editor or Reader to crash, potentially leading to denial of service. The CVSS vector indicates high impact on confidentiality, integrity, and availability, but no known exploits are currently reported in the wild.
Mitigation Recommendations
No patch or official fix information is currently provided. Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, users should exercise caution when opening PDF files from untrusted sources.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- Foxit
- Date Reserved
- 2026-09-15T07:34:45.815Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6ab387ccf7a7c541067c1674
Added to database: 09/23/2026, 08:03:24 UTC
Last enriched: 09/23/2026, 08:18:14 UTC
Last updated: 09/23/2026, 18:44:30 UTC
Views: 6
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