CVE-2026-91817: Out-of-bounds Read (CWE-125) in Foxit Software Inc. Foxit PDF Editor
CVE-2026-91817 is a heap-based out-of-bounds read vulnerability in Foxit PDF Editor and Reader. It arises from improper validation of string-deletion ranges in handling wide strings within embedded PDF JavaScript, causing an integer underflow. This flaw can lead to an out-of-bounds read and potentially crash the application. The vulnerability has a medium severity rating with a CVSS score of 6.1. No affected versions or patch information are provided, and no known exploits are reported in the wild.
AI Analysis
Technical Summary
This vulnerability involves a heap-based out-of-bounds read in Foxit PDF Editor/Reader triggered by insufficient validation of string-deletion ranges in wide strings used in embedded PDF JavaScript. The integer underflow condition allows reading memory outside the intended buffer, which can cause the application to crash. The CVSS 3.1 base score is 6.1, reflecting local attack vector, low complexity, no privileges required, user interaction required, and partial confidentiality impact with high availability impact.
Potential Impact
Successful exploitation can cause the application to crash due to out-of-bounds memory reads, resulting in denial of service. Confidentiality impact is low, and there is no integrity impact. No evidence of code execution or other impacts is provided.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, users should exercise caution when opening PDFs with embedded JavaScript from untrusted sources and consider disabling JavaScript execution within the PDF reader if possible.
CVE-2026-91817: Out-of-bounds Read (CWE-125) in Foxit Software Inc. Foxit PDF Editor
Description
CVE-2026-91817 is a heap-based out-of-bounds read vulnerability in Foxit PDF Editor and Reader. It arises from improper validation of string-deletion ranges in handling wide strings within embedded PDF JavaScript, causing an integer underflow. This flaw can lead to an out-of-bounds read and potentially crash the application. The vulnerability has a medium severity rating with a CVSS score of 6.1. No affected versions or patch information are provided, and no known exploits are reported in the wild.
CVSS v3.1
Score 6.1medium
Affected software
Foxit Software Inc.
Foxit PDF Editor
Foxit Software Inc.
Foxit PDF Reader
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability involves a heap-based out-of-bounds read in Foxit PDF Editor/Reader triggered by insufficient validation of string-deletion ranges in wide strings used in embedded PDF JavaScript. The integer underflow condition allows reading memory outside the intended buffer, which can cause the application to crash. The CVSS 3.1 base score is 6.1, reflecting local attack vector, low complexity, no privileges required, user interaction required, and partial confidentiality impact with high availability impact.
Potential Impact
Successful exploitation can cause the application to crash due to out-of-bounds memory reads, resulting in denial of service. Confidentiality impact is low, and there is no integrity impact. No evidence of code execution or other impacts is provided.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, users should exercise caution when opening PDFs with embedded JavaScript from untrusted sources and consider disabling JavaScript execution within the PDF reader if possible.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- Foxit
- Date Reserved
- 2026-09-15T07:34:45.816Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6ab387ccf7a7c541067c167d
Added to database: 09/23/2026, 08:03:24 UTC
Last enriched: 09/23/2026, 08:18:24 UTC
Last updated: 09/23/2026, 08:51:01 UTC
Views: 4
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