CVE-2026-91793: CWE-416 Use after free in Foxit Software Inc. Foxit PDF Editor
When opening a specially crafted PDF, Foxit PDF Editor/Reader executes scripts that modify annotation rich-text attributes containing malformed font data. During subsequent annotation appearance reconstruction, it accesses an object after it has been released, resulting in a use-after-free condition and an application crash.
AI Analysis
Technical Summary
This vulnerability involves a use-after-free condition in Foxit PDF Editor/Reader. When a specially crafted PDF is opened, scripts modify annotation rich-text attributes containing malformed font data. During the process of reconstructing annotation appearance, the software accesses an object that has already been freed, resulting in a use-after-free flaw that causes the application to crash. The CVSS 3.1 base score is 7.8, indicating high severity with high impact on confidentiality, integrity, and availability. The attack vector is local with low complexity, no privileges required, but user interaction is needed.
Potential Impact
Successful exploitation can lead to application crashes and potentially allow an attacker to execute arbitrary code or cause denial of service. The vulnerability affects confidentiality, integrity, and availability with high impact as per the CVSS score.
Mitigation Recommendations
No patch or official fix information is currently available. Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is released, users should exercise caution when opening PDF files from untrusted sources and consider disabling script execution in Foxit PDF Editor/Reader if possible.
CVE-2026-91793: CWE-416 Use after free in Foxit Software Inc. Foxit PDF Editor
Description
When opening a specially crafted PDF, Foxit PDF Editor/Reader executes scripts that modify annotation rich-text attributes containing malformed font data. During subsequent annotation appearance reconstruction, it accesses an object after it has been released, resulting in a use-after-free condition and 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
This vulnerability involves a use-after-free condition in Foxit PDF Editor/Reader. When a specially crafted PDF is opened, scripts modify annotation rich-text attributes containing malformed font data. During the process of reconstructing annotation appearance, the software accesses an object that has already been freed, resulting in a use-after-free flaw that causes the application to crash. The CVSS 3.1 base score is 7.8, indicating high severity with high impact on confidentiality, integrity, and availability. The attack vector is local with low complexity, no privileges required, but user interaction is needed.
Potential Impact
Successful exploitation can lead to application crashes and potentially allow an attacker to execute arbitrary code or cause denial of service. The vulnerability affects confidentiality, integrity, and availability with high impact as per the CVSS score.
Mitigation Recommendations
No patch or official fix information is currently available. Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is released, users should exercise caution when opening PDF files from untrusted sources and consider disabling script execution in Foxit PDF Editor/Reader if possible.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- Foxit
- Date Reserved
- 2026-09-15T07:34:40.287Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6ab387c8f7a7c541067c1663
Added to database: 09/23/2026, 08:03:20 UTC
Last enriched: 09/23/2026, 08:32:37 UTC
Last updated: 09/23/2026, 22:34:31 UTC
Views: 9
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
External Links
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.