CVE-2026-57254: Foxit PDF Editor DoS Vulnerability

CVE-2026-57254 Overview

CVE-2026-57254 is a type confusion vulnerability [CWE-843] affecting Foxit PDF Editor and Foxit PDF Reader on Microsoft Windows. The flaw exists in the PDF parser, which fails to perform proper type checking when handling an abnormal annotation object referenced by other objects. Processing a crafted PDF file triggers the condition and causes the application to crash. The vulnerability requires local file processing and user interaction, meaning a victim must open a malicious document. Successful exploitation can lead to high impact on confidentiality, integrity, and availability of the affected host.

Critical Impact
A crafted PDF containing an abnormal annotation referenced by other objects can bypass type validation in Foxit PDF products, causing application crash and potential code execution in the context of the user.

Affected Products

Foxit PDF Editor on Microsoft Windows
Foxit PDF Reader on Microsoft Windows
Microsoft Windows platforms hosting affected Foxit installations

Discovery Timeline

2026-07-08 - CVE-2026-57254 published to NVD
2026-07-09 - Last updated in NVD database

Technical Details for CVE-2026-57254

Vulnerability Analysis

The vulnerability is a type confusion issue classified under [CWE-843] (Access of Resource Using Incompatible Type). Foxit PDF Editor and Reader parse PDF documents that contain interactive annotations, which are stored as PDF objects and can be referenced by other objects within the document structure. When the parser encounters an annotation object of an unexpected or malformed type, it dereferences the object as if it were the expected type. This confusion between the actual object type and the assumed type results in memory being interpreted incorrectly, leading to an application crash. Attackers who control the memory layout referenced by the type-confused object may extend the impact beyond denial of service to arbitrary code execution in the user context.

Root Cause

The root cause is missing or insufficient type checking during PDF annotation parsing. The application accepts an annotation object whose type does not match the expected structure but continues to process it through code paths designed for the assumed type. Because other objects reference this abnormal annotation, the parser dereferences it during downstream operations, compounding the impact of the initial validation failure.

Attack Vector

Exploitation requires an attacker to deliver a crafted PDF file to a victim who opens it with a vulnerable Foxit product. Common delivery methods include email attachments, drive-by downloads, and file-sharing platforms. The attack vector is local with required user interaction, and no privileges are needed on the target system before exploitation. The vulnerability description in the Foxit security bulletin confirms application crash as the observed impact.

No public proof-of-concept code is available. For technical specifics, refer to the Foxit Security Bulletin.

Detection Methods for CVE-2026-57254

Indicators of Compromise

Unexpected crashes of FoxitPDFEditor.exe or FoxitPDFReader.exe following the opening of a PDF document
Windows Error Reporting (WER) entries or .dmp crash dumps generated by Foxit processes
PDF files sourced from untrusted senders containing unusual annotation dictionaries or cross-references

Detection Strategies

Monitor endpoints for abnormal termination of Foxit processes correlated with PDF file access events
Inspect PDF files at email and web gateways for malformed annotation objects and inconsistent object type references
Correlate process crash telemetry with parent process and file open events to identify malicious document delivery

Monitoring Recommendations

Enable full crash dump collection for Foxit processes to support forensic analysis after suspected exploitation
Track file provenance metadata (Mark-of-the-Web) on PDFs opened by users to prioritize investigation of externally sourced files
Alert on Foxit processes spawning unexpected child processes such as cmd.exe, powershell.exe, or scripting hosts

How to Mitigate CVE-2026-57254

Immediate Actions Required

Apply the latest security updates from Foxit as listed in the Foxit Security Bulletin
Restrict opening of PDF files received from untrusted sources until affected endpoints are patched
Enable Safe Reading Mode in Foxit PDF Editor and Reader to limit execution of potentially unsafe content

Patch Information

Foxit has published a security advisory addressing this vulnerability. Administrators should consult the Foxit Security Bulletin for the specific fixed versions of Foxit PDF Editor and Foxit PDF Reader and deploy the updates across all Windows endpoints running the affected products.

Workarounds

Disable JavaScript and disable the loading of external content within Foxit PDF Editor and Reader preferences to reduce attack surface
Configure email and web filtering solutions to inspect and sandbox PDF attachments before delivery to end users
Use application allow-listing to prevent Foxit processes from launching unauthorized child processes

bash

# Example: Query installed Foxit versions on Windows endpoints via PowerShell
Get-ItemProperty HKLM:\Software\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall\* |
  Where-Object { $_.DisplayName -like "*Foxit PDF*" } |
  Select-Object DisplayName, DisplayVersion, Publisher