CVE-2026-57260: Foxit PDF Editor DOS Vulnerability

CVE-2026-57260 Overview

CVE-2026-57260 is an out-of-bounds write vulnerability [CWE-787] in Foxit PDF Editor and Foxit PDF Reader. The flaw occurs when the application parses a PDF file containing a malformed Unity 3D object. During parsing, the application incorrectly resolves a portion of the abnormal object as a pointer and dereferences it as a valid memory address. This results in application crash and potential arbitrary code execution in the context of the current user.

Critical Impact
Attackers who convince a user to open a crafted PDF can trigger memory corruption leading to high-impact confidentiality, integrity, and availability loss on affected Windows and macOS hosts.

Affected Products

Foxit PDF Editor (see vendor bulletin for affected versions)
Foxit PDF Reader (see vendor bulletin for affected versions)
Microsoft Windows and Apple macOS host platforms

Discovery Timeline

2026-07-08 - CVE-2026-57260 published to NVD
2026-07-09 - Last updated in NVD database

Technical Details for CVE-2026-57260

Vulnerability Analysis

The vulnerability resides in the PDF parsing engine used by Foxit PDF Editor and Foxit PDF Reader when handling embedded Unity 3D objects. Foxit supports 3D annotations inside PDF documents, and Unity assets are one of the payload formats the parser accepts. When the application encounters a Unity 3D object with malformed structural fields, the parser misinterprets attacker-controlled bytes as a memory pointer. The parser then writes to that address without validating that it points to a legitimately allocated buffer.

The CWE-787 classification confirms the write occurs outside the bounds of the intended buffer. Because the pointer value is derived from file content, an attacker can influence which memory region is corrupted. This creates a path from a crash primitive to arbitrary code execution when combined with heap grooming and control-flow hijacking techniques.

Root Cause

The root cause is missing validation of embedded object fields before they are treated as memory references. The parser assumes structural integrity of the Unity 3D object rather than enforcing bounds and type checks on every dereferenced value.

Attack Vector

Exploitation requires local user interaction. The victim must open a weaponized PDF in a vulnerable Foxit build. Delivery channels include email attachments, drive-by downloads, and shared document repositories. No network access or elevated privileges are needed on the target.

No verified public exploit code is available for CVE-2026-57260. Consult the Foxit Security Bulletins for technical details.

Detection Methods for CVE-2026-57260

Indicators of Compromise

Unexpected crashes of FoxitPDFEditor.exe or FoxitPDFReader.exe with access violation exceptions referencing 3D or Unity parsing modules
PDF files containing 3D annotations with Unity asset streams delivered from untrusted senders
Child processes spawned by Foxit executables such as cmd.exe, powershell.exe, or rundll32.exe shortly after a PDF is opened

Detection Strategies

Hunt for Foxit process crashes correlated with recently opened PDF documents in Windows Error Reporting and macOS crash logs
Inspect PDF files for /3D annotation objects that reference Unity payloads, particularly from external or low-reputation sources
Alert on Foxit reader or editor processes performing unusual file writes, network connections, or module loads outside their normal baseline

Monitoring Recommendations

Enable command-line and process creation logging on endpoints running Foxit products
Forward endpoint telemetry to a centralized analytics platform to correlate PDF opens with subsequent suspicious child process activity
Track vendor advisories at the Foxit security bulletins page for updated affected version ranges

How to Mitigate CVE-2026-57260

Immediate Actions Required

Update Foxit PDF Editor and Foxit PDF Reader to the latest version released by the vendor addressing CVE-2026-57260
Restrict opening of PDF files originating from untrusted email senders and external file shares
Enable operating system exploit mitigations such as Data Execution Prevention (DEP) and Address Space Layout Randomization (ASLR) for Foxit executables

Patch Information

Refer to the Foxit Security Bulletins for the fixed version numbers and download links. Apply the vendor patch across all Windows and macOS endpoints running Foxit PDF Editor or Reader.

Workarounds

Disable 3D content rendering in Foxit preferences until patches are deployed
Configure application allowlisting to prevent Foxit processes from spawning shell interpreters or scripting hosts
Use group policy or configuration management to enforce Protected View or equivalent sandboxing for documents from the internet zone

bash

# Example: block Foxit from spawning common LOLBins via Windows Defender ASR rules
Set-MpPreference -AttackSurfaceReductionRules_Ids d4f940ab-401b-4efc-aadc-ad5f3c50688a `
                 -AttackSurfaceReductionRules_Actions Enabled