CVE-2026-57249 in PDF Editor
Summary
by MITRE • 07/08/2026
After the application opened the PDF file, the script first reset the annotation status, then triggered the reset form event by additional action. During the re-entry process, the application access invalid objects and crashed.
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Analysis
by VulDB Data Team • 07/08/2026
This vulnerability represents a classic use-after-free condition that occurs during PDF document processing within a vulnerable application. The flaw manifests when the application handles PDF files containing specific annotation structures that trigger an improper sequence of events during document lifecycle management. When the script initializes the annotation status reset operation followed by the explicit triggering of a reset form event, it creates a temporal window where memory resources are deallocated but not properly invalidated before subsequent access attempts occur. The application's document processing engine fails to maintain proper object reference tracking during this transition phase, leading to access violations when attempting to interact with previously freed memory structures.
The technical implementation of this vulnerability aligns with CWE-416 Use After Free, which describes a condition where a program continues to use a pointer after the memory it points to has been freed. This particular variant demonstrates how complex document processing workflows can create race conditions between object lifecycle management and event handling mechanisms. The vulnerability specifically occurs in the annotation management subsystem where the application maintains internal state tracking for form elements and their associated annotations. When the reset form event is triggered, the system attempts to reinitialize various components while simultaneously cleaning up previous state information, creating a scenario where object references become invalid but are still accessed during the re-entry process.
The operational impact of this vulnerability extends beyond simple application crashes to potentially enable more serious security consequences. An attacker could exploit this condition by crafting malicious PDF files that specifically target the annotation reset sequence, causing the vulnerable application to crash repeatedly or potentially execute arbitrary code if proper memory corruption occurs. This type of vulnerability is particularly concerning in enterprise environments where PDF processing applications are frequently used for document exchange and form submission processes. The instability introduced by this flaw can disrupt normal business operations while also providing potential attack vectors for more sophisticated exploitation techniques.
Mitigation strategies should focus on implementing robust memory management practices within the application's PDF processing engine, including proper object lifecycle management, comprehensive pointer validation, and defensive programming techniques to prevent access to freed memory regions. The solution requires strengthening the annotation handling subsystem to ensure that all references are properly invalidated immediately upon resource deallocation, implementing proper synchronization mechanisms during multi-threaded document processing, and adding extensive input validation for PDF files before processing. Additionally, applying the principle of least privilege and implementing sandboxing techniques around PDF processing operations can limit the potential impact of exploitation attempts. This vulnerability also highlights the importance of adhering to secure coding practices such as those outlined in the OWASP Secure Coding Practices and ATT&CK framework's T1203 Exploitation for Client Execution, which emphasizes protecting against client-side exploitation through proper resource management and input sanitization techniques.