CVE-2026-57242 in PDF Editor
Summary
by MITRE • 07/08/2026
The application opens the PDF, and JavaScript modifies the form. However, the related objects on the page lack complete lifecycle management and null value validation; when the page state changes, the application continuously dereferences invalid objects, eventually leading to a crash.
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Analysis
by VulDB Data Team • 07/08/2026
This vulnerability represents a classic heap corruption issue stemming from inadequate object lifecycle management within PDF processing applications. The flaw manifests when JavaScript executes within a PDF context and modifies form elements, creating a scenario where related page objects are not properly tracked or validated throughout their existence. According to CWE-476, this constitutes a null pointer dereference vulnerability that occurs when the application fails to validate object references before accessing them. The absence of proper null value validation creates an exploitable condition where memory access violations can occur during page state transitions.
The technical implementation flaw lies in the application's failure to maintain consistent object reference tracking and cleanup mechanisms during dynamic form modifications. When JavaScript modifies form fields, the underlying objects that represent these elements may not be properly invalidated or destroyed when their associated page state changes. This creates a scenario where references to previously allocated memory locations become stale or invalid while the application continues to attempt dereferencing them. The continuous dereferencing of invalid objects leads to memory corruption and ultimately application instability.
From an operational perspective, this vulnerability poses significant risks to PDF rendering applications that process untrusted documents. Attackers can exploit this weakness by crafting malicious PDF files containing JavaScript code that modifies form elements in a controlled manner, triggering the object lifecycle management failure. The crash resulting from this exploitation can lead to denial of service conditions or potentially enable more sophisticated attacks if the memory corruption can be leveraged for code execution. This vulnerability aligns with ATT&CK technique T1203, which involves leveraging application vulnerabilities for privilege escalation or system compromise.
The mitigation strategies should focus on implementing robust object lifecycle management protocols that enforce proper reference validation and cleanup mechanisms. Applications must validate all object references before dereferencing them, particularly during page state transitions involving JavaScript execution. Implementing memory safety patterns such as smart pointers or reference counting can help prevent invalid object access. Additionally, comprehensive input sanitization of JavaScript code within PDF documents and strict validation of form element modifications will reduce the likelihood of triggering this vulnerability. Regular security testing including fuzzing of PDF processing components and monitoring for anomalous memory access patterns should be part of ongoing defensive measures to identify similar issues before they can be exploited in production environments.