CVE-2026-57252 in PDF Editor
Summary
by MITRE • 07/08/2026
When the application opens a PDF file, during the process of JavaScript deleting pages and removing attachment annotations, it will cause the attachment panel to continue accessing invalid pointers, eventually leading to the application crashing.
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Analysis
by VulDB Data Team • 07/08/2026
This vulnerability represents a classic use-after-free condition that occurs within PDF processing applications when handling JavaScript operations on document elements. The flaw manifests specifically during the sequence where the application attempts to delete pages and remove attachment annotations from a pdf document. When these operations are performed in rapid succession or under certain conditions, the application's internal data structures fail to properly invalidate references to deleted objects, creating a scenario where the attachment panel continues to reference memory locations that have already been freed or reallocated.
The technical implementation of this vulnerability stems from inadequate memory management within the pdf rendering engine's javascript interpreter. When pages are deleted and attachment annotations removed, the application maintains internal pointers or references to these elements in its attachment panel display system. These references become stale or invalid as the underlying objects are destroyed during the deletion process, yet the panel continues to attempt access to these freed memory locations. This behavior directly aligns with common software security vulnerabilities categorized under CWE-416, which addresses use-after-free conditions where program code continues to reference memory after it has been freed by the system.
The operational impact of this vulnerability extends beyond simple application instability, as it creates a potential vector for remote code execution in vulnerable environments. Attackers could craft malicious pdf documents containing specially constructed javascript that triggers the specific sequence of page deletion and annotation removal that leads to invalid pointer access. The resulting application crash may be exploitable through controlled memory corruption, potentially allowing adversaries to execute arbitrary code with the privileges of the affected application. This vulnerability follows patterns commonly observed in exploit development frameworks like those referenced in the attack mitigation techniques documented under the ATT&CK framework's T1059.007 sub-technique for javascript-based attacks targeting document processing applications.
Mitigation strategies should focus on implementing robust memory management practices including proper reference counting mechanisms, delayed deallocation of objects, and comprehensive input validation for pdf documents containing javascript. Application developers should ensure that attachment panel systems properly invalidate all references when underlying objects are deleted, implement bounds checking for memory access operations, and consider using modern memory-safe programming languages or additional runtime protections. Additionally, organizations should deploy pdf processing applications with strict sandboxing measures and regularly update their software to address known vulnerabilities in pdf rendering engines. Security teams should monitor for unusual application behavior patterns that may indicate exploitation attempts, particularly around document processing activities that involve javascript execution and object manipulation within pdf files.