CVE-2026-13126 in PDF Editor
Summary
by MITRE • 07/08/2026
The embedded JavaScript in the PDF deleted the pages, making the object invalid. The application attempted to perform a write operation on the invalid pop-up annotations, resulting in the program crashing.
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Analysis
by VulDB Data Team • 07/08/2026
This vulnerability represents a critical memory corruption issue that manifests through maliciously crafted pdf documents containing embedded javascript code. The flaw occurs when pdf readers attempt to process javascript within document pages, specifically targeting annotation objects that have been modified or deleted during execution. When the application encounters an invalid pop-up annotation object that has been removed from its original context, it attempts to perform write operations on this corrupted data structure. This type of vulnerability aligns with CWE-125 out-of-bounds read conditions and CWE-787 out-of-bounds write vulnerabilities, where applications fail to properly validate object states before attempting memory operations. The crash results from the application's inability to handle invalid object references during annotation processing, creating a denial of service condition that can be exploited by attackers to disrupt pdf reader functionality.
The operational impact extends beyond simple application crashes as this vulnerability can be leveraged in targeted attacks against users of pdf reading applications. Attackers can craft malicious documents that trigger the memory corruption when victims open legitimate pdf files containing embedded javascript. This exploitation pattern follows ATT&CK technique T1204.002, where adversaries abuse legitimate user execution to run malicious code through document readers. The vulnerability demonstrates poor input validation and memory management practices within pdf processing engines, particularly in how they handle annotation objects during javascript execution contexts. When the application attempts to write to memory locations that no longer correspond to valid annotation structures, it typically results in segmentation faults or access violations that terminate the process.
Mitigation strategies should focus on implementing comprehensive input validation for all annotation objects within pdf documents before javascript execution begins. Security measures must include sandboxing mechanisms that isolate pdf processing environments from core system resources, preventing exploitation of memory corruption vulnerabilities. Organizations should deploy pdf reader updates that address the specific validation gaps in annotation handling and implement content filtering solutions that scan pdf documents for potentially malicious embedded javascript. The vulnerability also highlights the importance of proper resource cleanup and reference counting for annotation objects to prevent access to freed memory regions. Network security controls should monitor for suspicious pdf file patterns, while endpoint protection solutions should provide real-time analysis of document processing activities to detect anomalous behavior indicative of exploitation attempts.