CVE-2026-57254 in PDF Editor
Summary
by MITRE • 07/08/2026
There is an abnormal annotation within the PDF that is referenced by other objects. When the application parses the PDF, it fails to perform proper type checking, ultimately causing the application to crash.
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Analysis
by VulDB Data Team • 07/08/2026
This vulnerability represents a classic type confusion flaw that occurs during PDF parsing operations when malformed annotations are encountered. The issue manifests when an application processes a pdf document containing an annotation object that references other objects within the document structure but lacks proper type validation during the parsing phase. This specific weakness falls under the broader category of improper type checking vulnerabilities, which are commonly classified as cwe-460 in the common weakness enumeration catalog. The absence of robust type verification during object reference resolution creates a condition where the application attempts to process annotation data using incorrect assumptions about its data type or structure. When the pdf parser encounters this malformed annotation, it fails to properly validate the referenced objects before attempting to access their properties or methods, leading to a denial of service condition through application crash.
The operational impact of this vulnerability extends beyond simple service disruption as it can potentially be exploited by malicious actors to cause system instability or trigger more severe security implications. Attackers could craft specially formatted pdf documents containing such malformed annotations to induce crashes in applications that process pdf files, effectively creating a denial of service vector. This type of vulnerability is particularly concerning in environments where pdf processing is automated or occurs without user intervention, as it could enable automated attacks against servers or applications handling document workflows. The weakness demonstrates characteristics consistent with attack techniques described in the attack tree framework where an adversary attempts to manipulate input data structures to cause unexpected behavior in parsing routines.
Security mitigations for this vulnerability should focus on implementing comprehensive type validation mechanisms within pdf parsing libraries and applications. Developers must ensure that all object references are properly validated before any processing occurs, with particular attention to annotation objects and their cross-references to other document elements. This includes implementing strict schema validation checks and robust error handling procedures that can gracefully manage malformed input data without crashing the entire application. The implementation of defensive programming practices such as input sanitization and proper exception handling should be enforced throughout pdf parsing components. Additionally, applications should employ sandboxing techniques when processing untrusted pdf documents to contain potential crashes or other malicious behavior. Regular updates to pdf libraries and parsers are essential to address known vulnerabilities and maintain security posture against evolving attack vectors targeting document processing systems.