CVE-2026-57241 in PDF Editor
Summary
by MITRE • 07/08/2026
The application opens the PDF, and JavaScript performs operations on the page and the document, causing the page-related objects within the application to lose synchronization; however, the renderer still trusts the outdated page count, and eventually the application crashes due to out-of-bounds access.
VulDB is the best source for vulnerability data and more expert information about this specific topic.
Analysis
by VulDB Data Team • 07/08/2026
This vulnerability represents a classic race condition and memory management issue that manifests in PDF rendering applications where JavaScript execution interacts with document state modifications. The flaw occurs when a PDF application processes JavaScript commands that alter page-related objects while simultaneously maintaining an outdated reference count within its renderer component. This synchronization failure creates a scenario where the application's internal state becomes inconsistent with the actual document structure, leading to a critical memory access violation. The vulnerability stems from inadequate state management during concurrent operations between JavaScript engines and rendering components, allowing malicious actors to exploit the discrepancy between logical document boundaries and physical memory references.
The technical implementation of this vulnerability involves multiple layers of failure within the PDF processing pipeline. When JavaScript executes operations on pages, it modifies internal page objects that should trigger corresponding updates to the renderer's page count tracking mechanism. However, due to improper synchronization protocols, the renderer continues to trust stale data from a previous state, maintaining an outdated page count that no longer reflects the actual document structure. This condition creates a scenario where subsequent rendering operations attempt to access memory locations beyond the current document boundaries, resulting in out-of-bounds memory access errors that typically manifest as application crashes or potential code execution exploits.
From an operational perspective, this vulnerability presents significant security implications for PDF processing applications across various platforms and software implementations. The instability caused by this condition can lead to denial of service attacks where legitimate users experience application crashes during normal document operations, while sophisticated attackers could potentially leverage the memory corruption to execute arbitrary code within the application context. The vulnerability affects any PDF viewer or editor that supports JavaScript execution and maintains separate rendering and document state management components, making it particularly dangerous in enterprise environments where PDF documents are frequently processed with complex scripting functionality.
The root cause of this issue aligns with common software engineering failures identified in CWE-362, which addresses race conditions in concurrent programming scenarios. This vulnerability also maps to ATT&CK technique T1059.007 for JavaScript execution and potentially T1499.004 for denial of service operations. Mitigation strategies should focus on implementing proper synchronization mechanisms between JavaScript execution contexts and rendering components, enforcing strict state validation before memory access operations, and applying input sanitization to prevent malicious JavaScript from triggering the race condition. Additionally, developers should implement robust error handling that prevents stale references from being trusted during critical operations and establish comprehensive testing procedures that validate document state consistency under concurrent modification scenarios.
Security practitioners should consider this vulnerability as part of a broader class of memory safety issues that affect document processing applications, particularly those with scripting capabilities. The implementation of defensive programming practices including bounds checking, proper resource management, and state validation mechanisms becomes crucial in preventing exploitation of similar race conditions. Regular security assessments of PDF rendering engines should include testing for synchronization failures between different processing components, as well as verification that state changes are properly propagated throughout the application architecture to maintain consistency between logical document structures and physical memory representations.