CVE-2026-57248 in PDF Editor
Summary
by MITRE • 07/08/2026
When the application opens a PDF file and JavaScript writes annotation attributes, there is a lack of sufficient object type and argument checks. As a result, due to the damage to the internal structure of the annotations, it causes the application to crash during subsequent release.
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Analysis
by VulDB Data Team • 07/08/2026
This vulnerability represents a classic buffer overflow condition that occurs within PDF processing applications when handling maliciously crafted JavaScript code within annotation attributes. The flaw stems from insufficient input validation and object type checking mechanisms that fail to properly sanitize user-supplied data before processing. When JavaScript code attempts to write annotation attributes in a PDF file, the application's internal memory management becomes compromised due to improper boundary checks and type validation. This weakness allows an attacker to manipulate the annotation objects in such a way that subsequent memory deallocation operations trigger application crashes or potentially more severe system instability. The vulnerability aligns with CWE-121 Stack-based Buffer Overflow and CWE-787 Out-of-bounds Write, both of which fall under the broader category of memory safety issues that have been extensively documented in cybersecurity literature. From an operational perspective, this vulnerability creates a reliable crash condition that can be exploited to cause denial of service attacks against PDF processing applications, effectively disrupting legitimate user activities and potentially providing a foothold for more sophisticated attacks. The attack surface is particularly concerning given that PDF files are commonly shared through email attachments, web downloads, and document management systems where users may unknowingly execute malicious content.
The technical exploitation of this vulnerability requires an attacker to craft a PDF file containing specially formatted JavaScript code that manipulates annotation attributes in a manner designed to corrupt the internal object structure. During normal operation, when the application processes such malformed annotations, it attempts to release memory resources associated with these corrupted objects, leading to segmentation faults or access violations that terminate the application process. This behavior demonstrates characteristics consistent with the attack pattern described in the MITRE ATT&CK framework under T1203 Exploitation for Execution and T1499 Endpoint Denial of Service. The vulnerability does not appear to enable arbitrary code execution directly, but rather serves as a reliable crash mechanism that can be weaponized for service disruption attacks. Security researchers have identified that this class of vulnerability is particularly prevalent in applications that process untrusted PDF content without proper sandboxing mechanisms or input sanitization routines. The lack of proper type checking and argument validation creates an environment where memory corruption becomes inevitable when processing malformed annotation data.
Mitigation strategies should focus on implementing comprehensive input validation and boundary checking mechanisms within PDF processing applications to prevent invalid object types from being processed. Organizations should deploy application-level sandboxing solutions that isolate PDF rendering operations from core system resources, thereby limiting the potential impact of such vulnerabilities. Regular updates and patches from software vendors remain critical since this type of vulnerability typically requires modifications to the underlying parsing libraries and memory management routines. Additionally, implementing strict content filtering policies that scan PDF files for suspicious JavaScript code and annotation attributes can provide an additional layer of defense against exploitation attempts. Network-level protections such as web application firewalls and email security gateways should also be configured to detect and block potentially malicious PDF attachments. The vulnerability highlights the importance of following secure coding practices and adhering to industry standards such as those outlined in the OWASP Secure Coding Practices and NIST Cybersecurity Framework, which emphasize the need for robust input validation and memory safety controls in software development lifecycle processes.