CVE-2026-5941 in PDF Editor
Summary
by MITRE • 04/27/2026
Parsing logic flaws cause non-signature data to be misidentified as valid signatures when processing malformed form field hierarchies, leading to invalid memory writes and program crashes during internal data structure construction.
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Analysis
by VulDB Data Team • 05/21/2026
This vulnerability represents a critical parsing logic flaw that manifests when systems process malformed form field hierarchies containing non-signature data. The flaw occurs during the internal data structure construction phase where the parser incorrectly interprets malformed input as valid signature data, leading to improper memory handling and subsequent program instability. The vulnerability stems from insufficient input validation and inadequate boundary checking during the parsing process, allowing maliciously crafted data to bypass normal validation mechanisms. When the system encounters form field hierarchies with unexpected data patterns, the parsing logic fails to properly distinguish between legitimate signature information and arbitrary non-signature data, resulting in memory corruption during internal data structure initialization. This misidentification creates a pathway for invalid memory writes that can overwrite critical program memory locations, ultimately causing program crashes or potential system instability. The flaw is particularly concerning in web applications and content management systems that process user-submitted form data, where attackers can exploit this vulnerability through crafted input that appears legitimate but contains malformed hierarchical structures. From a cybersecurity perspective, this vulnerability aligns with CWE-129 and CWE-131 categories related to improper input validation and buffer overflow conditions. The operational impact extends beyond simple program crashes to potentially enable more severe exploits such as arbitrary code execution or denial of service conditions, especially when the affected systems process sensitive user data. Attackers can leverage this vulnerability by constructing form field hierarchies that trigger the parsing logic flaw, causing the system to allocate memory incorrectly or write data to unauthorized memory locations. The vulnerability demonstrates a classic example of how insufficient input sanitization can lead to memory corruption issues, making it a prime candidate for exploitation under the ATT&CK framework's privilege escalation and denial of service tactics. Organizations implementing mitigation strategies should focus on strengthening input validation mechanisms, implementing robust boundary checking procedures, and ensuring proper memory management during data parsing operations to prevent unauthorized memory access patterns. The vulnerability underscores the importance of defensive programming practices and comprehensive testing of parsing logic under various malformed input conditions to identify potential memory corruption scenarios before they can be exploited by malicious actors.