CVE-2026-64198 in DASYLab
Summary
by MITRE • 09/04/2026
There is an out-of-bounds read vulnerability in DASYLab due to improper validation of user-supplied data. This results in a read a few bytes past the end of an allocated heap buffer during file handling. Successful exploitation requires an attacker to get a user to open a specially crafted .DSB file. This issue affects all versions before 2026.0.0.
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Analysis
by VulDB Data Team • 09/04/2026
The vulnerability identified in DASYLab represents a critical memory safety flaw rooted in improper validation of user-supplied data during the processing of specific input files. Specifically, this is an out-of-bounds read condition where the application fails to adequately verify the boundaries of allocated heap buffers before accessing them. When a user opens a specially crafted .DSB file, which serves as the primary vector for exploitation, the software attempts to parse and process data structures contained within that file. Due to insufficient checks on array indices or buffer lengths derived from the malicious input, the application proceeds to read memory locations that reside just beyond the allocated heap region. This behavior is characteristic of CWE-125, which defines out-of-bounds read vulnerabilities where software reads past the end of a buffer, potentially leading to information disclosure or further exploitation depending on the surrounding memory layout and operating system protections.
The operational impact of this vulnerability centers on the potential for unauthorized data exposure rather than immediate code execution, although the risk escalates significantly in certain contexts. By reading bytes from adjacent heap allocations, an attacker may be able to extract sensitive information stored in neighboring objects, such as pointers, cryptographic keys, or other application state data that happens to reside next to the target buffer in memory. This aligns with ATT&CK technique T1005, which involves Data from Local System Retrieval. While a simple out-of-bounds read does not inherently allow for arbitrary code execution like an out-of-bounds write might, it serves as a powerful information leak primitive that can be chained with other vulnerabilities or used to bypass security controls by revealing internal memory structures. The requirement for the attacker to trick a user into opening a crafted file indicates this is primarily a client-side attack vector relying on social engineering or malicious distribution channels rather than remote network exploitation without user interaction.
Mitigation strategies must address both immediate remediation and long-term defensive posture improvements. The most effective solution is to apply the vendor-provided patch that updates DASYLab to version 2026.0.0 or later, as this release explicitly resolves the validation logic errors responsible for the buffer boundary check failure. In environments where immediate patching is not feasible due to operational constraints, administrators should implement strict application whitelisting policies to prevent unauthorized execution of unpatched versions and enforce file extension filtering to block .DSB files from users who do not require them. Additionally, enabling advanced memory protection features such as Data Execution Prevention (DEP) and Address Space Layout Randomization (ASLR) can mitigate the impact by making it more difficult for attackers to predict memory layouts or execute code derived from leaked information. Security awareness training should also be conducted to educate users on recognizing suspicious file sources, thereby reducing the likelihood of successful social engineering attacks that lead to the opening of maliciously crafted inputs.