Description

There is an out-of-bounds write vulnerability in DASYLab due to lack of proper validation of user-supplied data. 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.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "7.8",
  "pubDate": "2026-09-03T22:18:09.293Z",
  "pubdate": "2026-09-03T22:18:09.293Z",
  "executiveSummary": "An out-of-bounds write vulnerability exists in DASYLab, impacting all versions prior to 2026.0.0. This memory corruption vulnerability arises due to insufficient validation of user-supplied data during the processing of .DSB files.\nThe vulnerability poses a significant risk to system integrity and confidentiality, as it allows for arbitrary memory modification. An attacker can leverage this flaw to execute arbitrary code within the context of the DASYLab application. Successful exploitation requires a social engineering component, necessitating that an attacker convinces a user to open a specially crafted .DSB file.\nGiven the nature of the vulnerability, exploitation could lead to full application compromise or potentially elevated system privileges, depending on the environment and user permissions. Organizations utilizing DASYLab are advised to restrict the opening of untrusted files and prioritize updates to version 2026.0.0 or later as soon as they become available.",
  "technicalDetails": "The identified vulnerability is a critical memory corruption flaw classified as an out-of-bounds write. This issue originates within the parsing logic of DASYLab when handling .DSB (DASYLab Worksheet) files. Specifically, the application fails to perform rigorous boundary checks on user-supplied data embedded within the file structure before performing write operations into allocated memory buffers.\nThe root cause is an improper validation of input data lengths or offsets. When a specially crafted .DSB file is processed, the malicious payload provides metadata or structural information that causes the internal parsing functions to calculate an incorrect memory address. Consequently, the application performs a write operation outside the boundaries of the intended buffer. This overwrite can corrupt adjacent memory regions, potentially altering critical data structures, function pointers, or return addresses on the stack.\nThe attack flow begins with the delivery of a malicious .DSB file to the target user via phishing, email attachment, or unauthorized file shares. Upon the user opening the file within DASYLab, the application’s file-parsing component initializes the vulnerable routine. The parser reads the crafted data, fails to validate the bounds, and proceeds to write data to an unauthorized memory location. If successfully weaponized, this memory corruption allows an attacker to control the execution flow of the application. By overwriting function pointers or returning values, an attacker can redirect the program execution to attacker-controlled shellcode injected into memory.\nThe exploitation process does not require network exposure; it is entirely triggered locally by the application's interaction with the malicious file. Authentication is not required for the initial execution, as the vulnerability is triggered by user action in the local software environment. However, the resulting impact is constrained by the privilege level of the user running DASYLab. If the application is executed with administrative privileges, the attacker could gain extensive control over the host system. Post-exploitation impact ranges from application-level crashes resulting in a Denial of Service (DoS) to complete system compromise via Arbitrary Code Execution (ACE), allowing for exfiltration of sensitive design data, installation of persistent backdoors, or lateral movement within the network."
}