Description

A maliciously crafted PDF file, when parsed through Autodesk Revit, can force an Out-of-Bounds Read vulnerability. A malicious actor can leverage this vulnerability to cause a crash, read sensitive data, or execute arbitrary code in the context of the current process.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "7.8",
  "pubDate": "2026-08-06T22:16:44.967Z",
  "pubdate": "2026-08-06T22:16:44.967Z",
  "executiveSummary": "This vulnerability is classified as an Out-of-Bounds Read vulnerability affecting Autodesk Revit when processing maliciously crafted PDF files. The flaw arises during the parsing phase of the PDF ingestion mechanism, where insufficient bounds checking allows memory access beyond the allocated buffer boundaries. Successful exploitation of this vulnerability can result in a denial of service via application crash, disclosure of sensitive memory contents, or potential arbitrary code execution within the security context of the currently running process.\nThe risk implication is critical, as a threat actor can craft a specialized PDF document and deliver it to a victim, enticing them to open or import the file within Autodesk Revit. The attack vector requires user interaction, specifically the parsing of the malicious file by the targeted software. In scenarios where arbitrary code execution is achieved, the adversary gains the privileges of the user running Autodesk Revit, potentially leading to system compromise, data exfiltration, or lateral movement within the enterprise environment. Mitigation relies on applying official vendor patches and adhering to strict file ingestion controls.",
  "technicalDetails": "The vulnerability exists within the PDF parsing component of Autodesk Revit due to improper validation of length parameters and input indices extracted from parsed file structures. Specifically, when the application reads structural elements or object streams from a PDF file, it fails to adequately verify that the designated read operations remain within the boundaries of the heap or stack-allocated buffers. This computational flaw precipitates an Out-of-Bounds Read condition.\nThe step-by-step attack flow begins when an adversary generates a maliciously crafted PDF file containing manipulated header data, xref tables, or stream objects designed to bypass standard validation checks. The attacker delivers this file to the target user through phishing campaigns, shared network drives, or malicious web distribution. Once the victim opens or imports the PDF file inside Autodesk Revit, the vulnerable parsing engine processes the malformed structures. During this phase, the application attempts to read memory offsets specified by the malicious input fields.\nBecause bounds checking is absent or bypassed, the read operation accesses adjacent memory regions outside the intended data structures. If the accessed memory contains sensitive data, such as heap metadata, cryptographic keys, or residual application secrets, the out-of-bounds read exposes this information to the processing routines, enabling data leakage. Furthermore, if the memory read destabilizes application execution or is combined with memory corruption primitives, it can provoke an access violation resulting in a crash (Denial of Service). In more advanced exploitation scenarios, chained vulnerabilities or predictable memory layouts could allow an attacker to leverage the primitive for arbitrary code execution within the process context of the application. The vulnerability impacts the user running the software, does not inherently require network exposure for initial file parsing, and relies on local file processing triggered by user interaction."
}