CVE-2025-2756 in Assimp
Summary
by MITRE • 03/25/2025
A vulnerability classified as critical has been found in Open Asset Import Library Assimp 5.4.3. This affects the function Assimp::AC3DImporter::ConvertObjectSection of the file code/AssetLib/AC/ACLoader.cpp of the component AC3D File Handler. The manipulation of the argument tmp leads to heap-based buffer overflow. It is possible to initiate the attack remotely. The exploit has been disclosed to the public and may be used.
Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.
Analysis
by VulDB Data Team • 03/07/2026
The vulnerability identified as CVE-2025-2756 represents a critical heap-based buffer overflow within the Open Asset Import Library Assimp version 5.4.3, specifically affecting the AC3D File Handler component. This flaw exists in the Assimp::AC3DImporter::ConvertObjectSection function located in code/AssetLib/AC/ACLoader.cpp, making it a significant security concern for any system that processes 3D asset files through this library. The vulnerability stems from improper input validation when handling the tmp argument, which allows maliciously crafted AC3D files to trigger memory corruption during file parsing operations. The heap-based nature of this overflow indicates that attackers can manipulate heap memory layout and potentially execute arbitrary code through carefully constructed input data.
The technical implementation of this vulnerability involves the manipulation of the tmp parameter within the AC3D file parsing logic, where insufficient bounds checking permits data to be written beyond allocated memory boundaries. This type of buffer overflow creates opportunities for attackers to overwrite adjacent memory locations, potentially leading to privilege escalation or code execution. The vulnerability's remote exploitability means that adversaries can trigger this condition through network-based file transfers without requiring local system access, significantly expanding the attack surface. The public disclosure of exploitation techniques further amplifies the risk, as malicious actors can readily implement automated attacks against vulnerable systems.
The operational impact of CVE-2025-2756 extends across various applications and platforms that rely on Assimp for 3D asset processing, including game engines, 3D modeling software, content management systems, and multimedia applications. Systems processing untrusted AC3D files become vulnerable to remote code execution, potentially allowing attackers to gain unauthorized access to affected systems. The vulnerability affects not only end-user applications but also server-side components that process 3D assets from external sources, creating risks for web applications, cloud services, and content delivery networks. Organizations utilizing Assimp for asset handling should consider this vulnerability as a high-priority threat requiring immediate attention and remediation.
Mitigation strategies for this vulnerability should include immediate deployment of the latest Assimp version containing the patched implementation of the AC3D file handler component. Security teams should implement network-based restrictions on AC3D file processing, particularly in environments where untrusted files are processed automatically. Input validation controls should be strengthened to reject malformed AC3D files before they reach the vulnerable parsing functions. The use of memory safety features such as address space layout randomization, stack canaries, and heap protection mechanisms can provide additional defense-in-depth measures. Organizations should also consider implementing sandboxing techniques for 3D asset processing and monitoring for suspicious file processing activities that could indicate exploitation attempts. This vulnerability aligns with CWE-121, heap-based buffer overflow, and maps to ATT&CK technique T1059 for remote code execution through compromised software components.