CVE-2026-39020 in Wings3D
Summary
by MITRE • 09/09/2026
An issue in WIngs3D v.2.4.1 allows a local attacker to cause a denial of service via a crafted Wavefront OBJ file
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Analysis
by VulDB Data Team • 09/09/2026
The vulnerability identified in Wings3D version 2.4.1 represents a significant risk for users who process external 3D model files, specifically those formatted as Wavefront OBJ. This software is widely used by digital artists and designers for creating polygonal models, making the integrity of its file parsing mechanisms critical to maintaining system stability. The flaw resides within the application's handling of specific structural elements or data sequences embedded within a maliciously crafted OBJ file. When an attacker provides such a file to a victim, typically through social engineering or by placing it in a monitored directory that Wings3D automatically scans, the software attempts to parse and render the content without adequate validation checks against resource exhaustion conditions.
From a technical perspective, this vulnerability is classified as a denial of service condition resulting from improper input validation leading to resource consumption issues. The attacker crafts an OBJ file containing specific geometric data or metadata sequences that trigger an infinite loop, excessive memory allocation, or stack overflow within the Wings3D rendering engine. Unlike remote code execution vulnerabilities which allow for arbitrary command execution on the target system, this flaw is strictly limited in scope to disrupting the availability of the application and potentially destabilizing the host operating environment if the crash propagates beyond the process boundary. The lack of safeguards against malformed or excessively complex geometry allows a single file to consume disproportionate amounts of CPU cycles or memory resources until the application becomes unresponsive or terminates unexpectedly.
The operational impact of this vulnerability is primarily centered on service availability and user productivity. For individual artists, encountering such a crash results in immediate loss of unsaved work if auto-save features are not configured correctly, leading to frustration and potential data loss. In professional environments where Wings3D might be part of a larger pipeline involving automated batch processing or shared workstations, the impact is amplified. A denial of service condition can halt production workflows, require system reboots in severe cases due to kernel-level instability caused by memory corruption, and necessitate IT intervention to restore normal operations. Furthermore, if this vulnerability were chained with other local privilege escalation flaws within the operating system or related libraries, it could potentially serve as a foothold for more sophisticated attacks, although the primary vector remains localized denial of service.
This issue aligns closely with Common Weakness Enumeration (CWE) category CWE-400, which describes uncontrolled resource consumption, and specifically relates to scenarios where input validation fails to limit the complexity or size of processed data structures. In terms of the MITRE ATT&CK framework, this behavior is consistent with techniques used in local denial-of-service attacks, often categorized under disruption tactics aimed at reducing the availability of targeted resources. The attack vector requires physical access or network-level proximity sufficient to deliver the crafted file to the victim's machine, classifying it as a Local Attack Vector rather than Remote. This distinction underscores that while the impact is severe for the local user, it does not pose an immediate threat to external networks unless combined with other vulnerabilities like weak authentication mechanisms or insecure default configurations in shared environments.
Mitigation strategies should focus on both technical controls and operational procedures. Users are strongly advised to upgrade Wings3D to a patched version that implements strict bounds checking and resource limits during the parsing of OBJ files. Until an official patch is available, users should exercise extreme caution when opening 3D models from untrusted sources or generated by unknown third parties. Implementing sandboxed environments for rendering tasks can isolate potential crashes from the main operating system, preserving overall stability. Additionally, organizations deploying Wings3D in production pipelines should integrate file validation tools that inspect incoming assets for anomalies before they reach the application layer. Regular updates and adherence to secure coding practices regarding input sanitization are essential defenses against such resource exhaustion vulnerabilities.