CVE-2026-10232: Assimp Use-After-Free in ASE Parser (CVSS 5.3)

Technical summary

The vulnerability stems from a use-after-free condition in the aiNode destructor within scene.cpp of Assimp's ASE file parser. CWE-416 (use-after-free) combined with CWE-119 (buffer overflow/memory safety issue) indicates improper memory management when parsing ASE file structures. An attacker can manipulate a malformed ASE file to cause the parser to reference memory that has already been freed, leading to undefined behavior. The local attack vector (AV:L) and low complexity (AC:L) indicate that any local user can trigger the condition without special setup. The vulnerability requires user-level privileges (PR:L), meaning system or root access is not necessary.

Business impact

Organizations relying on Assimp for 3D asset processing face localized integrity and confidentiality risks. In design workflows, content pipelines, or game development environments where ASE files are routinely imported, a compromised file could allow a local actor to exfiltrate project data, corrupt models, or disrupt operations. The impact is bounded to the single process and user context (Scope:Unchanged), so lateral movement or system-wide compromise is not a direct consequence. However, if the parsing occurs in a service with elevated privileges or within a batch processing pipeline, the risk escalates.

Affected systems

Assimp versions up to and including 6.0.4 are confirmed affected. The ASE File Parser component is the attack surface; any application embedding Assimp and parsing untrusted or user-supplied ASE files is in scope. This includes 3D modeling tools, game engines with Assimp integration, content pipeline servers, and rendering applications. Desktop workstations and servers that process external 3D assets are the primary targets. Verify your organization's Assimp version and deployment context against the vendor advisory to confirm exposure.

Exploitability

Public exploit code has been disclosed, lowering the barrier to weaponization. The attack requires only local system access and standard user privileges; no special credentials, physical access, or social engineering is necessary. The low complexity (AC:L) means no race conditions or timing tricks are required—a malformed ASE file is sufficient. However, the attacker must either have direct access to the system or be able to place a malicious ASE file where the application will parse it, such as a shared folder or upload endpoint. In air-gapped or restricted-access environments, risk is mitigated; in open collaborative spaces or web-accessible asset upload systems, risk is elevated.

Remediation

Upgrade Assimp to a patched version beyond 6.0.4 as soon as the vendor releases one. Verify the patch version against the official Assimp repository or release notes. In the interim, implement input validation and file source controls: restrict ASE file parsing to trusted sources, disable ASE import if not required, and run parsing operations in sandboxed or low-privilege contexts. Code review and static analysis should flag any use-after-free patterns in custom integrations.

Patch guidance

Monitor the Assimp GitHub repository (https://github.com/assimp/assimp) for security updates and version releases. When a patch is available, update your embedded Assimp library and rebuild dependent applications. Test the patched version in a staging environment before production deployment to ensure compatibility with your 3D asset pipeline. If your organization uses Assimp indirectly through a third-party application or engine (e.g., a game development framework), check that third-party's security advisories for a corresponding update timeline.

Detection guidance

Monitor process crashes and memory errors in applications that parse ASE files; use-after-free conditions often manifest as segmentation faults or heap corruption errors. Enable address sanitizer (ASan) or valgrind during development and testing to catch memory safety violations. In production, correlate ASE file uploads or imports with unexpected process terminations. Check application logs and system error messages for patterns matching the affected Assimp version and the scene.cpp component. If your asset pipeline logs file processing events, review them for rejected or malformed ASE files that may indicate exploitation attempts.

Why prioritize this

Although the CVSS score of 5.3 (MEDIUM) reflects the local attack requirement and limited scope, the combination of public exploit availability, ease of triggering (AC:L), and potential for data exfiltration or availability impact warrants timely attention. Organizations with collaborative workflows, web-accessible asset upload systems, or multi-user CAD/3D modeling environments should prioritize this higher. Conversely, air-gapped systems with restricted file access can defer but should not ignore the vulnerability.

Risk score, explained

The CVSS v3.1 score of 5.3 reflects: AV:L (local attack vector) limiting reach, AC:L (low complexity) enabling easy exploitation, PR:L (low privilege requirement), and UI:N (no user interaction needed). Confidentiality, Integrity, and Availability impacts are all marked Low (C:L, I:L, A:L), indicating limited scope per compromised process. However, this score does not account for public exploit availability or organizational context (e.g., a shared server processing user uploads), which may justify elevated internal risk ratings. Organizations handling sensitive 3D assets or running Assimp in multi-user environments should treat this as higher priority than the CVSS number alone suggests.

Frequently asked questions