CVE-2026-10232: Assimp Use-After-Free Vulnerability

CVE-2026-10232 Overview

CVE-2026-10232 is a use-after-free vulnerability in the Open Asset Import Library (Assimp) versions up to 6.0.4. The flaw resides in the aiNode::~aiNode destructor within scene.cpp, triggered through the ASE file parser component. An attacker with local access and low privileges can supply a crafted ASE 3D model file that causes the parser to dereference freed memory during scene cleanup. The Assimp project has tagged the reported issue as a bug. A public proof-of-concept is available, lowering the barrier for opportunistic exploitation against applications that embed Assimp for 3D asset processing.

Critical Impact
Local attackers can trigger memory corruption in any application embedding Assimp ≤ 6.0.4 by supplying a malicious ASE model file, potentially impacting confidentiality, integrity, and availability of the host process.

Affected Products

Open Asset Import Library (Assimp) versions through 6.0.4
Applications and game engines bundling vulnerable Assimp builds
3D content pipelines that accept untrusted ASE files

Discovery Timeline

2026-06-01 - CVE-2026-10232 published to NVD
2026-06-01 - Last updated in NVD database

Technical Details for CVE-2026-10232

Vulnerability Analysis

The vulnerability is a use-after-free condition classified under [CWE-119] (Improper Restriction of Operations within the Bounds of a Memory Buffer). The defect lives in the aiNode::~aiNode destructor declared in scene.cpp. During teardown of a scene graph produced by the ASE file parser, the destructor accesses node memory that has already been released. Because Assimp is widely embedded as a static or dynamic library inside larger host applications, the corrupted heap state belongs to the consuming process. The attack vector is local: a user must open or load a crafted ASE file through an Assimp-backed importer. Exploit code has been publicly released through the project's issue tracker, making weaponization trivial for attackers targeting 3D content workflows.

Root Cause

The root cause is improper ownership tracking of child node pointers during scene destruction. When the ASE parser produces malformed hierarchy data, the aiNode destructor frees memory and then re-references the same pointer, producing a dangling read or write. Heap layout at the moment of free determines whether the corruption results in process termination or controlled memory reuse.

Attack Vector

Exploitation requires the victim to load an attacker-supplied ASE file with a vulnerable Assimp build. Delivery channels include shared 3D assets in modding ecosystems, asset marketplaces, collaborative content pipelines, and downloads from untrusted sources. The vulnerability is not remotely reachable over a network without user interaction with the malicious file.

No verified exploit code is reproduced here. Technical detail is available in GitHub Issue #6617 and the public proof-of-concept archive.

Detection Methods for CVE-2026-10232

Indicators of Compromise

Unexpected crashes or heap corruption reports in processes that load .ase files through Assimp
Presence of unsolicited or attacker-supplied .ase files in shared asset directories
Stack traces referencing aiNode::~aiNode or scene.cpp during process termination

Detection Strategies

Inventory applications that ship Assimp and verify the linked version against 6.0.4 or earlier
Enable AddressSanitizer or heap-tagging in development and QA builds to surface the use-after-free deterministically
Hash and quarantine ASE files originating from untrusted sources before they reach Assimp-backed importers

Monitoring Recommendations

Alert on repeated crashes of 3D content tools, game clients, or CAD applications correlated with ASE file loads
Log file-open events for .ase extensions on developer workstations and asset build servers
Monitor the Assimp GitHub repository for upstream fixes and release tags

How to Mitigate CVE-2026-10232

Immediate Actions Required

Identify every internal and third-party product that statically or dynamically links Assimp 6.0.4 or earlier
Restrict ASE file imports to trusted sources until a patched Assimp release is integrated
Run Assimp-based importers under reduced privileges or in sandboxed processes to contain memory corruption

Patch Information

At the time of publication, no fixed Assimp release is listed in the NVD entry. Track the upstream GitHub Issue #6617 and the Assimp repository for the corrective commit. Once a patched version is published, rebuild and redistribute any dependent applications. Refer to the VulDB entry for CVE-2026-10232 for additional tracking metadata.

Workarounds

Disable the ASE importer at Assimp build time by excluding the ASE loader from the enabled format list
Validate or strip untrusted ASE files using an isolated preprocessing service before passing them to production importers
Enforce operating-system mitigations such as ASLR, DEP, and heap hardening on hosts that process untrusted 3D assets

bash

# Disable the ASE importer when building Assimp from source
cmake -DASSIMP_BUILD_ALL_IMPORTERS_BY_DEFAULT=OFF \
      -DASSIMP_BUILD_OBJ_IMPORTER=ON \
      -DASSIMP_BUILD_FBX_IMPORTER=ON \
      -DASSIMP_BUILD_ASE_IMPORTER=OFF \
      ..
make -j$(nproc)