# CVE-2026-82591: Open Asset Import Library Assimp heap buffer overflow in MD5Importer

Source: https://junglewise.ai/threats/cve-2026-82591-open-asset-import-library-assimp-heap-buffer-overflow-in  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-08-30. Updated: 2026-09-25  
License: CC BY 4.0 with a link back

CVE-2026-82591 · Severity: medium · CVSS 5.3 · Published 2026-08-30

Assimp is a widely-used library for importing and processing 3D model files across games and design software. A heap buffer overflow in the MD5 file parser allows a local attacker to crash the application or potentially execute code by providing a malicious MD5 model file, impacting any application using the vulnerable library version.

Technologies: [Assimp Open Asset Import Library](https://junglewise.ai/threats/technologies/open-asset-import-library). Vendors: [Assimp](https://junglewise.ai/threats/vendors/assimp).

## Quick answers

**Is CVE-2026-82591 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-82591 being exploited in the wild.

**How severe is CVE-2026-82591?** Medium severity, with a CVSS score of 5.3, published 30 August 2026.

**Which products and versions are affected?** Assimp Open Asset Import Library up to 6.0.2.

**Is there a fix for CVE-2026-82591?** A patch was published on 2026-08-04: Fix merged in upstream repository Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-82591 attacked?** It is attacked with local access, in a software library.

**Am I affected by CVE-2026-82591?** Check whether you run Assimp Open Asset Import Library at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A heap-based buffer overflow exists in the MD5Importer::MakeDataUnique function in code/AssetLib/MD5/MD5Loader.cpp, triggered by improper handling of the iNewIndex argument during memory manipulation. The vulnerability requires local access and a specially crafted MD5 model file to trigger. An attacker can cause a heap buffer overflow write, leading to application crash (denial of service) or potential code execution depending on heap layout. A patch has been identified (commit bf9dabb617c46e5133dac65cca6bff177917afcb) and is available in the upstream repository.

## Affected products

- Assimp Open Asset Import Library up to 6.0.2

## Timeline

- 2026-08-30: disclosed
- 2026-08-04: patched: Fix merged in upstream repository

## References

- [https://github.com/assimp/assimp/commit/bf9dabb617c46e5133dac65cca6bff177917afcb](https://github.com/assimp/assimp/commit/bf9dabb617c46e5133dac65cca6bff177917afcb)
- [https://github.com/assimp/assimp/pull/6718](https://github.com/assimp/assimp/pull/6718)

## Related threats

- [Open Asset Import Library heap buffer overflow in decompressBlock](https://junglewise.ai/threats/cve-2026-19967-open-asset-import-library-heap-buffer-overflow-in-decompressblock)
- [Open Asset Import Library Assimp double free in PLY Model Handler](https://junglewise.ai/threats/cve-2026-14604-open-asset-import-library-assimp-double-free-in-ply-model-handler)