CVE-2025-6120 Open Asset Import Library Assimp HL1MDLLoader.cpp read_meshes heap-based overflow
A heap-based buffer overflow in Assimp's HL1MDL loader allows local attackers to execute arbitrary code or cause denial of service via malicious files.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-6120?
CVE-2025-6120 is a medium-severity memory corruption vulnerability in Open Asset Import Library Assimp, published on 16 Jun 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A vulnerability classified as critical was found in Open Asset Import Library Assimp up to 5.4.3. Affected by this vulnerability is the function read_meshes in the library assimp/code/AssetLib/MDL/HalfLife/HL1MDLLoader.cpp. The manipulation leads to heap-based buffer overflow. It is possible to launch the attack on the local host. The exploit has been disclosed to the public and may be used. The project decided to collect all Fuzzer bugs in a main-issue to address them in the future.
Which versions are affected by CVE-2025-6120?
It affects 1 product.
Products include Assimp Assimp.
How do I fix CVE-2025-6120?
No fix published yet.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2025-6120 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-6120 exists.
Other vulnerabilities in Open Asset Import Library Assimp
Sources
Also known as DEBIAN-CVE-2025-6120, GHSA-wg5q-7rhh-29w7, JLSEC-2026-197, UBUNTU-CVE-2025-6120.