CVE-2025-5166 Open Asset Import Library Assimp MDC File Parser MDCLoader.cpp InternReadFile out-of-bounds
An out-of-bounds read in the Assimp library's MDC file parser allows local attackers to cause denial of service or disclose memory contents.
- 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-2025-5166?
CVE-2025-5166 is a medium-severity memory corruption vulnerability in Open Asset Import Library Assimp, published on 26 May 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A vulnerability was found in Open Asset Import Library Assimp 5.4.3. It has been classified as problematic. Affected is the function MDCImporter::InternReadFile of the file assimp/code/AssetLib/MDC/MDCLoader.cpp of the component MDC File Parser. The manipulation of the argument pcVerts leads to out-of-bounds read. 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-2025-5166?
1 open source package ship an affected version, including pyassimp. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
pyassimp PyPI | All versions to 5.4.3 | None |
Products include Assimp Assimp.
How do I fix CVE-2025-5166?
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-2025-5166 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-5166 exists.
Other vulnerabilities in Open Asset Import Library Assimp
Sources
Also known as DEBIAN-CVE-2025-5166, GHSA-jg2v-6g6x-hx35, OESA-2026-1214, OESA-2026-1215, OESA-2026-1216, OESA-2026-1217 and 2 more.