Description
A vulnerability classified as problematic was found in Open Asset Import Library Assimp 5.4.3. This vulnerability affects the function MDLImporter::InternReadFile_Quake1 of the file code/AssetLib/MDL/MDLLoader.cpp. The manipulation of the argument skinwidth/skinheight leads to divide by zero. The attack can be initiated remotely. The exploit has been disclosed to the public and may be used. The patch is identified as ab66a1674fcfac87aaba4c8b900b315ebc3e7dbd. It is recommended to apply a patch to fix this issue.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Open Asset Import Library | Assimp | 5.4.3 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | assimp | 6.0.2+ds-1 | — |
| Debian 13 | assimp | No fix yet | — |
| Debian 12 | assimp | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | assimp | No fix yet | — |
| Ubuntu 26.04 LTS | assimp | No fix yet | — |
| Ubuntu 25.10 | assimp | No fix yet | — |
| Ubuntu 24.04 LTS | assimp | No fix yet | — |
| Ubuntu 22.04 LTS | assimp | No fix yet | — |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | assimp | No fix yet | — |
| Ubuntu 18.04 LTS | assimp | No fix yet | — |
| Ubuntu 16.04 LTS | assimp | No fix yet | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SUSE Package Hub 15 SP6 | assimp | 5.3.1-bp156.3.9.1 | openSUSE-SU-2025:0113-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | assimp | 5.4.3-5.1 | openSUSE-SU-2025:14950-1 |
| openSUSE Leap 15.6 | assimp | 5.3.1-bp156.3.9.1 | openSUSE-SU-2025:0113-1 |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| PyPI | pyassimp | <= 5.4.3 | — | PYSEC-2025-160 |
Advisories 2
- openSUSE-SU-2025:0113-1 Security update for assimp SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2025:14950-1 assimp-devel-5.4.3-5.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
References
- VDB-300574 | Open Asset Import Library Assimp MDLLoader.cpp InternReadFile_Quake1 divide by zero vdb-entry technical-description
- VDB-300574 | CTI Indicators (IOB, IOC, TTP, IOA) signature permissions-required
- Submit #517781 | Open Asset Import Library Assimp >=5.4.3 Divide By Zero third-party-advisory
- https://github.com/assimp/assimp/issues/6009 issue-tracking
- https://github.com/assimp/assimp/pull/6047 issue-tracking
- https://github.com/assimp/assimp/issues/6009#issue-2877367021 exploit issue-tracking
- https://github.com/assimp/assimp/pull/6047/commits/ab66a1674fcfac87aaba4c8b900b315ebc3e7dbd issue-tracking patch